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  • 0 posts edited
  • 5 helpful flags
  • 158 votes cast
Apr
17
comment Security of permutation cipher
Yes, I think that makes sense now. So you are saying the same as @fgrieu in this comment above? So one can't recover the entire plain text, but will be able to recover some.
Apr
16
comment Security of permutation cipher
@rath: I am not sure that I understand. So in a sense the key consists of $sigma_1, \dots , \sigma_n$. It is assumed that these permutations are constructed randomly first.
Apr
16
comment Security of permutation cipher
I don't understand that last part. How can we recover the plaintext if we know $\sigma_1$?
Apr
16
asked Security of permutation cipher
Feb
27
awarded  Benefactor
Feb
27
accepted Get permutations from password
Feb
21
comment Get permutations from password
Thank you for the answer. Would you elaborate a bit more? (I am not very familiar with cryptography.)
Feb
20
comment Get permutations from password
@RickyDemer: No (even though I would be interested in knowing how this could be done as well).
Feb
20
revised Get permutations from password
added 60 characters in body
Feb
20
asked Get permutations from password
Jan
9
awarded  Investor
Dec
22
accepted What are the advantages of CBC over ECB?
Dec
22
comment What are the advantages of CBC over ECB?
Arh... Ok, now I think I see it. I was thinking about the encryption as just being an XOR (or something else that commutes with XORing. In that case it wouldn't add anything, right?). Thanks for the answer.
Dec
22
comment What are the advantages of CBC over ECB?
Can't you just generate the second picture from the third? (assuming you know the block size and IV) I am not still sure that I understand.
Dec
22
asked What are the advantages of CBC over ECB?
Dec
21
reviewed Satisfactory Why is sharing the seed and using SecureRandom “deterministically” so bad?
Dec
21
reviewed Satisfactory Homomorphic (encrypted) comparison to an integer
Dec
21
reviewed Satisfactory Are there any differences in operation between existing Diffie-Hellman specifications?
Dec
21
reviewed Excellent Diffie-Hellman Secret Exponent Size and Shared Secret Usage
Dec
21
reviewed Needs Improvement Why send a challenge with CHAP?