2,966 reputation
417
bio website
location
age
visits member for 9 months
seen 7 hours ago

11h
answered Is MAC-then-encrypt with stream ciphers secure?
Jul
20
awarded  Enlightened
Jul
20
awarded  Nice Answer
Jul
18
answered Is TripleDES 168bit vulnerable to Differential Cryptanalysis?
Jul
17
awarded  Enlightened
Jul
17
awarded  Nice Answer
Jul
16
comment Does having a known plaintext prefix weaken AES256?
You're right :)
Jul
16
answered CBC-MAC length extension attack with IV simulation
Jul
16
answered Does having a known plaintext prefix weaken AES256?
Jul
12
revised Effective security of block cipher – equal the key size, or half the key size?
added 76 characters in body
Jul
12
answered Effective security of block cipher – equal the key size, or half the key size?
Jul
11
comment What is a proof of data possession that accounts for fake mirrors?
@otus This requires sending to Bob $m$ encryptions of the same file, where $m$ is the number of mirrors.
Jul
10
answered How can a Vigenère cipher be broken if the message is short?
Jul
8
comment When only using one-way hashing, is it possible to tell the number of characters changed between the old and new password?
If such fingerprint can be obtained, a password can be found within seconds:)
Jul
8
comment How is this affine function a pair wise independent permutation?
Is the first sentence a definition? What is $I_n$?
Jul
3
answered Math to replace s-boxes - Good or bad idea?
Jul
3
comment Is a keyed PRF a MAC?
I'd note that the first statement is incorrect: a secure MAC is not necessarily a secure PRF. Consider any secure MAC and add a single zero bit in the end. The result is clearly not random, but equally secure as a MAC.
Jul
3
comment Is a keyed PRF a MAC?
I would add that we are talking about secure PRFs and secure MACs.
Jun
20
revised Using PBKDF2 twice with different argument order
added 659 characters in body
Jun
19
awarded  Custodian