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Title:
Uniform Compression Functions Can Fail to Preserve “Full” Entropy
Authors: Daniel R. L. Brown
Abstract:To have “full” entropy has been defined in a draft NIST standard to be to have min-entropy very close, proportionally, to the min-entropy of a uniform distribution. A function is uniform if all its preimages have the same size. This report proves that the output of any uniform compression function can fail to have full entropy, even when the input has full entropy.
ePrint: https://eprint.iacr.org/2012/665
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