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Feb
20
answered Public key crypto without modular arithmetic?
Feb
18
comment Is it ok to store the plaintext hash of encrypted data
What is it used for? What are your security requirements, i.e. why are you using encryption in the first place? Are you planning on storing the digest and the cipher text in the same location or in different locations?
Feb
17
comment To understand Feistel permutations in md5
It is the four-word state vector.
Feb
17
comment How to encode a message to MD5?
It might be noted that the Bit String to Octet String conversion in MD5 uses Big Endian bit order, despite the Octet String to Word conversion within MD5 uses a Little Endian byte order. The RFC is a cautionary example of an under-specified algorithm specification.
Feb
12
revised What is base of $\log$ in Subexponential Algo for DLP?
added 2 characters in body
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
deleted 6 characters in body
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?