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 encryption
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~498k people reached

Mar
2
answered How to publish a cipher (concept)?
Mar
2
comment How to publish a cipher (concept)?
Did your advisor provide any more specific reasons (besides "the review of a cipher [being] an ongoing and protracted process") why they consider your idea unsuitable for a bachelor's thesis?
Feb
29
answered Entropy calculation
Feb
29
reviewed Edit How to decode a (Vigenère?) substitution cipher?
Feb
29
revised How to decode a (Vigenère?) substitution cipher?
restore ciphertext: it does contribute useful context, especially given that the OP's guess about the type of cipher is wrong; misc. copyedits
Feb
29
comment How to decode a (Vigenère?) substitution cipher?
Alas, it turns out that your (and the OP's) initial assumption is wrong: the given message is not encrypted with a Vigenère cipher. That said, if it was, this would be a very good way to start solving it, and you have my upvote for that.
Feb
29
answered How to decode a (Vigenère?) substitution cipher?
Feb
29
comment How to decode a (Vigenère?) substitution cipher?
@Biv: I suspect that, without the specific ciphertext, this would likely be a duplicate. (Alas, I'm in a slight hurry, and don't have time to look for dupes just now.) That said, merely shifting the emphasis of the questions from "decode this for me" to "teach me how to solve ciphers like this one" should be enough to make it on topic.
Feb
20
answered Is $f(f(x))$ a one way function?
Feb
20
awarded  Enlightened
Feb
20
awarded  Nice Answer
Feb
20
comment Is $f(f(x))$ a one way function?
Does the answer to this question clarify things for you?
Feb
11
comment AES128 Decryption in Objective-C just slightly off
@Journeyman: In CBC mode, the IV is simply XORed with the first block of plaintext before encryption / after decryption. (This is also why it's so important for security that the IV be random and unpredictable in CBC encryption.) So if you know the plaintext you should be getting, you can just XOR that with the plaintext you are getting, and then XOR that with the IV you're using to obtain the correct IV.
Feb
9
comment Steganographic embedding of an RSA-encrypted message into an image
This question has nothing to do with RSA specifically. Your real problem seems to be that you haven't understood how LSB steganography works.
Feb
7
awarded  Notable Question
Feb
7
answered Is there a null HMAC?
Feb
7
comment Common Modulus Attack not reproducible
Um, no you can't. By definition, if $\gcd(m,n) = k$, then any multiple of $m$ modulo $n$ is also a multiple of $k$. The closest you can get is finding a pseudoinverse $m^*$ such that $m \times m^* = k \pmod n$ (and you can do that with the same extended Euclidean algorithm used to find normal modular inverses).
Feb
5
revised How to generate a random number so server cannot cheat?
added 329 characters in body; added 102 characters in body; added 5 characters in body
Feb
5
answered How to generate a random number so server cannot cheat?
Feb
4
revised Find the minimum Adversary's Advantage
typo