# Questions tagged [rsa]

an asymmetric (e.g. public-key) cryptosystem, based on modular exponentiation with big exponents and modulus. RSA can be used both for signature and encryption.

1,796 questions
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### How to calculate RSA group signatures

RSA group/ring signatures, how are they calculated?
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### Preferred SHA-2 hash algorithm for MGF1 in RSA

Does it make any difference to the security and efficiency if we use SHA-256 or SHA-512 for the Mask Generation Function MGF1 that generates the masking / padding within the OAEP encryption scheme and ...
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### Is this paper's technique for factoring RSA 2048 with noisy qubits realistic?

A paper titled How to factor 2048 bit RSA integers in 8 hours using 20 million noisy qubits has just come out which proposes a technique to factor RSA keys with moduli up to 2048 bits with a design ...
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### How would I get the issuer's public key from two RSA-signed certificates? [migrated]

I'm trying to get the issuer's public key from two SSL client certificates signed with a 2048-bit RSA key, SHA-256 hashing and PKCS#1 padding, as I only know the issuer's DN and I wish to verify all ...
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### What's the difference between RSA and Diffie-Hellman? [duplicate]

I've been reading on a lot of websites that same thing: RSA is for communication using the public and private key for both the server and client, where Diffie-Hellman is just for exchanging the same ...
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### RSA How to find the exponent ($e$) of the Public key with the values $p$ $q$ and an example are given

I'm wondering if it's possible to find the public exponent ($e$) with an example and the (rather small) values of $p$ and $q$ given. Currently the only option I found is bruteforcing this value, but ...
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### RSA Decryption, given $n$, $c$, and $e$ [on hold]

$c$ = ...
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### Picking 'e' for RSA encryption

What is the reason behind picking either $3$ or $2^{16}+1$ for generating the public key in RSA?
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### Is RSA inspired by Diffie Hellman?

I read a bit of A Method for Obtaining Digital Signatures and Public-Key Cryptosystems that introduced RSA in 1977, and, while learning the steps in RSA a few days ago, I noticed that they are similar ...
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Can someone explain why probabilistic padding like OAEP is particularly useful for avoiding Håstad’s Broadcast Attack? I don't really get the reason why.
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### PDP schemes parameter generation

For the PDP scheme, I need to generate the following parameter: g is a generator of Q (Q is the set of quadratic residues modulo N (N = pq is the RSA modulus) What algorithm can be used to generate ...
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### Can we write both encrypted text and plain text to the same file? [migrated]

We have a requirement from customer to write payment transaction information to a text file. Of many lines of data per transaction, only one line contains cardholder information, which needs ...
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### How to choose the integer m in the general number field sieve (GNFS)?

Given an integer you want to factor $N$, GNFS starts by selecting a monic irreducible polynomial $f \in \mathbb{Z}[X]$ and an integer $m$ such that $f(m) \equiv 0 \text{ mod } N$. In practice, if $m$ ...
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### Using One Time Pad and RSA compared to using only One-time Pad

Here I implemented One Time Pad first for only one time and then I used RSA algorithm to encrypt the message. For RSA algorithm, I pick p = 2143 and q = 3257 value which does not share any common ...
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### How can a message encrypted with the public key be decrypted with the private key?

I've been reading about encryption and have a basic understanding of the concept. What I don't understand, however, is how a calculation with one key can result in a number that, through calculation ...
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### is there any good implementation to the RSA in arduino ? c language [migrated]

I need a good implementation to the RSA algorithm that works on Arduino mega with key size 1024. the code will run on Arduino ide. the project idea simply is an android app send an encrypted message ...