Cryptography

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earned this badge 4 times.
Is it feasible to build a stream cipher from a cryptographic hash function?
Awarded Jan 8 '16 at 17:55
What are preimage resistance and collision resistance, and how can the lack thereof be exploited?
Awarded Oct 21 '14 at 18:48
With sufficient randomness, is XOR an acceptable mechanism for encrypting?
Awarded Aug 14 '12 at 8:11
Is there a secure cryptosystem that can be performed mentally?
Awarded Jun 21 '12 at 21:28

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