This document provides information about the security features implemented in the Election System and offers guidance on maintaining and enhancing security.

The system uses blockchain technology to ensure vote integrity:

• Each vote is stored in a blockchain with cryptographic hashing
• Votes can be verified for authenticity at any time
• Any tampering with vote data is immediately detectable
• Proof-of-work algorithm adds security against fraudulent blocks

Cross-Site Request Forgery protection has been implemented:

• All forms and actions are protected with CSRF tokens
• Tokens are validated before processing sensitive actions
• Tokens expire after 2 hours for additional security

• All user inputs are validated and sanitized before processing
• SQL injection protection through prepared statements
• XSS protection with output encoding (htmlspecialchars)
• Additional input filtering for specific data types

The application implements security headers to protect against common web vulnerabilities:

• X-XSS-Protection: Prevents cross-site scripting attacks
• X-Content-Type-Options: Prevents MIME type sniffing
• X-Frame-Options: Prevents clickjacking attacks
• Content-Security-Policy: Restricts resource loading to trusted sources
• Referrer-Policy: Controls how much referrer information is sent

• Student IDs are never stored directly in the blockchain
• One-way hashing with salt ensures voter anonymity
• Additional metadata is stored securely for verification purposes

For enhanced security, the database credentials should be stored in environment variables:

1. Run the script scripts/setup_env_variables.php to create an .env file
2. Install PHP dotenv: composer require vlucas/phpdotenv
3. Move the generated configuration file into place

Make sure your .env file is not accessible from the web by adding the following to your .htaccess file:

<Files .env>
    Order allow,deny
    Deny from all
</Files>

Regularly validate the blockchain to ensure integrity:

1. Log in as an administrator
2. Go to Blockchain Verification
3. Select an election
4. Click "Validate Blockchain"

Ensure your web server is properly configured:

• Keep PHP and all libraries up to date
• Enable HTTPS using a valid SSL certificate
• Configure proper file permissions
• Set up a firewall and restrict access to sensitive directories

• Review security logs regularly at logs/security.log
• Investigate any suspicious activities
• Monitor failed login attempts
• Implement an intrusion detection system if possible

If you encounter security-related issues:

1. Check the security logs for suspicious activity
2. Validate the blockchain integrity
3. Verify that all input validation is working correctly
4. Ensure all security headers are properly set

Consider implementing these additional security features:

1. Two-factor authentication for administrators
2. Automated security scanning
3. Rate limiting for API and form submissions
4. Enhanced logging and monitoring
5. Regular security audits
6. Database encryption for sensitive data

For security concerns or to report vulnerabilities, please contact the system administrator.