On 3/21/10 5:59 PM, Paul Richard Ramer wrote: > I believe that you meant SHA-1 and not SHA-128, because there isn't a > hash called SHA-128.
There is, although the name is unofficial and not widely used. When people migrated from MD5 to SHA-1, there were a lot of protocols that only had 128 bits reserved for the hash. A common hack was to use SHA-1 and drop 32 bits. RIPEMD-128 is RIPEMD-160 with 32 bits dropped, and RIPEMD-128 is an officially recognized name. A fair number of people applied the same reasoning to SHA-1, and thus SHA-128 was born. Unlike RIPEMD-128, SHA-128 was never official. The name never took off, although the hack was pretty commonly used.
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