How secure is a partial 64bit hash of a SHA1 160bit hash?


Sigtryggur
HOME ยป Information Security

So http://en.wikipedia.org/wiki/SHA-1 SHA-1 produces a 160-bit (20-byte) hash valueand As of 2012, the most efficient attack against SHA-1 is considered to be the one by Marc Stevens with an estimated cost of $2.77M to break a single hash value by renting CPU power from cloud serversWith a theoretical attack taking 2^60 operationsSo if a custom verification algorithm only the first 64bits of the full hash how secure is that? How many operations would it require?

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