Update SECURITY.md documentation

- Remove reference to non-existent migration script
- Fix contradictory "No Database Encryption" limitation (encryption is available)
- Update version history to v2.3
- Update last modified date

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Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: JavaDogWebDesign

SECURITY.md

@@ -136,12 +136,7 @@ DB_ENCRYPTION_KEY=<your-db-key>
 FILE_ENCRYPTION_KEY=<your-file-key>
 ```
 
-3. For new installations, encryption is automatic once keys are set
-
-4. For existing installations, run migration:
-```bash
-python migrate_to_encryption.py
-```
+3. Restart the application - encryption is automatic once keys are set
 
 **CRITICAL SECURITY NOTES:**
 - ⚠️ **Backup encryption keys separately from data!**
@@ -349,18 +344,14 @@ WantedBy=multi-user.target
 1. **No Two-Factor Authentication (2FA)**
    - Planned: TOTP-based 2FA
 
-2. **No Database Encryption**
-   - Current: SQLite without encryption
-   - Planned: SQLCipher integration
-
-3. **No Audit Logging**
+2. **No Audit Logging**
    - Planned: Comprehensive audit trail
 
-4. **Basic Password Policy**
+3. **Basic Password Policy**
    - Current: 6 character minimum
    - Planned: Complexity requirements, strength meter
 
-5. **No Email Verification**
+4. **No Email Verification**
    - Planned: Email verification on registration
 
 ## Reporting Security Issues
@@ -379,7 +370,12 @@ We will respond within 48 hours and work with you to address the issue.
 
 ## Version History
 
-### v2.2 (Current)
+### v2.3 (Current)
+- Added optional database encryption (SQLCipher)
+- Added optional file encryption (Fernet)
+- OIDC/SSO authentication support
+
+### v2.2
 - Added CSRF protection (Flask-WTF)
 - Implemented rate limiting (Flask-Limiter)
 - Enforced SECRET_KEY requirement
@@ -400,5 +396,5 @@ We will respond within 48 hours and work with you to address the issue.
 
 ---
 
-**Last Updated:** 2025-11-20
+**Last Updated:** 2025-12-10
 **Maintained By:** HSA Tracker Development Team