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Moderator♦ pro tempore on French Language, Computer Science and Software Recommendations. I'm also a unix amateur, and a developer with a computer science background and security leanings by trade.

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Avatar picture slightly adapted from a photo by Luridiformis (Zonda Grattus).


17s
comment how much will it cost me to encrpt apps and website?
@NeilSlater Evaluating the cost of implementing cryptography isn't fundamentally off-topic here. But this question is absolutely not answerable, here or anywhere. Evaluating such costs requires a lot of knowledge about the project. If you want a precise figure, you'll need to hire a consultant (which will cost a lot more than the cost of implementing what you need).
13h
reviewed Leave Open What is the technical name for a public key container in DER format?
13h
reviewed Close Is appending the hash of the plaintext to the end of an encrypted message sufficient to ensure integrity?
13h
reviewed Close Ciphertext-only cyptanalytic attack agianst the affine cipher?
13h
reviewed Close Are there cryptographic hash functions with homomorphic properties?
2d
reviewed Reviewed Using the same IV instead of random for CTR mode?
2d
reviewed No Action Needed Feasibility of finding public key when private key is known
2d
reviewed No Action Needed How to calculate kinv from the given k value
Sep
14
revised Regarding Key Strength with DES and Blowfish
edited tags
Sep
14
reviewed Reviewed Regarding Key Strength with DES and Blowfish
Sep
14
reviewed Close Why are we advising PKI if we know that quantum computers will break them?
Sep
12
reviewed Close stream cipher computation cost
Sep
12
comment How Could the Music Industry Go About Implementing Crypto?
A method similar to what? Along what lines? Please make your question self-contained apart from general knowledge about the subject. Don't assume that people have read a specific book or watched a specific video or the like.
Sep
12
comment Data I/O operations for encrypted files
Dmcrypt encrypts per block, not per file (it doesn't even know what a file is).
Sep
11
comment How can I know when a file was signed?
@KrNeki You can do that with a digital notary if at least some part of the notary is running in a tamper-resistant device in your possession.
Sep
11
comment How can I know when a file was signed?
@KrNeki Any solution between point 1 and point 2 requires that you authenticate to the notary, so that the notary knows that it is indeed you who did the signing. You can't authenticate by signing a message, but you could provide a second authentication factor such as biometrics. This is logistically demanding since this essentially requires physical presence with the notary.
Sep
11
answered How can I know when a file was signed?
Sep
11
reviewed Close Differential cryptanalysis of DES
Sep
11
reviewed Leave Open How can one generate pairs/triplets/…/n-ary MD5 collisions
Sep
11
comment How can one generate pairs/triplets/…/n-ary MD5 collisions
@JohnDeters No, finding collisions with no constraint on the messages is very different from finding collisions where one of the messages is imposed.