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Mar
13
answered Security of integrity protection with HMAC vs AEAD
Mar
12
reviewed No Action Needed Is the 1st Encrypted Block Less Secure Than Subsequent Ones?
Mar
12
reviewed Reviewed Security of integrity protection with HMAC vs AEAD
Mar
12
reviewed Reviewed FileVault AES-XTS decryption with cipher text that's missing a part
Mar
12
comment Beginner question about secure communication with one user using DES
Is that really the exact question asked? I suppose the users could implement a Diffie-Hellman key exchange, if that's allowed, and then derive a DES (or better yet, triple-DES) key from the DH result. But without some kind of a prior shared secret (or asymmetric key pair), there's no way for the users to know they're talking with each other, and not with some middle-man.
Mar
12
comment Implementing modular reductions (n*n)
Reduce modulo $n$, subtract remainder from input, divide by $n$, reduce again? You now effectively have the last two base-$n$ digits of the input.
Mar
11
comment Repair AES-128 decrypted file
Can you tell us the exact openssl command you used? In particular, which cipher mode did you use, and did you use a salt?
Mar
11
comment Encrypt-then-MAC: Do I need to authenticate the IV?
Congrats for hitting the Hot Network Questions list, by the way. :)
Mar
11
comment Is the 1st Encrypted Block Less Secure Than Subsequent Ones?
Related: crypto.stackexchange.com/questions/5421/…
Mar
11
answered Inconsistent terminology for ciphers and algorithms
Mar
11
reviewed Close How to compute accumulated values in bilinear map accumulators
Mar
11
reviewed Reviewed What is the probability of finding 4 equal bytes?
Mar
11
answered Is creating a own protocol safe or should TLS always be used?
Mar
11
comment Composing two one-way functions such that the result is not a one-way function
Ps. If you really must have two distinct one-way functions, you could always, say, use $1^{n/2}$ instead of $0^{n/2}$ for one of them.
Mar
11
revised Composing two one-way functions such that the result is not a one-way function
copyedit
Mar
11
comment Is $f(x)\oplus x$ a one-way function?
Just FYI, I borrowed your construction for a (community wiki) answer to a related question.
Mar
11
answered Composing two one-way functions such that the result is not a one-way function
Mar
11
revised Is $f(x)\oplus x$ a one-way function?
move period inside display math, add some paragraph breaks
Mar
11
awarded  block-cipher
Mar
10
reviewed Close how to integrate 2-3 algorithms to encrypt large data fastly and securely insted using AES?