Cryptography Asked by doctopus on February 9, 2021
Let’s say I have a collision resistant hash function $H: {0,1}^* rightarrow {0,1}^n$ and I want to create another collision resistant hash function $H’: {0,1}^* rightarrow {0,1}^n$ using $H$ that leaks a bit of input. Would this still constitute a collision resistant hash function?
$$H'(xmathbinVert b) = H(x)_{[1ldots n-1]} mathbin| b$$
(Here, $b$ is a single bit)
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