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Nov
23
answered Block Cipher vs Stream Cipher in Web Application
Nov
22
comment How to break AES/CBC/PKCS5 when key and IV are reused?
It's not a password database, is it? Adobe did that, and look where it got them.
Nov
22
comment How to break AES/CBC/PKCS5 when key and IV are reused?
+1 for noting the equivalence to ECB. Basically, the ways to attack this scheme are the same as you'd use to attack ECB (i.e. rely on the determinism to leak information if plaintext blocks are repeated).
Nov
22
reviewed Approve pir tag wiki
Nov
22
reviewed Approve pir tag wiki excerpt
Nov
21
revised Prime number theorem - RSA
mathjax formatting, spelling
Nov
20
comment Is the following symmetric design secure?
I know what both parts mean, but it's not obvious to me how you want to combine them. (For instance, in order to be reversible, the output obviously can't be entirely random.)
Nov
20
comment Is the following symmetric design secure?
Do you have a precise definition for your "reversible random oracle"?
Nov
20
comment Is CBC mode encryption vulnerable to a reordering attack?
@Bush: The attacker won't (AFAIK) be able to construct a ciphertext that would decrypt to $m_2 \mathbin\| m_1$, if that's what you're asking. He can, however, construct one that he knows will decrypt to $(m_2 \oplus c_1 \oplus v) \mathbin\| (m_1 \oplus c_2 \oplus v)$. (And if he can modify the IV, he can replace the first half of that with anything he wants.)
Nov
20
revised Is CBC mode encryption vulnerable to a reordering attack?
add "_k"
Nov
20
revised Is CBC mode encryption vulnerable to a reordering attack?
copyedit
Nov
20
answered Is CBC mode encryption vulnerable to a reordering attack?
Nov
20
reviewed Approve hybrid PKE scheme CCA2 insecurity
Nov
19
reviewed Reject public-key tag wiki excerpt
Nov
19
reviewed Approve u-prove tag wiki
Nov
19
reviewed Approve public-key tag wiki
Nov
19
reviewed Edit Is CBC mode encryption vulnerable to a reordering attack?
Nov
19
revised Is CBC mode encryption vulnerable to a reordering attack?
add missing underscore to "m2"
Nov
19
reviewed Approve u-prove tag wiki excerpt
Nov
12
revised How does secret sharing solve the partial exposure problem?
copyedit, adjust tags