PyRsa

RSA (Rivest, Shamir and Adleman) is a cryptosystem based on factorization of big prime numbers. It is a nice and interesting application of modular arithmetic. It involves the Euler's totient function and generates a pair of key, a public one and a private one.

There are two main applications:

• Signature: Sign the message with the private key and then everybody can verify the signature with the public key.
• Encryption: Encrypt with the public key and decrypt with the private key.

PyRsa is a Python library that implements the entire RSA cryptosystem

• Easy: You can generate public/private keys, encrypt and decrypt in a few commands.
• Secure: The RSA algorithm is fully implemented avoiding security holes.
• Clear: The code is clear and easily readable, you can learn from it and make it totally yours.

Examples

from rsa import Rsa
rsa = new Rsa()
rsa.encrypt("public.key", "message.txt", "cypher.nop")
rsa.decrypt("private.key", "cypher.nop", "message.back")
import filecmp
assert(filecmp.cmp("message.txt", "message.back"))

This example encrypts and decrypt a message.

Installation

The library is a Python module and can be imported directly in your code.

License

PyRsa is made under the terms of the MIT license.