Format-Preserving-Encryption

• Format-Preserving Encryption: The FFX Mode, Rank-Encipher-Unrank, and Legacy Database Protection · 2023-02-25

  A technical deep dive into FPE: the Feistel-based FFX mode with AES, the rank-encipher-unrank construction, and practical applications in encrypting legacy databases and tokenization systems without breaking schemas.