Ciphertext Feedback

Definitions

1. A block-cipher mode that turns a block cipher into a self-synchronizing stream-like cipher by feeding prior ciphertext into subsequent encryption steps, commonly abbreviated CFB. It is one of several historical modes still encountered in legacy systems.

   In plain English: A cipher mode that uses previous ciphertext to influence later encryption like a stream.

   Example: "The device firmware relied on ciphertext feedback mode for compatibility with an older protocol stack."

Related Terms

• Steganography
• PKI
• Homomorphic Encryption
• AES-GCM
• Cache Timing Attack
• Cipher Block Chaining
• Collision Resistance
• Cryptographic Protocol
• Lightweight Cryptography