crypto_cfbmode.md 752 B
id: crypto.cfbmode title: Crypto.CFBMode
sidebar_label: Introduction
Ciphertext Feedback Mode is a mode designed to prevent trivial forms of replay and swap attacks on ciphers. It is given as: $$$ \begin{aligned} C_i &= Pi \oplus C{-1} \ C_{-1} &= E_k(C_i) \end{aligned} $$$
The output feedback width is equal to the size of the block cipher. That is this mode is used to encrypt whole blocks at a time. However, the library will buffer data allowing the user to encrypt or decrypt partial blocks without a delay. When this mode is first setup it will initially encrypt the initialization vector as required.
Types
| Type | Description |
|---|---|
| TCFBCipherMode | CFB Cipher Mode |