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visits member for 11 months
seen 2 days ago

Apr
16
asked Composing hashes and/or MACs
Apr
15
awarded  Critic
Apr
15
comment Positioning of keys in encrypted text
The name of that technique is "EXTREMELY BAD"
Apr
15
comment Positioning of keys in encrypted text
What? There IS NO KEY IN THE CIPHERTEXT!!! Ever!
Apr
14
accepted Is there an algorithm to check if an elliptic curve is secure?
Apr
10
asked Is there an algorithm to check if an elliptic curve is secure?
Apr
9
comment Multi cipher CTR
yes, this would be better than breaking one cipher and that resulting in breaking the whole ciphertext
Apr
8
comment Multi cipher CTR
why silly? In order to break this, one would have to break all ciphers.
Apr
8
comment Multi cipher CTR
yes, in essence that's it
Apr
8
comment Multi cipher CTR
It's never the same block, it's the next block ...
Apr
8
comment Multi cipher CTR
You misunderstood... they is only one IV, the first cipher encrypts it and xors the result to the first block of plaintext, the second cipher encrypts iv+1 and xors that in the next block of plaintext
Apr
8
comment Multi cipher CTR
cipher 1 is used with key one to encrypt the IV, this is xored with the first block of plaintext, then cipher 2 is used with key 2 and IV+1, then cipher 3 then back to cipher 1... do you understand this ?
Apr
8
comment Multi cipher CTR
If this is a secure mode of operation? Using 3 cipher like this
Apr
8
revised Multi cipher CTR
readability improved
Apr
8
asked Multi cipher CTR
Apr
7
awarded  Nice Question
Apr
1
comment Encrypting the same message using different schemes
if E1 and E2 are both IND-CPA then that combination should also be IND-CPA
Mar
28
asked Does repeated hashing create a PRF?
Feb
5
comment Key change and key derivation
That would be bad ... as it might open the encryption to a related key attack...
Feb
5
comment Key change and key derivation
Both, as I recall they mean the same thing...