New answers tagged entropy
Remember that a hash function does not create entropy (it can make it very hard to detect a lack of entropy though). Therefore, if the input has 128-bits of entropy, the output has 128-bits of entropy as a maximum. If the output size is 256 bits, then each output bit has $0.5$ bits of entropy. Taking $1/2$ the output bits will cut the entropy in half. To ...
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