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1h
answered Understanding Pseudo Random Generators
6h
answered Why haven't military-precision channel GPS receivers been hacked yet (like game consoles or Apple devices)?
1d
comment Single-purpose symmetric encryption scheme for single files
For the "file" command to work properly, you're going to want the first few bytes of the file to describe what kind of file this is -- often the the name of the program that produces the file (in UTF8 characters), followed by a version number.
1d
comment Single-purpose symmetric encryption scheme for single files
What is the advantage over " 7z a -p outfile infile.txt "? (Perhaps using 'tar', as described in the 7z man page, to store the metadata). See "7-Zip's AES encryption".
Sep
16
answered The difference between being not strongly collision resistant, and not weakly collision resistant?
Sep
12
answered Are there cryptographic hash functions with homomorphic properties?
Sep
2
revised Repeatable crypto
clarify (I hope)
Sep
2
comment Repeatable crypto
Yes, a system that lets the attacker get the encryption key -- is broken. However, there is a way to attack the deduplication, even if the attacker doesn't know the original key.
Sep
2
revised Repeatable crypto
say a few words about chosen-plaintext attack
Sep
1
answered Repeatable crypto
Aug
31
revised Repeatable crypto
add "host-proof" tag
Aug
29
comment What is the most secure hand cipher?
@AaronToponce: by "this", do you mean the cipher is impractical, or that the cipher is practically secure against this attack because this particular attack is impractical?
Aug
28
answered Security of very simple XOR with random?
Aug
26
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