MDC-2
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In cryptography, MDC-2 (Modification Detection Code 2, sometimes called Meyer-Schilling) is a cryptographic hash function with a 128-bit hash value. MDC-2 is a hash function based on a block cipher.
[edit] MDC-2 hashes
The 128-bit (16-byte) MDC-2 hashes are typically represented as 32-digit hexadecimal numbers. The following demonstrates a 43-byte ASCII input and the corresponding MDC-2 hash:
MDC2("The quick brown fox jumps over the lazy dog")
= 000ed54e093d61679aefbeae05bfe33a
Even a small change in the message will (with probability) result in a completely different hash, e.g. changing d to c:
MDC2("The quick brown fox jumps over the lazy cog")
= 775f59f8e51aec29c57ac6ab850d58e8
The hash of the zero-length string is:
MDC2("") = 52525252525252522525252525252525
The U.S. Patent 4,908,861, submitted by IBM, expires on August 28, 2007[citation needed]. For patent reasons, support for MDC-2 has been disabled in OpenSSL on most Linux distributions.
The U.S. Patent 4,908,861 has expired in 2002[citation needed], because IBM has not paid the renewal fee. The same goes for the canadian patent. There is no patent for Europe. This means that MDC2 can be freely used.
[edit] See also
- Hash functions based on block ciphers
- The Collision Intractability of MDC-2 in the Ideal Cipher Model, John Steinberger, Eurocrypt 2007 [1]
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