Cryptography
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John Gietzen

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44 Is there a secure cryptosystem that can be performed mentally? Sep 28 '11
36 What are preimage resistance and collision resistance, and how can the lack thereof be exploited? Nov 12 '11
23 With sufficient randomness, is XOR an acceptable mechanism for encrypting? Jul 12 '11
22 Is it feasible to build a stream cipher from a cryptographic hash function? Jul 12 '11
2 Properties of PRNG / Hashes? Aug 2 '11

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