diff --git a/Cargo.toml b/Cargo.toml
index c749341..48892f9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,10 @@ clap = { version = "4.5.42", features = ["derive"] , optional = true}
 tokio = { version = "1", features = ["macros", "net", "rt", "rt-multi-thread", "io-util", "sync"], optional = true}
 
 [dev-dependencies]
+hex = "0.4.3"
 rand = {version = "0.9.2"}
+serde = { version = "1.0.228", features = ["derive"] }
+serde_json = "1.0.145"
 
 [[bin]]
 name = "beb"
diff --git a/src/ll.rs b/src/ll.rs
index b3672e4..6f64f38 100644
--- a/src/ll.rs
+++ b/src/ll.rs
@@ -176,12 +176,23 @@ pub fn individual_secrets(secret: &sha256::Hash, keys: &[[u8; 33]]) -> Vec<[u8;
 
 pub fn inner_encrypt(
     secret: sha256::Hash,
-    mut data: Vec<u8>,
+    data: Vec<u8>,
     #[cfg(not(feature = "rand"))] nonce: [u8; 12],
 ) -> Result<([u8; 12], Vec<u8>), Error> {
     #[cfg(feature = "rand")]
     let nonce = nonce();
 
+    encrypt_with_nonce(secret, data, nonce)
+}
+
+pub fn encrypt_with_nonce(
+    secret: sha256::Hash,
+    mut data: Vec<u8>,
+    nonce: [u8; 12],
+) -> Result<([u8; 12], Vec<u8>), Error> {
+    if data.is_empty() {
+        return Err(Error::EmptyBytes);
+    }
     #[allow(deprecated)]
     let key = Key::<Aes256Gcm>::from_slice(secret.as_byte_array());
     let cipher = Aes256Gcm::new(key);
@@ -370,12 +381,12 @@ pub fn decode_v1(
     ))
 }
 
-pub fn encrypt_aes_gcm_256_v1(
+fn encrypt_aes_gcm_256_v1_with_nonce(
     derivation_paths: Vec<DerivationPath>,
     content_metadata: Content,
     keys: Vec<secp256k1::PublicKey>,
     data: &[u8],
-    #[cfg(not(feature = "rand"))] nonce: [u8; 12],
+    nonce: [u8; 12],
 ) -> Result<Vec<u8>, Error> {
     // drop duplicates keys and sort out bip341 nums
     let keys = keys
@@ -424,12 +435,7 @@ pub fn encrypt_aes_gcm_256_v1(
     let mut payload = content_metadata;
     payload.append(&mut data.to_vec());
 
-    let (nonce, cyphertext) = inner_encrypt(
-        secret,
-        payload.to_vec(),
-        #[cfg(not(feature = "rand"))]
-        nonce,
-    )?;
+    let (nonce, cyphertext) = encrypt_with_nonce(secret, payload.to_vec(), nonce)?;
     let encrypted_payload = encode_encrypted_payload(nonce, cyphertext.as_slice())?;
 
     Ok(encode_v1(
@@ -441,6 +447,18 @@ pub fn encrypt_aes_gcm_256_v1(
     ))
 }
 
+pub fn encrypt_aes_gcm_256_v1(
+    derivation_paths: Vec<DerivationPath>,
+    content_metadata: Content,
+    keys: Vec<secp256k1::PublicKey>,
+    data: &[u8],
+    #[cfg(not(feature = "rand"))] nonce: [u8; 12],
+) -> Result<Vec<u8>, Error> {
+    #[cfg(feature = "rand")]
+    let nonce = nonce();
+    encrypt_aes_gcm_256_v1_with_nonce(derivation_paths, content_metadata, keys, data, nonce)
+}
+
 pub fn try_decrypt_aes_gcm_256(
     cyphertext: &[u8],
     secret: &[u8; 32],
@@ -1228,3 +1246,470 @@ mod tests {
         assert!(fails.is_none());
     }
 }
+
+#[cfg(all(test, feature = "rand"))]
+mod derivation_paths {
+    use super::*;
+    use alloc::{string::String, vec::Vec};
+    use core::str::FromStr;
+    use miniscript::bitcoin::bip32::DerivationPath;
+
+    const TEST_VECTORS_JSON: &str = include_str!("../test_vectors/derivation_path.json");
+
+    #[derive(serde::Deserialize)]
+    struct TestVector {
+        description: String,
+        paths: Vec<String>,
+        expected: Option<String>,
+    }
+
+    #[test]
+    fn test_vector_derivation_path_ser_deser() {
+        let vectors: Vec<TestVector> = serde_json::from_str(TEST_VECTORS_JSON).unwrap();
+
+        let mut cases: Vec<(
+            Vec<DerivationPath>,
+            Option<Vec<u8>>,
+            String, /* description */
+        )> = vec![];
+        for v in vectors {
+            let p = v
+                .paths
+                .into_iter()
+                .map(|s| DerivationPath::from_str(&s).unwrap())
+                .collect();
+            let ser: Option<Vec<u8>> = v
+                .expected
+                .map(|hex_str| hex::decode(hex_str).expect(&v.description));
+            cases.push((p, ser, v.description));
+        }
+
+        for (paths, expected, description) in cases {
+            // serialize
+            let result = encode_derivation_paths(paths.clone()).ok();
+            if result != expected {
+                panic!("Derivation path serialization failed: {description}");
+            }
+
+            // deserialize
+            if let Some(serialized) = expected {
+                let (_, paths2) = parse_derivation_paths(&serialized).expect(&description);
+                if paths != paths2 {
+                    panic!("Derivation path deserialization failed: {description}");
+                }
+            }
+        }
+    }
+}
+
+#[cfg(all(test, feature = "rand"))]
+mod individual_secrets_vectors {
+    use super::*;
+    use alloc::{string::String, vec::Vec};
+
+    const TEST_VECTORS_JSON: &str = include_str!("../test_vectors/individual_secrets.json");
+
+    #[derive(serde::Deserialize)]
+    struct TestVector {
+        description: String,
+        secrets: Vec<String>,
+        expected: Option<String>,
+    }
+
+    #[test]
+    #[allow(clippy::type_complexity)]
+    fn test_vector_individual_secrets_ser_deser() {
+        let vectors: Vec<TestVector> = serde_json::from_str(TEST_VECTORS_JSON).unwrap();
+
+        let mut cases: Vec<(
+            Vec<[u8; 32]>,
+            Option<Vec<u8>>,
+            String, /* description */
+        )> = vec![];
+
+        for v in vectors {
+            let secrets = v
+                .secrets
+                .into_iter()
+                .map(|hex_str| {
+                    let bytes = hex::decode(hex_str).expect(&v.description);
+                    let arr: [u8; 32] = bytes.try_into().expect("secret must be 32 bytes");
+                    arr
+                })
+                .collect();
+            let ser: Option<Vec<u8>> = v
+                .expected
+                .map(|hex_str| hex::decode(hex_str).expect(&v.description));
+            cases.push((secrets, ser, v.description));
+        }
+
+        for (mut secrets, expected, description) in cases {
+            // serialize
+            let result = encode_individual_secrets(&secrets).ok();
+            if result != expected {
+                panic!("Individual secrets serialization failed: {description}");
+            }
+
+            // deserialize
+            if let Some(exp) = expected {
+                let (_, mut parsed) = parse_individual_secrets(&exp).expect(&description);
+                secrets.sort();
+                parsed.sort();
+
+                if secrets != parsed {
+                    panic!("Individual secrets deserialization failed: {description}");
+                }
+            }
+        }
+    }
+}
+
+#[cfg(all(test, feature = "rand"))]
+mod encryption_secret {
+    use super::*;
+    use alloc::{string::String, vec::Vec};
+    use core::str::FromStr;
+
+    const TEST_VECTORS_JSON: &str = include_str!("../test_vectors/encryption_secret.json");
+
+    #[derive(serde::Deserialize)]
+    struct TestVector {
+        description: String,
+        keys: Vec<String>,
+        decryption_secret: String,
+        individual_secrets: Vec<String>,
+    }
+
+    #[test]
+    fn test_vector_encryption_secret() {
+        let vectors: Vec<TestVector> = serde_json::from_str(TEST_VECTORS_JSON).unwrap();
+
+        for v in vectors {
+            let description = &v.description;
+
+            // Parse public keys
+            let keys: Vec<secp256k1::PublicKey> = v
+                .keys
+                .iter()
+                .map(|hex_str| secp256k1::PublicKey::from_str(hex_str).expect(description))
+                .collect();
+
+            // Convert to raw bytes and sort
+            let mut raw_keys: Vec<[u8; 33]> = keys.iter().map(|k| k.serialize()).collect();
+            raw_keys.sort();
+            raw_keys.dedup();
+
+            // Parse expected decryption secret
+            let expected_decryption_secret = hex::decode(&v.decryption_secret).expect(description);
+            let expected_decryption_secret: [u8; 32] = expected_decryption_secret
+                .try_into()
+                .expect("decryption secret must be 32 bytes");
+
+            // Parse expected individual secrets
+            let expected_individual_secrets: Vec<[u8; 32]> = v
+                .individual_secrets
+                .iter()
+                .map(|hex_str| {
+                    let bytes = hex::decode(hex_str).expect(description);
+                    let arr: [u8; 32] = bytes
+                        .try_into()
+                        .expect("individual secret must be 32 bytes");
+                    arr
+                })
+                .collect();
+
+            // Test decryption_secret generation
+            let computed_decryption_secret = decryption_secret(&raw_keys);
+            assert_eq!(
+                computed_decryption_secret.as_byte_array(),
+                &expected_decryption_secret,
+                "Decryption secret mismatch: {}",
+                description
+            );
+
+            // Test individual_secrets generation
+            let computed_individual_secrets =
+                individual_secrets(&computed_decryption_secret, &raw_keys);
+            assert_eq!(
+                computed_individual_secrets.len(),
+                expected_individual_secrets.len(),
+                "Individual secrets count mismatch: {}",
+                description
+            );
+
+            for (i, (computed, expected)) in computed_individual_secrets
+                .iter()
+                .zip(expected_individual_secrets.iter())
+                .enumerate()
+            {
+                assert_eq!(
+                    computed, expected,
+                    "Individual secret {} mismatch: {}",
+                    i, description
+                );
+            }
+
+            // Test round-trip: recover decryption secret from individual secrets
+            for (i, raw_key) in raw_keys.iter().enumerate() {
+                let individual_sec = computed_individual_secrets[i];
+
+                // Compute Si = SHA256("BEB_BACKUP_INDIVIDUAL_SECRET" || key)
+                let mut engine = sha256::HashEngine::default();
+                engine.input(INDIVIDUAL_SECRET.as_bytes());
+                engine.input(raw_key);
+                let si = sha256::Hash::from_engine(engine);
+
+                // Recover secret: S = Ci XOR Si
+                let recovered_secret = xor(&individual_sec, si.as_byte_array());
+
+                assert_eq!(
+                    recovered_secret, expected_decryption_secret,
+                    "Round-trip recovery failed for key {}: {}",
+                    i, description
+                );
+            }
+        }
+    }
+}
+
+#[cfg(all(test, feature = "rand"))]
+mod encryption_vectors {
+    use super::*;
+    use alloc::{string::String, vec::Vec};
+
+    const TEST_VECTORS_JSON: &str = include_str!("../test_vectors/aesgcm256_encryption.json");
+
+    #[derive(serde::Deserialize)]
+    struct TestVector {
+        description: String,
+        nonce: String,
+        plaintext: String,
+        secret: String,
+        ciphertext: Option<String>,
+    }
+
+    #[test]
+    fn test_vector_aesgcm256_encryption() {
+        let vectors: Vec<TestVector> = serde_json::from_str(TEST_VECTORS_JSON).unwrap();
+
+        for v in vectors {
+            let description = &v.description;
+
+            // Parse inputs
+            let nonce_bytes = hex::decode(&v.nonce).expect(description);
+            let nonce: [u8; 12] = nonce_bytes.try_into().expect("nonce must be 12 bytes");
+
+            let secret_bytes = hex::decode(&v.secret).expect(description);
+            let secret: [u8; 32] = secret_bytes.try_into().expect("secret must be 32 bytes");
+            let secret_hash = sha256::Hash::from_byte_array(secret);
+
+            let plaintext = if v.plaintext.is_empty() {
+                vec![]
+            } else {
+                hex::decode(&v.plaintext).expect(description)
+            };
+
+            if let Some(expected_ciphertext_hex) = v.ciphertext {
+                // Expected to succeed
+                let expected_ciphertext = hex::decode(&expected_ciphertext_hex).expect(description);
+
+                // Test encryption
+                let (_, computed_ciphertext) =
+                    encrypt_with_nonce(secret_hash, plaintext.clone(), nonce).expect(description);
+
+                assert_eq!(
+                    computed_ciphertext, expected_ciphertext,
+                    "Ciphertext mismatch: {}",
+                    description
+                );
+
+                // Test decryption
+                let decrypted = try_decrypt_aes_gcm_256(&computed_ciphertext, &secret, nonce)
+                    .expect(description);
+
+                assert_eq!(decrypted, plaintext, "Decryption failed: {}", description);
+            } else {
+                // Expected to fail
+                let result = encrypt_with_nonce(secret_hash, plaintext, nonce);
+                assert!(
+                    result.is_err(),
+                    "Encryption should have failed: {}",
+                    description
+                );
+            }
+        }
+    }
+}
+
+#[cfg(all(test, feature = "rand"))]
+mod encrypted_backup {
+    use super::*;
+    use alloc::{string::String, vec::Vec};
+    use core::str::FromStr;
+
+    const TEST_VECTORS_JSON: &str = include_str!("../test_vectors/encrypted_backup.json");
+
+    #[derive(serde::Deserialize)]
+    struct TestVector {
+        description: String,
+        version: u8,
+        encryption: u8,
+        content: String,
+        keys: Vec<String>,
+        derivation_paths: Vec<String>,
+        plaintext: String,
+        nonce: String,
+        expected: String,
+    }
+
+    #[test]
+    fn test_vector_encrypted_backup() {
+        let vectors: Vec<TestVector> = serde_json::from_str(TEST_VECTORS_JSON).unwrap();
+
+        for v in vectors {
+            let description = &v.description;
+
+            // Parse content metadata from hex
+            let content_bytes = hex::decode(&v.content).expect(description);
+            let (_, content) = parse_content_metadata(&content_bytes)
+                .ok()
+                .unwrap_or_else(|| panic!("Failed to parse content for: {}", description));
+
+            let keys: Vec<secp256k1::PublicKey> = v
+                .keys
+                .iter()
+                .map(|s| secp256k1::PublicKey::from_str(s).expect(description))
+                .collect();
+
+            let mut derivation_paths: Vec<DerivationPath> = v
+                .derivation_paths
+                .iter()
+                .map(|s| DerivationPath::from_str(s).expect(description))
+                .collect();
+
+            let plaintext = v.plaintext;
+
+            let nonce_bytes = hex::decode(&v.nonce).expect(description);
+            let nonce: [u8; 12] = nonce_bytes.try_into().expect("nonce must be 12 bytes");
+
+            let expected_bytes = hex::decode(&v.expected).expect(description);
+
+            // Test encryption
+            let encrypted = encrypt_aes_gcm_256_v1_with_nonce(
+                derivation_paths.clone(),
+                content.clone(),
+                keys.clone(),
+                plaintext.as_bytes(),
+                nonce,
+            )
+            .expect(description);
+
+            assert_eq!(
+                encrypted, expected_bytes,
+                "Encrypted payload mismatch: {}",
+                description
+            );
+
+            // Test decryption
+            let version = decode_version(&encrypted).expect(description);
+            assert_eq!(version, v.version, "Version mismatch: {}", description);
+
+            let mut parsed_derivation_paths =
+                decode_derivation_paths(&encrypted).expect(description);
+
+            parsed_derivation_paths.sort();
+            derivation_paths.sort();
+            assert_eq!(
+                parsed_derivation_paths, derivation_paths,
+                "Derivation paths mismatch: {}",
+                description
+            );
+
+            let (_, individual_secrets, encryption_type, parsed_nonce, cyphertext) =
+                decode_v1(&encrypted).expect(description);
+
+            assert_eq!(
+                encryption_type, v.encryption,
+                "Encryption type mismatch: {}",
+                description
+            );
+            assert_eq!(parsed_nonce, nonce, "Nonce mismatch: {}", description);
+
+            // Test decryption with each key
+            for key in &keys {
+                let (decrypted_content, decrypted_plaintext) = decrypt_aes_gcm_256_v1(
+                    *key,
+                    &individual_secrets,
+                    cyphertext.clone(),
+                    parsed_nonce,
+                )
+                .expect(description);
+
+                let decrypted_plaintext = String::from_utf8(decrypted_plaintext).unwrap();
+
+                assert_eq!(
+                    decrypted_content, content,
+                    "Content metadata mismatch: {}",
+                    description
+                );
+                assert_eq!(
+                    decrypted_plaintext, plaintext,
+                    "Decrypted plaintext mismatch: {}",
+                    description
+                );
+            }
+        }
+    }
+}
+
+#[cfg(all(test, feature = "rand"))]
+mod content_vectors {
+    use super::*;
+    use alloc::{
+        string::{String, ToString},
+        vec::Vec,
+    };
+
+    const TEST_VECTORS_JSON: &str = include_str!("../test_vectors/content_type.json");
+
+    #[derive(serde::Deserialize, serde::Serialize)]
+
+    struct TestVector {
+        description: String,
+        valid: bool,
+        content: String,
+    }
+
+    #[test]
+    fn test_vector_content() {
+        let vectors: Vec<TestVector> = serde_json::from_str(TEST_VECTORS_JSON).unwrap();
+
+        let mut parsed = vec![];
+        for v in vectors {
+            let content = hex::decode(&v.content).expect(&v.description);
+            match parse_content_metadata(&content) {
+                Ok((_, content)) => {
+                    assert!(v.valid);
+                    parsed.push((content, v.description.to_string()));
+                }
+                Err(_) => assert!(!v.valid),
+            }
+        }
+
+        let expected = vec![
+            (Content::None, "None".to_string()),
+            (Content::Bip380, "Bip 380".to_string()),
+            (Content::Bip388, "Bip 388".to_string()),
+            (Content::Bip329, "Bip 329".to_string()),
+            (Content::BIP(999), "Bip 999".to_string()),
+            (Content::BIP(65535), "Bip max".to_string()),
+            (Content::BIP(0), "Bip min".to_string()),
+            (
+                Content::Proprietary(vec![0x00, 0x01, 0x02, 0x03]),
+                "Propietary 00010203".to_string(),
+            ),
+        ];
+
+        assert_eq!(parsed, expected);
+    }
+}
diff --git a/test_vectors/aesgcm256_encryption.json b/test_vectors/aesgcm256_encryption.json
new file mode 100644
index 0000000..1b27e99
--- /dev/null
+++ b/test_vectors/aesgcm256_encryption.json
@@ -0,0 +1,39 @@
+[
+  {
+    "description": "Basic encryption with short plaintext",
+    "nonce": "000102030405060708090a0b",
+    "plaintext": "48656c6c6f",
+    "secret": "0000000000000000000000000000000000000000000000000000000000000000",
+    "ciphertext": "c0ae5f3e6f609000697cc7c8de2b30ce8817ca44fa"
+  },
+  {
+    "description": "Empty plaintext should fail",
+    "nonce": "000102030405060708090a0b",
+    "plaintext": "",
+    "secret": "0000000000000000000000000000000000000000000000000000000000000000",
+    "ciphertext": null
+  },
+  {
+    "description": "Encryption with all zeros",
+    "nonce": "000000000000000000000000",
+    "plaintext": "00000000000000000000000000000000",
+    "secret": "0000000000000000000000000000000000000000000000000000000000000000",
+    "ciphertext": "cea7403d4d606b6e074ec5d3baf39d18d0d1c8a799996bf0265b98b5d48ab919"
+  },
+  {
+    "description": "Encryption with all FFs",
+    "nonce": "ffffffffffffffffffffffff",
+    "plaintext": "ffffffffffffffffffffffffffffffff",
+    "secret": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+    "ciphertext": "42c4417ae76f276beb09973a4b9b37155b3f5fe9af300dd8d2372023367d86b7"
+  },
+  {
+    "description": "Longer plaintext",
+    "nonce": "0f1e2d3c4b5a69788796a5b4",
+    "plaintext": "546869732069732061206c6f6e67657220706c61696e746578742074686174207368756c6420626520656e637279707465642070726f7065726c792e",
+    "secret": "deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef",
+    "ciphertext": "ea2e3d6ac4724e3301f138b449495b9eed1f01207eb5f62d1c0e103f2237a8e459b1770a8c7b8eabf2d69922e5f767ad4de4d8d7bf737e49dd6fef6d7996158207af0edd60e87faf8a353d7c"
+  }
+]
+
+
diff --git a/test_vectors/content_type.json b/test_vectors/content_type.json
new file mode 100644
index 0000000..d76195f
--- /dev/null
+++ b/test_vectors/content_type.json
@@ -0,0 +1,77 @@
+[
+  {
+    "description": "None",
+    "valid": true,
+    "content": "00"
+  },
+  {
+    "description": "Bip 380",
+    "valid": true,
+    "content": "02017c"
+  },
+  {
+    "description": "Bip 388",
+    "valid": true,
+    "content": "020184"
+  },
+  {
+    "description": "Bip 329",
+    "valid": true,
+    "content": "020149"
+  },
+  {
+    "description": "Bip 999",
+    "valid": true,
+    "content": "0203e7"
+  },
+  {
+    "description": "Bip max",
+    "valid": true,
+    "content": "02ffff"
+  },
+  {
+    "description": "Bip min",
+    "valid": true,
+    "content": "020000"
+  },
+  {
+    "description": "Propietary 00010203",
+    "valid": true,
+    "content": "0400010203"
+  },
+  {
+    "description": "Invalid BIP",
+    "valid": false,
+    "content": "0200"
+  },
+  {
+    "description": "Invalid proprietary",
+    "valid": false,
+    "content": "0300"
+  },
+  {
+    "description": "Invalid proprietary",
+    "valid": false,
+    "content": "030000"
+  },
+  {
+    "description": "Starting with 0xFF is reserved",
+    "valid": false,
+    "content": "ff"
+  },
+  {
+    "description": "Starting with 0xFF is reserved",
+    "valid": false,
+    "content": "ff000000"
+  },
+  {
+    "description": "Starting with 0x01 is invalid",
+    "valid": false,
+    "content": "01"
+  },
+  {
+    "description": "Starting with 0x01 is invalid",
+    "valid": false,
+    "content": "0100"
+  }
+]
diff --git a/test_vectors/derivation_path.json b/test_vectors/derivation_path.json
new file mode 100644
index 0000000..2ce20db
--- /dev/null
+++ b/test_vectors/derivation_path.json
@@ -0,0 +1,141 @@
+[
+  {
+    "description": "Empty derivation paths",
+    "paths": [],
+    "expected": "00"
+  },
+  {
+    "description": "Single path with one child: m/0",
+    "paths": ["m/0"],
+    "expected": "010100000000"
+  },
+  {
+    "description": "Single path with hardened child: m/44'",
+    "paths": ["m/44'"],
+    "expected": "01018000002c"
+  },
+  {
+    "description": "Standard BIP-84 path: m/84'/0'/0'",
+    "paths": ["m/84'/0'/0'"],
+    "expected": "0103800000548000000080000000"
+  },
+  {
+    "description": "Mixed hardened and normal: m/0/1'/2/3'",
+    "paths": ["m/0/1'/2/3'"],
+    "expected": "010400000000800000010000000280000003"
+  },
+  {
+    "description": "Multiple paths: m/0/1'/2/3' and m/84'/0'/0'/2'",
+    "paths": ["m/0/1'/2/3'", "m/84'/0'/0'/2'"],
+    "expected": "0204000000008000000100000002800000030480000054800000008000000080000002"
+  },
+  {
+    "description": "Path with large indices: m/2147483647'/2147483646",
+    "paths": ["m/2147483647'/2147483646"],
+    "expected": "0102ffffffff7ffffffe"
+  },
+  {
+    "description": "Single child path: m/1",
+    "paths": ["m/1"],
+    "expected": "010100000001"
+  },
+  {
+    "description": "Path with max normal index: m/2147483647",
+    "paths": ["m/2147483647"],
+    "expected": "01017fffffff"
+  },
+  {
+    "description": "Path with multiple normal indices: m/0/1/2/3/4",
+    "paths": ["m/0/1/2/3/4"],
+    "expected": "01050000000000000001000000020000000300000004"
+  },
+  {
+    "description": "Path with all hardened: m/0'/1'/2'",
+    "paths": ["m/0'/1'/2'"],
+    "expected": "0103800000008000000180000002"
+  },
+  {
+    "description": "Two different single-child paths: m/0 and m/1",
+    "paths": ["m/0", "m/1"],
+    "expected": "0201000000000100000001"
+  },
+  {
+    "description": "BIP-44 account 0: m/44'/0'/0'",
+    "paths": ["m/44'/0'/0'"],
+    "expected": "01038000002c8000000080000000"
+  },
+  {
+    "description": "BIP-49 account 0: m/49'/0'/0'",
+    "paths": ["m/49'/0'/0'"],
+    "expected": "0103800000318000000080000000"
+  },
+  {
+    "description": "256 paths should fail (exceeds u8::MAX)",
+    "paths": [
+      "m/0", "m/1", "m/2", "m/3", "m/4", "m/5", "m/6", "m/7", "m/8", "m/9",
+      "m/10", "m/11", "m/12", "m/13", "m/14", "m/15", "m/16", "m/17", "m/18", "m/19",
+      "m/20", "m/21", "m/22", "m/23", "m/24", "m/25", "m/26", "m/27", "m/28", "m/29",
+      "m/30", "m/31", "m/32", "m/33", "m/34", "m/35", "m/36", "m/37", "m/38", "m/39",
+      "m/40", "m/41", "m/42", "m/43", "m/44", "m/45", "m/46", "m/47", "m/48", "m/49",
+      "m/50", "m/51", "m/52", "m/53", "m/54", "m/55", "m/56", "m/57", "m/58", "m/59",
+      "m/60", "m/61", "m/62", "m/63", "m/64", "m/65", "m/66", "m/67", "m/68", "m/69",
+      "m/70", "m/71", "m/72", "m/73", "m/74", "m/75", "m/76", "m/77", "m/78", "m/79",
+      "m/80", "m/81", "m/82", "m/83", "m/84", "m/85", "m/86", "m/87", "m/88", "m/89",
+      "m/90", "m/91", "m/92", "m/93", "m/94", "m/95", "m/96", "m/97", "m/98", "m/99",
+      "m/100", "m/101", "m/102", "m/103", "m/104", "m/105", "m/106", "m/107", "m/108", "m/109",
+      "m/110", "m/111", "m/112", "m/113", "m/114", "m/115", "m/116", "m/117", "m/118", "m/119",
+      "m/120", "m/121", "m/122", "m/123", "m/124", "m/125", "m/126", "m/127", "m/128", "m/129",
+      "m/130", "m/131", "m/132", "m/133", "m/134", "m/135", "m/136", "m/137", "m/138", "m/139",
+      "m/140", "m/141", "m/142", "m/143", "m/144", "m/145", "m/146", "m/147", "m/148", "m/149",
+      "m/150", "m/151", "m/152", "m/153", "m/154", "m/155", "m/156", "m/157", "m/158", "m/159",
+      "m/160", "m/161", "m/162", "m/163", "m/164", "m/165", "m/166", "m/167", "m/168", "m/169",
+      "m/170", "m/171", "m/172", "m/173", "m/174", "m/175", "m/176", "m/177", "m/178", "m/179",
+      "m/180", "m/181", "m/182", "m/183", "m/184", "m/185", "m/186", "m/187", "m/188", "m/189",
+      "m/190", "m/191", "m/192", "m/193", "m/194", "m/195", "m/196", "m/197", "m/198", "m/199",
+      "m/200", "m/201", "m/202", "m/203", "m/204", "m/205", "m/206", "m/207", "m/208", "m/209",
+      "m/210", "m/211", "m/212", "m/213", "m/214", "m/215", "m/216", "m/217", "m/218", "m/219",
+      "m/220", "m/221", "m/222", "m/223", "m/224", "m/225", "m/226", "m/227", "m/228", "m/229",
+      "m/230", "m/231", "m/232", "m/233", "m/234", "m/235", "m/236", "m/237", "m/238", "m/239",
+      "m/240", "m/241", "m/242", "m/243", "m/244", "m/245", "m/246", "m/247", "m/248", "m/249",
+      "m/250", "m/251", "m/252", "m/253", "m/254", "m/255"
+    ],
+    "expected": null
+  },
+  {
+    "description": "Path with 256 children should fail (exceeds u8::MAX)",
+    "paths": ["m/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0"],
+    "expected": null
+  },
+  {
+    "description": "255 paths should succeed (maximum allowed)",
+    "paths": [
+      "m/0", "m/1", "m/2", "m/3", "m/4", "m/5", "m/6", "m/7", "m/8", "m/9",
+      "m/10", "m/11", "m/12", "m/13", "m/14", "m/15", "m/16", "m/17", "m/18", "m/19",
+      "m/20", "m/21", "m/22", "m/23", "m/24", "m/25", "m/26", "m/27", "m/28", "m/29",
+      "m/30", "m/31", "m/32", "m/33", "m/34", "m/35", "m/36", "m/37", "m/38", "m/39",
+      "m/40", "m/41", "m/42", "m/43", "m/44", "m/45", "m/46", "m/47", "m/48", "m/49",
+      "m/50", "m/51", "m/52", "m/53", "m/54", "m/55", "m/56", "m/57", "m/58", "m/59",
+      "m/60", "m/61", "m/62", "m/63", "m/64", "m/65", "m/66", "m/67", "m/68", "m/69",
+      "m/70", "m/71", "m/72", "m/73", "m/74", "m/75", "m/76", "m/77", "m/78", "m/79",
+      "m/80", "m/81", "m/82", "m/83", "m/84", "m/85", "m/86", "m/87", "m/88", "m/89",
+      "m/90", "m/91", "m/92", "m/93", "m/94", "m/95", "m/96", "m/97", "m/98", "m/99",
+      "m/100", "m/101", "m/102", "m/103", "m/104", "m/105", "m/106", "m/107", "m/108", "m/109",
+      "m/110", "m/111", "m/112", "m/113", "m/114", "m/115", "m/116", "m/117", "m/118", "m/119",
+      "m/120", "m/121", "m/122", "m/123", "m/124", "m/125", "m/126", "m/127", "m/128", "m/129",
+      "m/130", "m/131", "m/132", "m/133", "m/134", "m/135", "m/136", "m/137", "m/138", "m/139",
+      "m/140", "m/141", "m/142", "m/143", "m/144", "m/145", "m/146", "m/147", "m/148", "m/149",
+      "m/150", "m/151", "m/152", "m/153", "m/154", "m/155", "m/156", "m/157", "m/158", "m/159",
+      "m/160", "m/161", "m/162", "m/163", "m/164", "m/165", "m/166", "m/167", "m/168", "m/169",
+      "m/170", "m/171", "m/172", "m/173", "m/174", "m/175", "m/176", "m/177", "m/178", "m/179",
+      "m/180", "m/181", "m/182", "m/183", "m/184", "m/185", "m/186", "m/187", "m/188", "m/189",
+      "m/190", "m/191", "m/192", "m/193", "m/194", "m/195", "m/196", "m/197", "m/198", "m/199",
+      "m/200", "m/201", "m/202", "m/203", "m/204", "m/205", "m/206", "m/207", "m/208", "m/209",
+      "m/210", "m/211", "m/212", "m/213", "m/214", "m/215", "m/216", "m/217", "m/218", "m/219",
+      "m/220", "m/221", "m/222", "m/223", "m/224", "m/225", "m/226", "m/227", "m/228", "m/229",
+      "m/230", "m/231", "m/232", "m/233", "m/234", "m/235", "m/236", "m/237", "m/238", "m/239",
+      "m/240", "m/241", "m/242", "m/243", "m/244", "m/245", "m/246", "m/247", "m/248", "m/249",
+      "m/250", "m/251", "m/252", "m/253", "m/254"
+    ],
+    "expected": "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"
+  }
+]
diff --git a/test_vectors/encrypted_backup.json b/test_vectors/encrypted_backup.json
new file mode 100644
index 0000000..ffe32b7
--- /dev/null
+++ b/test_vectors/encrypted_backup.json
@@ -0,0 +1,57 @@
+[
+  {
+    "description": "Single key, no derivation paths, no content metadata",
+    "version": 1,
+    "encryption": 1,
+    "content": "00",
+    "keys": [
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443"
+    ],
+    "derivation_paths": [],
+    "plaintext": "00",
+    "nonce": "a1b2c3d4e5f607080910a1b2",
+    "expected": "42454201000152e3b41f1e01c7ed4eb3464cb36bd401538002b20402876e3e7e5be720ae189001a1b2c3d4e5f607080910a1b213a208315d1be8d22c436e1d994d13a568cca38e"
+  },
+  {
+    "description": "Two keys, 1 derivation paths, BIP380 content",
+    "version": 1,
+    "encryption": 1,
+    "content": "02017c",
+    "keys": [
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443",
+      "0384526253c27c7aef56c7b71a5cd25bebb66dddda437826defc5b2568bde81f07"
+    ],
+    "derivation_paths": ["m/48'/1'/0'/2'"],
+    "plaintext": "wsh(or_d(pk([9d69155f/48'/1'/0'/2']tpubDDxT9mkZzWwkKwpGT5fY6iiM9muYTPkTx6Eig8dpHR7TChuGGCWYAHVmpW1ciido5RiFWwjzYsF1GZHkEHg2nrYp3zNtx3QQRkznyLhQ77x/<0;1>/*),and_v(v:pkh([9d69155f/48'/1'/0'/2']tpubDDxT9mkZzWwkKwpGT5fY6iiM9muYTPkTx6Eig8dpHR7TChuGGCWYAHVmpW1ciido5RiFWwjzYsF1GZHkEHg2nrYp3zNtx3QQRkznyLhQ77x/<2;3>/*),older(52596))))#gx5f42wh",
+    "nonce": "0102030405060708090a0b0c",
+    "expected": "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"
+  },
+  {
+    "description": "Three keys, multiple derivation paths, BIP329 content",
+    "version": 1,
+    "encryption": 1,
+    "content": "020149",
+    "keys": [
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443",
+      "0384526253c27c7aef56c7b71a5cd25bebb66dddda437826defc5b2568bde81f07",
+      "03c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee5"
+    ],
+    "derivation_paths": ["m/84'/0'/0'", "m/0/1'/2/3'"],
+    "plaintext": "{\"type\":\"tx\",\"ref\":\"f91d0a8a78462bc59398f2c5d7a84fcff491c26ba54c4833478b202796c8aafd\",\"label\":\"Transaction\",\"origin\":\"wpkh([d34db33f/84'/0'/0'])\"}\n{\"type\":\"addr\",\"ref\":\"bc1q34aq5drpuwy3wgl9lhup9892qp6svr8ldzyy7c\",\"label\":\"Address\"}\n{\"type\":\"pubkey\",\"ref\":\"0283409659355b6d1cc3c32decd5d561abaac86c37a353b52895a5e6c196d6f448\",\"label\":\"Public Key\"}\n{\"type\":\"input\",\"ref\":\"f91d0a8a78462bc59398f2c5d7a84fcff491c26ba54c4833478b202796c8aafd:0\",\"label\":\"Input\"}\n{\"type\":\"output\",\"ref\":\"f91d0a8a78462bc59398f2c5d7a84fcff491c26ba54c4833478b202796c8aafd:1\",\"label\":\"Output\",\"spendable\":false}\n{\"type\":\"xpub\",\"ref\":\"xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8\",\"label\":\"Extended Public Key\"}\n{\"type\":\"tx\",\"ref\":\"f546156d9044844e02b181026a1a407abfca62e7ea1159f87bbeaa77b4286c74\",\"label\":\"Account #1 Transaction\",\"origin\":\"wpkh([d34db33f/84'/0'/1'])\"}",
+    "nonce": "deadbeefcafebabe12345678",
+    "expected": "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"
+  },
+  {
+    "description": "Single key, proprietary content (3 bytes)",
+    "version": 1,
+    "encryption": 1,
+    "content": "03deadbeef",
+    "keys": [
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443"
+    ],
+    "derivation_paths": [],
+    "plaintext": "706c61696e74657874",
+    "nonce": "000102030405060708090a0b",
+    "expected": "42454201000152e3b41f1e01c7ed4eb3464cb36bd401538002b20402876e3e7e5be720ae189001000102030405060708090a0b26f84c8c15f2be19f27e748d2cfee936c6826c64745411034bb9508d0abf645434e686c83ffe97"
+  }
+]
diff --git a/test_vectors/encryption_secret.json b/test_vectors/encryption_secret.json
new file mode 100644
index 0000000..9ae7930
--- /dev/null
+++ b/test_vectors/encryption_secret.json
@@ -0,0 +1,89 @@
+[
+  {
+    "description": "Single public key",
+    "keys": [
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443"
+    ],
+    "decryption_secret": "752a7552d8aea88ad52cd65ba4d2c1e250cf9f10b12899d9b6253bf391f18190",
+    "individual_secrets": [
+      "52e3b41f1e01c7ed4eb3464cb36bd401538002b20402876e3e7e5be720ae1890"
+    ]
+  },
+  {
+    "description": "Two public keys",
+    "keys": [
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443",
+      "0384526253c27c7aef56c7b71a5cd25bebb66dddda437826defc5b2568bde81f07"
+    ],
+    "decryption_secret": "e3cd0f84291d9321a65adf8bcf077664af83581389b5337e9a9494535b4e967b",
+    "individual_secrets": [
+      "c404cec9efb2fc463dc54f9cd8be6387acccc5b13c9f2dc912cff447ea110f7b",
+      "af0551aea6c8caa35cdf87909d9a01e4f0f8a68117072016f97c94088f5b70e7"
+    ]
+  },
+  {
+    "description": "Three public keys",
+    "keys": [
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443",
+      "0384526253c27c7aef56c7b71a5cd25bebb66dddda437826defc5b2568bde81f07",
+      "03c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee5"
+    ],
+    "decryption_secret": "8f25c290edae9a34adb9b7dc8802278df1b2b6bdc38d7b5573bf5738872fe264",
+    "individual_secrets": [
+      "a8ec03dd2b01f553362627cb9fbb326ef2fd2b1f76a765e2fbe4372c36707b64",
+      "c3ed9cba627bc3b6573cefc7da9f500daec9482f5d3f683d10575763533a04f8",
+      "d05e74e2e9554a3fc1fd09a2570bcb05541db7e6a65f0792ee2c7c8bf6059a4b"
+    ]
+  },
+  {
+    "description": "Three public keys bis (different sorting)",
+    "keys": [
+      "03c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee5",
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443",
+      "0384526253c27c7aef56c7b71a5cd25bebb66dddda437826defc5b2568bde81f07"
+    ],
+    "decryption_secret": "8f25c290edae9a34adb9b7dc8802278df1b2b6bdc38d7b5573bf5738872fe264",
+    "individual_secrets": [
+      "a8ec03dd2b01f553362627cb9fbb326ef2fd2b1f76a765e2fbe4372c36707b64",
+      "c3ed9cba627bc3b6573cefc7da9f500daec9482f5d3f683d10575763533a04f8",
+      "d05e74e2e9554a3fc1fd09a2570bcb05541db7e6a65f0792ee2c7c8bf6059a4b"
+    ]
+  },
+  {
+    "description": "Three public keys ter (different sorting)",
+    "keys": [
+      "0384526253c27c7aef56c7b71a5cd25bebb66dddda437826defc5b2568bde81f07",
+      "03c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee5",
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443"
+    ],
+    "decryption_secret": "8f25c290edae9a34adb9b7dc8802278df1b2b6bdc38d7b5573bf5738872fe264",
+    "individual_secrets": [
+      "a8ec03dd2b01f553362627cb9fbb326ef2fd2b1f76a765e2fbe4372c36707b64",
+      "c3ed9cba627bc3b6573cefc7da9f500daec9482f5d3f683d10575763533a04f8",
+      "d05e74e2e9554a3fc1fd09a2570bcb05541db7e6a65f0792ee2c7c8bf6059a4b"
+    ]
+  },
+  {
+    "description": "Keys processed in sorted order",
+    "keys": [
+      "0384526253c27c7aef56c7b71a5cd25bebb66dddda437826defc5b2568bde81f07",
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443"
+    ],
+    "decryption_secret": "e3cd0f84291d9321a65adf8bcf077664af83581389b5337e9a9494535b4e967b",
+    "individual_secrets": [
+      "c404cec9efb2fc463dc54f9cd8be6387acccc5b13c9f2dc912cff447ea110f7b",
+      "af0551aea6c8caa35cdf87909d9a01e4f0f8a68117072016f97c94088f5b70e7"
+    ]
+  },
+  {
+    "description": "Duplicate keys should be handled",
+    "keys": [
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443",
+      "02e6642fd69bd211f93f7f1f36ca51a26a5290eb2dd1b0d8279a87bb0d480c8443"
+    ],
+    "decryption_secret": "752a7552d8aea88ad52cd65ba4d2c1e250cf9f10b12899d9b6253bf391f18190",
+    "individual_secrets": [
+      "52e3b41f1e01c7ed4eb3464cb36bd401538002b20402876e3e7e5be720ae1890"
+    ]
+  }
+]
diff --git a/test_vectors/individual_secrets.json b/test_vectors/individual_secrets.json
new file mode 100644
index 0000000..8e4f1a4
--- /dev/null
+++ b/test_vectors/individual_secrets.json
@@ -0,0 +1,554 @@
+[
+  {
+    "description": "Single secret",
+    "secrets": [
+      "0000000000000000000000000000000000000000000000000000000000000000"
+    ],
+    "expected": "010000000000000000000000000000000000000000000000000000000000000000"
+  },
+  {
+    "description": "Two different secrets",
+    "secrets": [
+      "0000000000000000000000000000000000000000000000000000000000000000",
+      "0101010101010101010101010101010101010101010101010101010101010101"
+    ],
+    "expected": "0200000000000000000000000000000000000000000000000000000000000000000101010101010101010101010101010101010101010101010101010101010101"
+  },
+  {
+    "description": "Three secrets with different patterns",
+    "secrets": [
+      "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+      "0000000000000000000000000000000000000000000000000000000000000000",
+      "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+    ],
+    "expected": "030000000000000000000000000000000000000000000000000000000000000000aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+  },
+  {
+    "description": "Empty secrets should fail",
+    "secrets": [],
+    "expected": null
+  },
+  {
+    "description": "256 secrets should fail (exceeds u8::MAX)",
+    "secrets": [
+      "0000000000000000000000000000000000000000000000000000000000000000",
+      "0000000000000000000000000000000000000000000000000000000000000001",
+      "0000000000000000000000000000000000000000000000000000000000000002",
+      "0000000000000000000000000000000000000000000000000000000000000003",
+      "0000000000000000000000000000000000000000000000000000000000000004",
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+    ],
+    "expected": null
+  },
+  {
+    "description": "256 secrets should pass)",
+    "secrets": [
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