ff1

https://github.com/a-abdellatif98/ff1_gem

A Ruby implementation of the FF1 Format Preserving Encryption algorithm from NIST SP 800-38G. Features dual-mode operation: reversible encryption for active data and irreversible encryption for GDPR compliance and secure data deletion while maintaining format and relationships. Now includes full UTF-8 text encryption support for arbitrary strings while preserving FF1 security properties.