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I like crypto. Need I say more?


7h
comment how much will it cost me to encrpt apps and website?
You need a bunch more information before we can answer. What are you trying to protect (information stored within the apps, or information transiting between the apps and the website) would be a good start.
1d
comment fuzzy commitment implemenation to make secure biometric template
This doesn't answer your question, but if I were you, I'd contact the authors and see if they can share their source code.
1d
comment fuzzy commitment implemenation to make secure biometric template
I updated the language in your question and added links to freely available versions of the paper. I hope I didn't change the original meaning. If I did, feel free to edit. I'll reopen and we'll see what the community here says.
1d
comment Encryption with data loss protection
Now, specifically what "security" pillars do you care about? The typical pillars we see are confidentiality (only who you say can have the book can have it), integrity (that the book hasn't changed), authenticity (that the book came from you, or that you are really the one who sent it to them).
1d
comment Encryption with data loss protection
What @poncho says is along the right track, but it sounds like you want your distributed book to be "error tolerant". In other words, if some parts of the file get corrupted, the person should still be able to read and verify it. Is that correct?
2d
comment ABE schemes viz., ciphertext-policy, key-policy implementation in Java
You are going to have to be more specific on what you mean by "I am looking for suggestion for below schemes in Java" for us to know if your request is on topic or not. Right now it still feels very much like a reference request and therefore off-topic.
2d
comment salsa20 is invertible, useless in CTR mode?
How exactly do you use salsa20 in block cipher CTR mode? Salsa20 is not a block cipher, it is a stream cipher.
2d
comment ABE schemes viz., ciphertext-policy, key-policy implementation in Java
Sorry, but reference requests are considered off-topic here. See if you can edit your question so it isn't just a simple request for references. You could focus on your desire for something simple. Do you have a simple ABE scheme in mind that you want to implement?
Sep
15
comment Discrepancy between RSA implementations
See my answer. That should fix it. Since this is a programming question, it is off topic on this site and should probably me migrated elsewhere. Stackoverflow would be a good place to migrate it to. Any thoughts?
Sep
15
comment Discrepancy between RSA implementations
Try encrypting something with two digits, say "11" or "12" and see if the discrepancy is there. If not, keep adding digits until it shows up. The JS algorithm seems to be doing some sort of packing that the Java library likely doesn't do.
Sep
10
comment Reverse engineering a custom hash function?
Reversing a hash by looking at input/output pairs is probably the worst way to go about the problem. You are much better off looking at the executable code (or the source if you have it). A reverse engineer with sufficient experience could probably do it in half a day.
Sep
9
comment Find pixel mapping matrix with minimum iterations
I would suggest we move this to another site. CS.SE might be a good one. I can check with the mods there if you would like.
Sep
8
comment Find pixel mapping matrix with minimum iterations
Is the reason you posted here because you view this as a sort of cryptographic operation that you want to invert and you are given black-box access to the algorithm?
Sep
6
comment How to prove Security of Onion Layers of encryption?
Haven't read it, but this might give some clues.
Sep
5
comment Higher residuosity problem, but with a known factorization
@Misty I migrated your question to math where I think (and hope) you will get an answer.
Sep
5
comment Can Bitcoin HD public keys be used for symmetric encryption?
@sylarmorgan If the keys are good, publishing i shouldn't matter. It is used in generating the public key, but there is (hopefully) enough additional entropy there that it wouldn't matter. For example, if I generated keys to encrypt messages to you as Hash(really_long_shared_secret || i) and sent to you i and a message encrypted with the key, the attacker knowing i doesn't help them very much. In the encryption, there are ways we could mess up (for example, this key generation is deterministic, so we would have to use good IV's as input to the block cipher, etc).
Sep
5
comment Higher residuosity problem, but with a known factorization
I think otus' point is, why post it here instead of on Math.SE
Sep
4
comment Is using SHA256 to extract entropy from a p-rand nonce a good way to create keying material?
+1 Always best to stick with standards.
Sep
4
comment Is using SHA256 to extract entropy from a p-rand nonce a good way to create keying material?
Personally, I'd use HMAC-SHA256. See this paper for why and some other possible constructions to consider (especially if your processor has AES-NI).
Sep
4
comment Can Bitcoin HD public keys be used for symmetric encryption?
Let me see if I understand. You have two parties who have previously shared (part) of a wallet. You want to use that shared information to establish secure communications between the two. Is that correct?