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1 vote

Use blake2 permutation as a block cipher

The BLAKE2b keyed permutation is not an ideal cipher. For $2^{64}$ "weak" keys consisting of the same word $k$ repeated $16$ times, it is elementary to distinguish it from a random ...
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2 votes

Use blake2 permutation as a block cipher

To answer question 1, we don't know whether that will be a secure construction. Just because the compression function of a hash function is secure when using it as a hash function doesn't mean it's ...
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