31,167 reputation
12464
bio website
location
age
visits member for 3 years, 2 months
seen 1 hour ago

27m
awarded  Nice Answer
1h
comment RSA signature scheme
Is the above supposed to be a signature scheme? If so, how would someone verify it? What would need to be in the public key? Hint: $n$ and $e$ are not sufficient.
1h
revised RSA signature scheme
added 6 characters in body
2h
comment Direct sum of Binary numbers In Mixcolumns
So, what is $02 \cdot 10000100$? By the above logic, it is $00001000 \oplus 00011011 = 00010011$ (where we xor in 00011011 because the msbit of 10000100 is a 1), and so it is exactly the answer you're looking for
12h
answered Direct sum of Binary numbers In Mixcolumns
12h
revised Direct sum of Binary numbers In Mixcolumns
edited tags
1d
reviewed Approve suggested edit on The Boneh-DeMillo-Lipton fault attack (RSA CRT)
1d
reviewed Approve suggested edit on Can you make a hash out of a stream cipher?
1d
comment A simple attack on DESX in time $2^{120}$
possible duplicate of DES-X , computation load and storage
1d
comment rsa public and private keys
Actually, we know algorithms that will generate provable primes of the same size, and with about the same efficiency (e.g. Shawe-Taylor)
1d
reviewed Leave Closed Cryptographic Dilemma
1d
reviewed Reviewed Why is the IV passed in the clear when it can be easily encrypted?
1d
comment Why is the IV passed in the clear when it can be easily encrypted?
This really isn't why we believe it's safe to send the IV in the clear. It's not because the key protects us, but instead that a) the security proof of CBC mode shows us that knowledge of the the IV does not aid the attacker, assuming that the attacker can't choose the message after knowing about the IV, and b) the observation that each ciphertext block in the message effectively acts like the IV for the rest of the message, hence sending the IV in the clear is no riskier than sending the ciphertext itself.
1d
reviewed No Action Needed rsa public and private keys
2d
comment Why cbc-mac is a secure mac with psudo-random but not random IV?
"not secure with a random IV"; is that an IV that the generator of the MAC selects, and is hence translated with the MAC? If so, wouldn't the forger (the guy without the key) also be able to select his own IVs? So, how can a forger use that to come up with a valid (Message, IV, MAC) triplet?
2d
reviewed Leave Closed General strategy for proving security of a scheme
2d
answered RSA prove $a^{\varphi(n)/g} \equiv 1 \pmod{n}$
Oct
27
reviewed No Action Needed Are there any many to one encryption frameworks available?
Oct
27
reviewed Reject suggested edit on encryption tag wiki
Oct
27
reviewed Close How to find secret key and public key for ECC cryptosystem?