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1d
answered Security of very simple XOR with random?
2d
awarded  Yearling
Aug
26
answered Good challenges for a crypto competition for teenagers
Aug
26
answered Good challenges for a crypto competition for teenagers
Aug
18
accepted Should we sign-then-encrypt, or encrypt-then-sign?
Aug
8
answered How feasible is word-level frequency analysis over English (or any language)?
Jul
29
comment Is there a cryptographic hash function that can be performed with pencil and paper?
@JohnDeters: I agree that colluding web site admins is unrealistic. However, I have accounts on so many different websites that it is not unreasonable to suspect that at least 2 of those sites will accidentally leak my password to an attacker.
Jul
28
revised How does a rolling code work?
yet another app note
Jul
28
answered How does a rolling code work?
Jul
5
answered Encrypting text file line by line with stable encryption
Jun
11
comment Can you help me understand what a cryptographic “salt” is?
@Mike: Who? Someone says "You should always assume the attacker knows the salt.". People at another page says "Salts are public", and later says "the salts are known, because that's the industry-standard use of the word salt." Another says "the salt are public knowledge, or at least should be treated as public knowledge.".
May
6
revised Encrypting a short phrase into two keys. both with length of 32letters
more fun with visual cryptography
May
3
answered Encrypting a short phrase into two keys. both with length of 32letters
Apr
27
revised Is there a cryptographic method to add noise to a plaintext instead of actually encrypting it?
move comment by questioner into main part of question; add tags that seem relevant
Apr
27
revised Can I construct a zero-knowledge proof that I solved a Project Euler problem?
fix broken link; divide into sections.
Apr
22
answered How to calculate Modulo using a standard calculator for a one time pad encryption
Apr
21
comment encrypt message with one digest 0-9 instead of 01-26
I've been told that historically this Gronsfeld cipher was actually used more often than the Vigenère cipher.
Apr
21
awarded  Civic Duty
Mar
22
comment Do any one-key-of-many cryptographic schemes exist?
+1. Perhaps you might also mention: This standard construction is standardized in more detail in "RFC 4880: OpenPGP Message Format".
Mar
15
comment Analogue encryption algorithms
I agree that most of these systems are mostly just obfuscation. Most people define things like the Playfair cipher as "encryption", although it is relatively easily distinguished from white noise. Even using your unnecessarily strict definition of "encryption", I suspect that it may be possible to build an analog system that would be practically indistinguishable from white noise; with a vocoder + frequency hopping using a "good" pseudo-random number generator + random chaff.