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Hash-based commitment schemes without a computer(7th May 2016) |
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An interesting question was posted to crypto.stackexchange.com: "Is there a simple hash function that one can compute without a computer?" Here are three proposed algorithms based on Zobrist hashing, RC4 and A5/1. These should be reasonably secure even against attacks with a calculator, except the one based on Zobrist hashing (but I don't know how to prove or dis-prove this claim). These constructs are especially well suited for commitment schemes.
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