John Gietzen

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330 reputation

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bio	website	twitter.com/otac0n
	location	Seattle, WA
	age	27
visits	member for	1 year, 10 months
	seen	Dec 21 '12 at 18:43
stats	profile views	30

I'm a father, a lover, a programmer and a guitarist.
Twitter: http://twitter.com/otac0n

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4 Questions

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17	Is there a secure cryptosystem that can be performed mentally?
12	With sufficient randomness, is XOR an acceptable mechanism for encrypting?
7	What is pre-image resistance, and how can the lack thereof be exploited?
4	Is it feasible to build a stream cipher from a cryptographic hash function?

330 Reputation

+40	Is there a secure cryptosystem that can be performed mentally?
+20	With sufficient randomness, is XOR an acceptable mechanism for encrypting?
+10	What is pre-image resistance, and how can the lack thereof be exploited?
+5	Is it feasible to build a stream cipher from a cryptographic hash function?

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1 Answer

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1	Properties of PRNG / Hashes

10 Tags

1 hash × 3	0 passwords
1 random-number-generator	0 preimage-resistance
0 encryption × 2	0 hash-collision
0 stream-cipher × 2	0 collision-resistance
0 block-cipher	0 xor

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