IMPORTANT: Do NOT create public GitHub issues for security vulnerabilities.

If you discover a security vulnerability, please follow these steps:

1. Email the maintainer privately with:

   • Description of the vulnerability
   • Steps to reproduce
   • Potential impact
   • Suggested fix (if any)

2. Allow time for response

   • We aim to respond within 48 hours
   • We'll work with you to understand the issue
   • We'll develop and test a fix

3. Coordinated disclosure

   • We'll credit you (if desired)
   • We'll publish security advisory
   • We'll release patched version

• Type of vulnerability (e.g., injection, XSS, authentication bypass)
• Full paths of affected source files
• Location of affected code (tag/branch/commit or direct URL)
• Step-by-step instructions to reproduce
• Proof-of-concept or exploit code (if possible)
• Impact of the vulnerability
• How you discovered it

• Acknowledgment within 48 hours
• Progress updates every 5-7 days
• Timeline for fix based on severity
• Credit in security advisory (if desired)

This is a proof-of-concept system. For production use:

1. Storage

   • Uses JSON file (not encrypted)
   • No access controls
   • Single point of failure

2. Transport

   • HTTP only (development)
   • No TLS/HTTPS
   • Vulnerable to MITM

3. Authentication

   • No user authentication
   • No authorization
   • No session management

4. Input Validation

   • Basic validation only
   • Potential for abuse
   • Size limits not enforced

5. Steganography

   • LSB only (basic method)
   • Vulnerable to compression
   • No error correction

Before deploying to production:

• HTTPS/TLS 1.3 - Encrypt all traffic
• Authentication - User login required
• Authorization - Role-based access control
• Database encryption - Encrypt at rest
• Input validation - Comprehensive checks
• Rate limiting - Prevent abuse
• Logging - Security event logging
• Monitoring - Intrusion detection
• Backup - Encrypted backups
• Security audit - Professional review

• WAF - Web application firewall
• 2FA - Two-factor authentication
• CSP - Content Security Policy
• HSTS - HTTP Strict Transport Security
• Secrets management - Vault/KMS
• Penetration testing - Regular tests
• Compliance - GDPR/SOC2/etc.
• Incident response - Have a plan

Signature screenshot/copy attacks
Document tampering after signing
Signature reuse on different documents
Unauthorized signature creation

Network interception (needs HTTPS)
Server compromise (needs hardening)
Social engineering
Malicious insiders
Advanced steganography attacks
Quantum computing threats

1. Never commit secrets

   • No API keys, passwords, tokens
   • Use environment variables
   • Use secrets management

2. Validate all input

   • Check file types
   • Limit file sizes
   • Sanitize user data

3. Use parameterized queries

   • Prevent SQL injection
   • Use ORM when possible

4. Keep dependencies updated

   • Regular updates
   • Security patches
   • Vulnerability scanning

5. Follow principle of least privilege

   • Minimal permissions
   • Separate accounts
   • Regular audits

1. Use strong authentication

   • Strong passwords
   • Enable 2FA
   • Regular password changes

2. Verify signatures

   • Always verify important documents
   • Check verification messages
   • Don't trust without verification

3. Protect private keys

   • Store securely
   • Never share
   • Use hardware tokens

4. Regular audits

   • Review signed documents
   • Check for suspicious activity
   • Report anomalies

5. Keep software updated

   • Update regularly
   • Apply security patches
   • Monitor security advisories

1. Day 0: Vulnerability reported
2. Day 2: Acknowledgment sent
3. Day 7: Initial assessment complete
4. Day 30: Fix developed and tested
5. Day 45: Patch released
6. Day 90: Public disclosure (if not critical)

Critical vulnerabilities may have accelerated timeline.

Before deploying to production:

Infrastructure

• HTTPS enabled with valid certificate
• Firewall configured
• Intrusion detection active
• DDoS protection enabled
• Regular backups configured

Application

• All dependencies updated
• Security headers configured
• Input validation comprehensive
• Output encoding implemented
• Error handling doesn't leak info

Authentication

• Strong password policy
• Account lockout enabled
• Session management secure
• 2FA available
• Password reset secure

Data Protection

• Encryption at rest
• Encryption in transit
• Secure key management
• Data retention policy
• GDPR compliance

Monitoring

• Security logging enabled
• Log aggregation configured
• Alerting set up
• Regular log reviews
• Incident response plan

Subject: SQL Injection in signature verification

Description: The signature_id parameter in the verify
endpoint is vulnerable to SQL injection.

Steps to Reproduce:
1. Navigate to /verify
2. Submit: signature_id=' OR '1'='1
3. Observe: All signatures returned

Impact: Attacker can access all signatures in database

Suggested Fix: Use parameterized queries or ORM

Subject: Your site is hackable

Description: I can hack your database

Steps: Try harder lol

Impact: Everything

Subscribe to security updates:

• Watch GitHub repository
• Enable security advisories
• Follow release notes
• Join mailing list (if available)

Security researchers who responsibly disclose vulnerabilities will be acknowledged here.

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For security concerns, please email: [Your contact email]

Response Time: 48 hours
Available: 24/7 for critical issues

Thank you for helping keep this project secure!