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I like crypto. Need I say more?


Feb
6
comment Homomorphic encryption for vector addition
@uosɐſ, problem is I'm not aware of any existing systems that meet your needs. Specifically that it is deterministic.
Feb
5
comment Game with symmetric key
@user11818 updated. You have got to remember, we have no idea who you are. For all I know you know nothing about encryption, which is why I pointed out the obvious problem of using a really bad encryption method.
Feb
5
revised Game with symmetric key
added 594 characters in body
Feb
4
comment Game with symmetric key
If encryption is done properly, Bob cannot figure out an Rb1 that will decrypt to something intelligible.
Feb
4
answered Game with symmetric key
Feb
4
revised Game with symmetric key
deleted 2 characters in body
Feb
1
comment Cracking Stream Cipher
Try xoring two ciphertexts and look at the entropy. Also, to recover the encryption stream, xor the pt and ct. Then you could compare multiple encryption streams.
Jan
31
comment Homomorphic encryption for vector addition
It would seem that given encryptions of the 6 possible moves and say a starting position I could figure out all plaintext/ciphertext pairs (depending on the size of the space). Subtract the starting position from itself and you have $(0,0,0)$. Then use the 6 possible moves to enumerate other PT/CT pairs.
Jan
31
reviewed Approve suggested edit on Breaking a PRNG Scheme
Jan
31
comment Addition-only PHE in F#
@uosɐſ So what you are saying is you'd like to be able to encrypt 3 values at once so that operations on those will happen in parallel? Kind of like the SIMD work done in some of the FHE papers? If that is your question, I think you should pick a crypto system (paillier or exponential elgamal)then ask a separate question specifically relating to that system and how you would enable SIMD-like operations.
Jan
31
comment How do institutions like banks do RSA with big primes?
do you have any sources to back up your claim that banks do this (not saying you are wrong, just that a source would add credibility).
Jan
30
comment How do institutions like banks do RSA with big primes?
Do you mean 255 digits instead of 255 ciphers?
Jan
30
comment How do institutions like banks do RSA with big primes?
They use computers which have no problems working with large numbers.
Jan
30
comment Does re-iterate AES128 with different keys gives any benefict?
@AlexanderPD, what sort of attack are you worried about?To be honest, if I saw "double aes128 method" used in a real world system, I would run away from it as fast as I could. While the attacks might be theoretical, it does not follow good design principles from a cryptographic prospective. Chances are, whatever attack you are worried about can be mitigated using standard cryptographic processes and procedures (or perhaps by something else).
Jan
30
answered Using cryptographic hash to match AES key size
Jan
30
comment ASCII: weakness
Looks like this is basically ECB mode. Look up ECB mode weaknesses.
Jan
29
revised How to specify last $t$ bits are only sent when a signature is sent?
edited title
Jan
29
answered Does re-iterate AES128 with different keys gives any benefict?
Jan
29
revised Shamir's ID based signatures
deleted 31 characters in body
Jan
29
comment Shamir's ID based signatures
I'd suggest removing your PS and asking that as a new question.