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Hash-based commitment schemes without a computer

(7th May 2016)

An in­ter­est­ing ques­tion was posted to crypto.stack­ex­ "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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Tags: Encryption Stack Overflow