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Mar
9
revised Using One Time Pad with a block cypher
added 114 characters in body
Mar
9
comment Using One Time Pad with a block cypher
As long as there are no collisions in the block cipher (there is no plain/cipher block pair that have multiple possible keys) and per-block key size is equal or larger than block size then perfect secrecy is preserved assuming no key reuse.
Mar
9
awarded  Student
Mar
9
comment Using One Time Pad with a block cypher
@fkraiem Ah I see where people got mistaken; I meant using a key as large as the plain text (like happens with one time pad)
Mar
9
revised Using One Time Pad with a block cypher
added 307 characters in body
Mar
9
comment Using One Time Pad with a block cypher
@fkraiem they are hardly one time pads though at best those are a stream cipher, All those do is add a bit of entropy to avoid repeats.
Mar
9
asked Using One Time Pad with a block cypher
Feb
13
answered Would adding daily changing nulls in front of their messages have made the Engima harder to crack?
Jun
22
awarded  Caucus
May
4
revised How to verify a shared secret using only AES?
added 36 characters in body
May
4
awarded  Citizen Patrol
Aug
20
comment A patched SHA1 attempt for password verification
"the digest value is used at some stages in a few algorithms", but why? if you need a 32 char psuedo random per user then create a unique ID per user, that way you will be safe from users changing their password screwing with those algorithms
Apr
7
comment RSA: Letting $p$ and $q$ have different bit-size
making sure the second most significant bit is different between $q$ and $p$ is enough to ensure they are not too close
Mar
26
awarded  Yearling
Mar
24
revised Why is it said that if we know few bits of pseudo random sequence we can predict the whole of it?
added 157 characters in body
Mar
6
revised why inverse in diffie-hellman protocol will not give same value?
fixed mathjax a bit
Mar
6
suggested approved edit on why inverse in diffie-hellman protocol will not give same value?
Mar
4
revised Why does CTR mode XOR the plaintext into the output of the block cipher rather than XORing the plaintext into the input of the block cipher?
fixed up mathjax formatting
Mar
4
suggested approved edit on Why does CTR mode XOR the plaintext into the output of the block cipher rather than XORing the plaintext into the input of the block cipher?
Feb
4
comment DES-encrypted cipher
and you can't make use of the knowledge that every other byte is 0?