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Aug
21
answered Combine two sha512 hashes to a single hash
Aug
20
revised Combining several symmetric ciphers using XOR
associativity alone is not enough.
Aug
20
comment Combining several symmetric ciphers using XOR
You might want to mention that for this to be secure, both ciphers must be sufficiently non-similar so they don't cancel each other out, or have independent keys, preferably both.
Aug
20
comment Combining several symmetric ciphers using XOR
Please don't use the word "one-time pad" for a stream cipher. This is not the same.
Aug
15
answered Mathematically / statistically “safe” way to differentiate between crypto and random blob?
Jul
12
awarded  Yearling
Jul
12
comment How is an epsilon of 1/1000 non-negligible?
Could you elaborate on this? As it is, it doesn't answer the question at all.
Jul
1
awarded  Deputy
Jun
29
awarded  Constituent
Jun
27
awarded  Nice Question
Jun
17
awarded  Caucus
Jun
13
comment Encryption of exe file
Encryption works on anything, not just "text".
Jun
6
revised SHA-256 hash of null input?
make clear what is wanted
Jun
6
comment Are there security issues with adding plaintext length to TLS packets?
Note that your changed protocol will not be compatible to TLS anymore.
Jun
6
comment Share two secrets between two parties
Welcome to Cryptography Stack Exchange. We actually prefer answers which contain the information itself, not just referring to information elsewhere. Could you add a summary of the information to the answer? Otherwise we will convert your answer to a comment.
May
29
revised Is it practical to use a stream cipher in a block cipher mode?
added 4 characters in body
May
29
revised Is it practical to use a stream cipher in a block cipher mode?
make clear which answer is meant to be wrong (it was the accepted answer when this was written).
May
28
revised Is it practical to use a stream cipher in a block cipher mode?
add disclaimer to the top
May
28
comment Is it practical to use a stream cipher in a block cipher mode?
Actually, my answer didn't say "you can't convert a stream cipher into a block cipher", but "the way of converting which was proposed in the question doesn't work". I'll try to edit it.
May
28
revised Is it practical to use a stream cipher in a block cipher mode?
formatting