Connected: An Internet Encyclopedia
5. Differences Between MD4 and MD5
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5. Differences Between MD4 and MD5
5. Differences Between MD4 and MD5
The following are the differences between MD4 and MD5:
- A fourth round has been added.
- Each step now has a unique additive constant.
- The function g in round 2 was changed from (XY v XZ v YZ) to
(XZ v Y not(Z)) to make g less symmetric.
- Each step now adds in the result of the previous step. This
promotes a faster "avalanche effect".
- The order in which input words are accessed in rounds 2 and
3 is changed, to make these patterns less like each other.
- The shift amounts in each round have been approximately
optimized, to yield a faster "avalanche effect." The shifts in
different rounds are distinct.
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Connected: An Internet Encyclopedia
5. Differences Between MD4 and MD5