All Questions

[#not_a_crypto_expert] rather than forming the question by the techniques I'll describe the use case: I'm persisting blocks of sensitive binary data in a remote store, the communication is secure (...

We have a message denoted $M$. Let us suppose that we have a collision-resistant hash function $h_0$ with output length $n$. We then consider two other independent (different) hash functions $h_1$ and ...

My problem statement is as such: I have a file with columns and rows, and the whole file is encrypted File will be distributed, and depending on the recipient, the recipient may only require access ...

I am facing an impossible (?) problem but I'd like to find a solution that satisfies cryptographers and the users of my program. My program is able to sign a 'project' (bunch of files). For that I ...

All cryptographic algorithms I know of that satisfy Kerckhoffs's principle rely upon secure random number generation. Assuming the existence of a 'numerical oracle' capable of perfectly predicting the ...

From https://wiki.openssl.org/index.php/Manual:Enc(1): When a password is being specified using one of the other options, the IV is generated from this password. Why does OpenSSL do this? My ...

While (trying) to go over the reductions from approx. SVP on ideal lattices to search ring-LWE, [1] and [2], for $K = \mathbb{Q}(\zeta)$ where $\zeta$ is an abstract root of a cyclotomic polynomial, ...

Assuming we want to implement MPC protocol. Both FHE and Garbled Circuit(GC) can implement it. I wonder which primitive is more efficient in terms of computation time, bandwidth cost, and memory usage....

To my understanding a state is a $4 \times 4$ byte array used to store the plaintext. That equates to $128$ bits of data. To encrypt more than $128$ bits of data do I need to setup multiple of these ...

My question is about practical limit for brute force attacks. As I know 3DES with 56 bits key length can be broken via brute force. I also heard the same news about 64 bit key length (correct me if I ...

Section 4.1.1 "Finite Field Multiplication"(page 53) of "The Design of Rijndael", it states How the equation 4.1 has been formed and transformed into equation 4.2? In section 2.1.6 "Polynomials ...

Is ElGamal Algorithm can be used in sms/mms? If can, could you give me reference for that ? To be Truth, I want develop messaging android application for my final task and using ElGamal Algorithm, ...

From what I understand, in order for a curve to be safe, it would appear that $n$ being the order of the cyclic subgroup of the curve, is a prime. Also, it is the theoretical upper-bound on the number ...

Let $F$ be a pseudorandom function and $G$ be a pseudorandom generator with expansion factor $\ell(n)=n+1$. For each of the following encryption schemes, state whether the scheme has indistinguishable ...

How to implement the Rabin cryptosystem in python or java? what are all the built functions required for this? where can I get the code for it? And please suggest me a book for cryptographic functions ...