From which/what hash function/s does SHA-0 and SHA-1...

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Question by Praveen Gauravaram
Submitted on 1/7/2004
Related FAQ: Cryptography FAQ (01/10: Overview)
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From which/what hash function/s does SHA-0 and SHA-1 derived?? I am just wondering whether are they derived from MD4 or MD5 and in what way are they related to them.

Answer by Marcos Juarez
Submitted on 6/27/2004
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They are both derived from MD4, Rivest'sprevious effort of a one-way hash before coming up with MD5. In many ways, MD5 and SHA-1 are very similar. They both took the weaknesses of MD4, and improved them significantly. However, SHA-1 also added 32 more bits to the hash, making it much less vulnerable to the famous birthday-attack. Bruce Schneier's"Applied Cryptography" has a very detailed explanation of the differences.

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