Awesome GitHub RepositoriesCryptography Tools

Ciphey is an automated decryption tool and cryptographic analysis framework designed to identify and reverse encryptions, encodings, and hashes without requiring a known key or cipher. It functions as a hash cracking engine and a heuristic cipher identifier to recover original plaintext from unknown data patterns. The project features a nested encoding resolver that iteratively unwraps multiple layers of encryption and encoding until readable text is reached. It employs a heuristic cryptanalysis workflow to analyze data characteristics and guess the likely encoding scheme or encryption method

RsaCtfTool is a specialized cryptography suite designed for solving capture-the-flag challenges. It serves as a cryptanalysis and key recovery tool used to derive private keys and decrypt data from weak RSA public key implementations. The tool functions as an integer factorization toolkit, employing a variety of mathematical attacks and algorithms to decompose large composite numbers into their prime factors. It integrates with external prime number databases to accelerate the factorization process and identifies specific mathematical vulnerabilities in key generation. Its capabilities cover

JA3 is a standard for creating SSL client fingerprints in an easy to produce and shareable way.

rsatool can be used to calculate RSA and RSA-CRT parameters

A tool to analyze multi-byte xor cipher

An automated, modular cryptanalysis tool; i.e., a Weapon of Math Destruction

🔓 CLI tool and library to execute padding oracle attacks easily, with support for concurrent network requests and an elegant UI.

D(HE)ater is a proof of concept implementation of the D(HE)at attack (CVE-2002-20001) through which denial-of-service can be performed by enforcing the Diffie-Hellman key exchange. (read-only clone of the original GitLab project)

An MCP (Model Context Protocol) server that brings the capabilities of the enigmapython library to LLMs, allowing them to encrypt and decrypt messages using historically accurate Enigma machine emulators

Pure-Python MCP server for encoding, hashing, and crypto-primitives — computed for real, locally.