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revised What is base of $log$ in Subexponential Algo for DLP?
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Feb
10
answered How Diffie-Hellman authentication works?
Feb
9
revised Is reusing keys for CBC and CBC-MAC secure when using encrypt-then-MAC?
edited body
Feb
9
comment Is reusing keys for CBC and CBC-MAC secure when using encrypt-then-MAC?
CCM mode (counter mode with CBC MAC) uses the same keys for CTR mode encryption and for the CBC MAC.
Feb
9
answered Is reusing keys for CBC and CBC-MAC secure when using encrypt-then-MAC?
Feb
9
awarded  Nice Answer
Feb
8
awarded  Yearling
Feb
7
reviewed Approve How to find roots of equation $f(x)=0 \pmod p $, where $p$ is prime number?
Feb
7
reviewed Edit Is there a null HMAC?
Feb
7
revised Is there a null HMAC?
answered last part of the question
Feb
7
answered Is there a null HMAC?
Feb
3
accepted Single Party Encryption, Multi Party Decryption
Feb
3
revised Determining Involutary Keys in Substitution Ciphers
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Feb
3
comment Determining Involutary Keys in Substitution Ciphers
The symmetric group $S_n$ is defined as the set of all permutations over the elements of $\mathbb{Z}_n$ with composition of permutations being the group operation. If and only if an element in such a group is of order 2, then it meets the condition in your question, yes.
Feb
2
answered Determining Involutary Keys in Substitution Ciphers
Jan
30
comment Side channel security of HMAC in software
True, if the hardware leaks the number of bits affected by instructions that would otherwise be assumed to be atomic, all bets are off. This obviously begs the question exactly what might be assumed about the hardware?
Jan
30
comment Side channel security of HMAC in software
Are you aware of any kind of side channel attacks against SHA-1 or SHA-2? There are no data dependent table look-ups like in AES and the algorithms appear to have a completely input independent operation flow.
Jan
30
revised Is TLS secure against VM reset attacks?
added 483 characters in body
Jan
28
comment Can I use a one time pad key twice with random plaintext?
Let us continue this discussion in chat.
Jan
28
comment Can I use a one time pad key twice with random plaintext?
I understand your point from a purely semantic point of view, but in practice, as the example in my answer is written, there is no practical meaning to the notion of guessing the message with probability $2^{-n}$. There will still be no way to test which guess is correct, all alternatives will be equally probable, exactly because the message was random, secret and has been discarded, as stipulated.