A nilsimsa code is something like a hash, but unlike hashes, a small change in the message results in a small change in the nilsimsa code. The Digest::Nilsimsa module allows you to compute nilsimsa codes from within Perl programs. Information on Nilsimsa can be found here: http://ixazon.dynip.com/~cmeclax/nilsimsa.html
WWW: http://search.cpan.org/dist/Digest-Nilsimsa/
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