MDC-2

In cryptography, MDC-2 (Modification Detection Code 2, sometimes called Meyer-Schilling) is a cryptographic hash function. MDC-2 is a hash function based on a block cipher with a proof of security in the ideal-cipher model. The length of the output hash depends on the underlying block cipher used.

For a given message ${\displaystyle M}$ to hash and a given block cipher encryption function ${\displaystyle E}$, the MDC-2 algorithm proceeds as follows. Let ${\displaystyle n}$ be the block length, ${\displaystyle A_{1},B_{1}}$ two different constants of size ${\displaystyle n}$. If ${\displaystyle M=M_{1}||..||M_{m}}$ where each ${\displaystyle M_{i}}$ has size ${\displaystyle n}$, then the hash ${\displaystyle V_{m}||W_{m}}$ of the message is given by:

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