Generating a new key
Robert J. Hansen
rjh at sixdemonbag.org
Mon Mar 22 00:06:13 CET 2010
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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