CodesInChaos

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bio	website	github.com/CodesInChaos
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Jabber/XMPP: CodeInChaos@jabber.ccc.de
IRC: CodesInChaos on freenode
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Blog: codesinchaos.wordpress.com
GitHub: github.com/CodesInChaos
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	5,954 reputation	bio	website	github.com/CodesInChaos	visits	member for	1 year, 10 months
1927 badges		location	Munich, Germany		seen	yesterday

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Oct 18	comment	How do you decrypt a ciphertext that is made up of special characters? A typical ciphertext consists of bytes and not characters. If you transformed it to characters you need to specify how you did that (with some kind of encoding). This is also a programming problem and not a cryptography problem, and thus off-topic here. Improve your question and ask on stackoverflow.
Oct 18	comment	How can I implement the “Multiplication Modulo” and “Addition Modulo” operations in IDEA? addition mod 2^16 can be achieved by using a 16 bit integer and simply adding. For most programming languages the overflow takes care of the modulo operation. (In c you need to use an unsigned integer to avoid undefined behavior)
Oct 16	awarded	Nice Question
Oct 16	reviewed	Approve suggested edit on Are there secure stream ciphers that cannot be parallelized?
Oct 15	reviewed	Approve suggested edit on Ways to protect flash player against MITM diffie hellman
Oct 15	comment	Ways to protect flash player against MITM diffie hellman How about just hardcoding the server's public key into the client? That prevents MitM. Or throw HTTPS at the problem.
Oct 13	comment	RSA encryption with private key and decryption with a public key That wording is a clear sign that somebody doesn't know much about asymmetric crypto.
Oct 13	comment	What happens to the entropy of a password when you hash it? @mikeazo You can calculate that using the number of output states(2^128) and the poisson distribution. The effect is negligible unless the input entropy approaches the output size.
Oct 12	reviewed	Edit suggested edit on Tunnels used in md5
Oct 12	revised	Tunnels used in md5 changed URL to a link; tried to clarify the last paragraph
Oct 12	reviewed	Approve suggested edit on Implementing AES encryption for firmware distribution system
Oct 12	reviewed	Approve suggested edit on Cryptanalysis of S-DES - Equations
Oct 12	reviewed	Approve suggested edit on Design criteria for AES
Oct 12	reviewed	Approve suggested edit on Simulation-based security?
Oct 12	comment	Why does Skein use an output transform, but other similar hashes don't? Part of the answer might be that the block-cipher in blake has twice the hash-size, whereas in skein they're equal.
Oct 12	comment	How is TrueCrypt in-place system drive encryption implemented? Live encryption doesn't sound that hard. You just need to keep track of which part of the harddisk you already encryption. The pass operations on these hard-disk parts though the encryption/decryption function, and have the operations on other parts of the disk bypass the encryption.
Oct 12	comment	How is TrueCrypt in-place system drive encryption implemented? This question isn't really related to cryptography, so unfortunately it's off-topic here.
Oct 11	comment	Encryption algorithm which produces comparable results for substrings I think it's easy to show that monoalphabetic substitution is the only kind of cipher that has this property.
Oct 11	comment	Stream ciphers based on discrete logs Do you know the concrete security claims of proof? For example for BBS, the non-tight reduction in the proof lead to a huge modulus that's practically unusable.
Oct 11	comment	Stream ciphers based on discrete logs Not directly DL based, but based on the related DH problem: Dual_EC_DRBG. The infamous backdoored PRNG.