diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5654ca8e..ce700078 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- IPC writes of X.509 identities decode their declared text encoding before
+  storage, so protected and unprotected archives round-trip without corruption.
+
 - Imported X.509 identities accept self-issued certificates signed by a distinct
   issuer with the same name and preserve supplementary Unicode in certificate
   subjects for both leaf and issuer certificates when exporting PKCS#12,
diff --git a/secretspec/src/secrets.rs b/secretspec/src/secrets.rs
index 05aeafa6..f9fce3d0 100644
--- a/secretspec/src/secrets.rs
+++ b/secretspec/src/secrets.rs
@@ -7201,7 +7201,9 @@ impl Secrets {
     ) -> Result<StoredSecret> {
         with_ipc_audit_purpose(purpose, || {
             self.require_ipc_surface(AuditAction::Set, name)?;
-            self.store_secret_with_input(name, |_| Ok(SecretBytes::from_utf8(value)), false)
+            // IPC carries text, so typed binary values use their declared
+            // encoding just as they do in `set_text` and inline reads.
+            self.store_secret_with_input(name, |_| Ok(SecretBytes::from_utf8(value)), true)
         })
     }
 
diff --git a/secretspec/src/typed_tests.rs b/secretspec/src/typed_tests.rs
index d1a0f3b7..60577334 100644
--- a/secretspec/src/typed_tests.rs
+++ b/secretspec/src/typed_tests.rs
@@ -1491,6 +1491,67 @@ TEXT = { description = "encoded input", type = "x509_identity", as_path = true }
     }
 }
 
+#[cfg(feature = "cli")]
+fn assert_ipc_identity_text_write_round_trip(body: &str, bytes: &[u8]) {
+    use crate::secrets::IpcAuditPurpose;
+
+    let encoded = BASE64.encode(bytes);
+    let (dir, spec) = dotenv_spec(body, &format!("ID={encoded}\n"));
+    let purpose = || IpcAuditPurpose {
+        consumer: "typed-test".into(),
+        operation: "set".into(),
+        host: None,
+        path: None,
+    };
+
+    // Text input may carry a trailing newline, but the stored representation
+    // must remain canonical and must never gain a second layer of encoding.
+    spec.store_named_for_ipc("ID", format!("{encoded}\r\n"), purpose())
+        .unwrap();
+    let response = spec.resolve().unwrap();
+    assert!(response.is_ok());
+    let value = response.secrets["ID"].value.as_deref().unwrap();
+    assert_eq!(value, encoded);
+    assert_eq!(BASE64.decode(value.as_bytes()).unwrap(), bytes);
+
+    // Invalid encoded text must fail before overwriting the valid archive,
+    // including when a password binding defers archive validation to reads.
+    let stored = fs::read(dir.path().join(".env")).unwrap();
+    let error = spec
+        .store_named_for_ipc("ID", "invalid%".to_string(), purpose())
+        .err()
+        .unwrap();
+    assert!(matches!(error, SecretSpecError::DecodeFailed { .. }));
+    assert_eq!(fs::read(dir.path().join(".env")).unwrap(), stored);
+}
+
+#[cfg(feature = "cli")]
+#[test]
+fn ipc_identity_text_writes_round_trip_unprotected_archives() {
+    let _env = scrub_resolution_env();
+    assert_ipc_identity_text_write_round_trip(
+        r#"
+[profiles.default]
+ID = { description = "identity", type = "x509_identity" }
+"#,
+        &generated_identity(),
+    );
+}
+
+#[cfg(feature = "cli")]
+#[test]
+fn ipc_identity_text_writes_round_trip_protected_archives() {
+    let _env = scrub_resolution_env();
+    assert_ipc_identity_text_write_round_trip(
+        r#"
+[profiles.default]
+ID = { description = "identity", type = "x509_identity", credentials = { password = "PW" } }
+PW = { description = "password", default = "fixture-password" }
+"#,
+        include_bytes!("../tests/fixtures/x509/p256.pfx"),
+    );
+}
+
 #[cfg(feature = "cli")]
 #[test]
 fn ipc_derived_identity_files_are_leased_and_persistent_generation_is_read_only() {