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Nov
11
comment Using bcrypt derived keys for encryption?
Why not just run bcrypt twice with a different salt?
Nov
11
comment Using bcrypt derived keys for encryption?
Do you have a reference for the 248-bit number?
Nov
11
revised Can RSA signing be implemented on top of RSA encryption/decryption?
deleted 220 characters in body
Nov
11
answered ASCII input to HMAC weaker than raw bytes?
Nov
11
answered Can RSA signing be implemented on top of RSA encryption/decryption?
Nov
11
comment Can RSA signing be implemented on top of RSA encryption/decryption?
@Vlix, there may be some details about MS CryptoAPI I don't understand. Technically if you MS CryptoAPI can compute $m^d\bmod{N}$ for some specially chosen $m$ (e.g. padding(sha256(your message))) then it may be possible. I'll leave this as is to see if someone else can comment.
Nov
11
comment Can RSA signing be implemented on top of RSA encryption/decryption?
Here are two questions and answers on this site that are related and you should understand: crypto.stackexchange.com/questions/12090/… crypto.stackexchange.com/questions/15997/…
Nov
11
comment openssl - Recommended way to encrypt and sign S/MIME messages using openssl
Take a look at this: security.stackexchange.com/questions/41399/…
Nov
11
comment Why is this cryptosystem insecure?
Hint: use GCD...
Nov
11
comment Why is this cryptosystem insecure?
It is hard to tell from the question what the math is. You can use TeX style formatting to clarify. Also, it is probably not wise to link to material that likely violates copyright law.
Nov
11
revised Encryption in which ciphertext is bigger than plaintext?
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Nov
7
comment recommendation to see documentaries about history of cryptography
Can't recommend a documentary but a book, Singh's The Code Book.
Nov
7
revised Which attacks are possible against raw/textbook RSA?
added 76 characters in body
Nov
7
revised Which attacks are possible against raw/textbook RSA?
added 76 characters in body
Nov
7
comment What is the value of Q such that Q|P-1 where P is a prime number?
I'm assuming $Q$ should be prime. If that is the exact wording of the problem, then it doesn't sound like it (though if that is the exact wording of the problem, then the problem is strange as $Q=1$ is an answer).
Nov
7
comment What is the value of Q such that Q|P-1 where P is a prime number?
BTW, there is a very simple answer that works for all primes but one.
Nov
7
comment What is the value of Q such that Q|P-1 where P is a prime number?
That notation means $Q$ divides $P-1$. In other words, divide $P-1$ by $Q$, is there a remainder, if so then $Q$ does not divide $P-1$, if not then $Q$ divides $P-1$.
Nov
7
answered Which attacks are possible against raw/textbook RSA?
Nov
7
comment Zero Knowledge Example using discrete log
BTW, please don't get discouraged by the down votes on the answer. I noticed in your profile that you are very interested in crypto. We are glad to have you here. Check out the Help Center to learn about the scope of this SE site.
Nov
7
comment Zero Knowledge Example using discrete log
@sayan, then you should state your assumption on computationally bounded adversary as "don't get any information" sounds like you are talking about information theoretic security (i.e., computationally unbounded)