If a hash function $H$ is collision resistant, is it true that $H(x)\neq H(x')$ for all messages $x, x'$ with $x \neq x'$?
Can we assume that a hash function with high collision resistance also means a highly uniform distribution?
In 2020, SHA-1 practically broken in chosen-prefix collision (CP-collision). Can double SHA-1 hashing prevent CP-collision?
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