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Apr
14
comment Is Threefish the only cipher with 1024 bits of security?
I think the bitness is not directly comparable between symmetric and asymmetric ciphers.
Apr
12
comment Will the contents of a password protected Zip 2.0 file be safe for a week
@fgrieu I quoted you in full.
Apr
12
revised Will the contents of a password protected Zip 2.0 file be safe for a week
added 230 characters in body
Apr
11
answered Will the contents of a password protected Zip 2.0 file be safe for a week
Apr
5
awarded  Nice Question
Apr
4
comment How do I create a secure encryption scheme using addition?
Have you considered carry-less addition of the individual digits? This would be comparable to exclusive-or in base-2.
Apr
4
comment Purpose of DES parity bits
Thanks, also a good answer.
Apr
4
comment Does composing multiple substitution ciphers improve security?
Proof can be found from the group theory of permutations. A permutation group is closed under composition, meaning the product is yet another permutation, as claimed. en.wikipedia.org/wiki/Cyclic_permutation
Apr
4
answered How does SSL work on the browser
Apr
3
answered How would an attacker perform an exhaustive key search on a block cipher using ECB mode?
Apr
3
answered How to use the Extended Euclidean algorithm to invert a finite field element?
Apr
3
accepted Purpose of DES parity bits
Apr
3
comment A block cipher whose key changes after each block
Sounds like a stream-cipher
Apr
3
asked Purpose of DES parity bits
Apr
2
comment Password-based encryption with small typos allowed
Would it also work to concatenate the list of tolerable typos and let the hash of that be the key? Then to decrypt you'd generate the same list from the input password and hash it in the same manner to get the key.
Apr
2
comment Can error correcting codes be used to guess this plaintext?
The encryption operation is fixed and no effort is made to disrupt the particular encoding technique used by the "player". Conversely, the player is allowed to choose an encoding technique tailored to maximize recovery for that particular cipher. $p'$ is returned to the player, who should decode it using any means.
Apr
1
asked Can error correcting codes be used to guess this plaintext?
Mar
30
revised I homebrewed an algorithm. Is it secure?
added 113 characters in body
Mar
29
revised I homebrewed an algorithm. Is it secure?
Fix typo.
Mar
29
answered I homebrewed an algorithm. Is it secure?