I am trying to create an online database application using PHP for the server and C# form application for the client. On the server I encrypt a simple string using a public RSA key with the PHPSecL...

What is the recommended way of encrypting a short std::string into another std::string using the openssl C library (not the command-line tool of the same name) using a public keyfile, and knowing t...

I'm trying to generate address and create transaction using nodejs and @emurgo/cardano-serialization-lib-nodejs lib (CardanoWasm). Following the docs I'm trying this: const rootkey = CardanoWasm.Bi...

What is the best solution in C# for computing an "on the fly" md5 like hash of a stream of unknown length? Specifically, I want to compute a hash from data received over the network. I know I am do...

I wish to demonstrate asymmetric encryption using real-world locks. For example, I want to write a secret on a piece of paper and deposit it in a locked box. Is there a lock I can buy that comes wi...

I am trying to decrypt data using AES.GCM.The encrypted data works fine but when I try to decrypt the data using the same key it gives authentication error. Below is the code to decrypt func decryp...

i want to generate random int values using System.Security.Cryptography from 0 to 26 how can i do that ? i know can use system.random to do this but i want to use System.Security.Cryptography

I am working on both encryption methods and want to convert the ECDSA key to RSA key and vice versa.

I need to generate cryptographically strong random numbers and byte arrays. For this purpose, I'm using Java's SecureRandom class. But I'm not sure to choose which PRNG algorithm in terms of their ...

I am looking for a commutative cipher - that is E(K₁,E(K₂,P)) = E(K₂,E(K₁,P)) but is not associative - that is E(K,P) ≠ E(P,K) That rules out XOR, which otherwise would have been ok. A symme...

I need the Python code to extract from the p7s file the signature resulting from digitally signing a document, in both situations where the payload is inside of, and external to, the p7s file. I ha...

I'm familiar with basic cryptography in java But have zero experience in bouncycastle, Recently I came across a requirement that needs to read an encrypted and signed file from FTP. The sender has ...

I want to encrypt data using public/private key technique. I mean, encrypt with the public key of receiver and the receiver can decrypt with their own private key. How can I do that? Do you have ...

I've been reading this article on elliptic-curve crypto and how it works: http://arstechnica.com/security/2013/10/a-relatively-easy-to-understand-primer-on-elliptic-curve-cryptography/ In the arti...

I can successfully create an Hmac via NodeJS using the following code: (slightly altered example from : https://nodejs.org/api/crypto.html#cryptocreatehmacalgorithm-key-options) Crypto.createHmac('...

from cryptography.fernet import Fernet import base64 # Put this somewhere safe! key = Fernet.generate_key() f = Fernet() token = f.encrypt(b"A really secret message. Not for prying eyes.") token ...

Microsoft IP addresses are visiting 'broken' links on my web app after sending a valid link to one of their hosted email users. I have validated this after checking 6,924 Microsoft subnets against ...

I am looking into https://github.com/str4d/ed25519-java library as well as some other libraries like BouncyCastle, but I am so far unsuccessful in generating a public key out from a private key. I ...

I am generating a KeyPair for ECC from curve 'secp128r1' using openssl Steps I followed : first I generated a private key using the command openssl ecparam -genkey -name secp128r1 -noout -ou...

I am using Visual Studio 2013 (C#) to digitally sign document using certificate from smartcard. I cannot identify certificate currently inserted in the card reader :( Windows copy certificates fro...

I have to generate unique URL part which will be "unguessable" and "resistant" to brute force attack. It also has to be as short as possible :) and all generated values has to be of same length. I ...

code overview: The tokens are identical, but in between encryption and decryption, the encrypted object is stored into a module-level dictionary--still, the encryption token does not change. Why ...

I am generating a 2048-bit safe prime for a Diffie-Hellman-type key, p such that p and (p-1)/2 are both prime. How few iterations of Rabin-Miller can I use on both p and (p-1)/2 and still be confi...

We have configured a Java product to use only FIPS-validated RSA JCE crypto providers. However, the product won't work when only the RSA libraries are listed in java.security. Therefore, something ...

As far as I understand, RSA keys are usually generated based on a (strong) random generator. Instead, I want to create them based on a password. Or rather on its hash, for example sha512(sha512(...