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Aug
27
awarded  Popular Question
Jul
16
awarded  Custodian
Jul
16
reviewed Approve Difference between encrypting something and hashing something
Jun
22
answered Which symmetric cipher is best for studying?
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12
answered How a file is encrypted?
Oct
10
answered Is it possible to demonstrate that md5(x) != x for any x?
Oct
1
revised Why are we not using multiple ciphers per message?
edited body
Oct
1
answered Why are we not using multiple ciphers per message?
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18
awarded  Notable Question
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Apr
30
comment How do decryption algorithms determine whether your attempted passphrase is correct?
Did you see this question: crypto.stackexchange.com/questions/5921/…
Apr
17
accepted Security of permutation cipher
Apr
17
comment Security of permutation cipher
Arh.. ok. Now I see.
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 $\sigma_1$?