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Crypto.OFBMode

Similar to Crypto.CBCMode, it is a simple mode designed to prevent trivial forms of replay and swap attacks on ciphers. It is given as: C−1=Ek(C−1)Ci=Pi⊕C−1\begin{aligned} C_{-1} &= E_k(C_{-1}) \\ C_i &= P_i \oplus C_{-1} \end{aligned}

Like in the Crypto.CFBMode, the output width is the same as the width of the block cipher. This mode will also buffer the output which will allow you to encrypt or decrypt partial blocks without delay.

Types

TypeDescription
TOFBCipherModeOFB Cipher Mode
← TLRWCipherModeTOFBCipherMode →