Cryptography

Cryptography, or cryptology is the practice and study of techniques for secure communication in the presence of adversarial behavior. More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages.

GitHub: https://github.com/topics/cryptography
Wikipedia: https://en.wikipedia.org/wiki/Cryptography
Last updated: 2026-07-02 00:06:57 UTC
JSON Representation

https://github.com/codyverse/basex64

A simple cryptographic tool for storing data in distributed version control systems like Git.

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Last synced: 04 Feb 2026

https://github.com/pranjalco/caesar-cipher-simple

A Python program that implements the Caesar Cipher for encoding and decoding messages. Users can input text, choose shift numbers, and decide whether to encode or decode. Includes a user-friendly loop for multiple operations in one run.

algorithms cipher console-application cryptography python-programming security

Last synced: 30 Mar 2025

https://github.com/phenomsg/password-manager

It is a Python password manager using Fernet encryption. It securely stores and manages passwords, ensuring confidentiality and convenience for users.

cryptography decryption encryption fernet python

Last synced: 28 Dec 2025

https://github.com/csharper63/server_encryption_file_system

This repository contains a server that use symmetric encryption to encrypt user files/folders and asymmetric encryption to share files/folders among users.

asymmetric-cryptography cryptography end-to-end-encryption symmetric-cryptography

Last synced: 19 Jan 2026

https://github.com/quintessence-sec/pgp-mfa

proof-of-concept to use pgp as a MFA method

2fa benchmark cryptography golang gpg gpg-encryption mfa

Last synced: 03 Sep 2025

https://github.com/agnes-chong/owasp-juice-shop-vapt

Writeup for cryptography issue's vulnerability - forged coupon

cryptography ctf ctf-writeups owasp-juice-shop owasp-top-10

Last synced: 06 Feb 2026

https://github.com/onyazuka/desu

DES encryption + Triple DES + Multithread version

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Last synced: 25 Oct 2025

https://github.com/uofsc-fall-2022-math-587-001/homework3

Prime factorization and primitive powers mod p

cryptography go latex math

Last synced: 19 Apr 2026

https://github.com/dr4ks/natas_labs_solution

Hello, this is repository which has solutions for Natas Labs.

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Last synced: 23 Jan 2026

https://github.com/holasoymas/rsha

A sha256 hashing library implementation in rust

cryptography hashing rust rust-library sha256

Last synced: 25 Oct 2025

https://github.com/lightxlk/cryptanalyst_sysalt

Worked on an assignment of hex, ascii, and multiple cryptographic techniques.

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Last synced: 23 Jan 2026

https://github.com/zerdicorp/hashalgo

Second Attempt to Understand Hashing.

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Last synced: 02 Apr 2025

https://github.com/clats97/vigenerecracker

A simple python script that will crack the classical implementation of the Vigenere Cipher. It uses a word-list to brute force the correct key and NLTK to identify English words / sentences.

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Last synced: 26 Oct 2025

https://github.com/lorransutter/intro-bc-security-practices

Labs for BCDV1002 - Intro to Blockchain - Security Practices

blockchain cryptography ethersjs security security-practices smart-contracts solidity

Last synced: 02 Apr 2026

https://github.com/vallshmeleff/radiorandgentwo

A mock-up of a Java application that uses an Internet radio digital stream to encrypt SMS messages with Vernam's code. Works

cryptography

Last synced: 23 Jun 2026

https://github.com/loneicewolf/qubes-pentesting

Research on Qubes security. Includes my Progress on My own Attacks on Qubes as well.

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Last synced: 24 Jan 2026

https://github.com/kyj9447/pixseal

Cryptographic image integrity & authenticity verification tool. Detects any image modification via pixel-level validation.

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Last synced: 24 Jan 2026

https://github.com/sajad-net/handybar

Base64 encoder and decoder extension

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Last synced: 11 Apr 2026

https://github.com/casper64/hai

The 100% console based messaging program using the cryptography library in python; a project I made for my cryptograpghy course.

cryptography python sockets

Last synced: 19 Apr 2026

https://github.com/dubniczky/cryptography-algorithms

Python implementations of commonly used cryptographic algorithms

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Last synced: 23 Jun 2025

https://github.com/larueli/rsanf05utt

Chiffrement RSA en C dans le cadre d'un cours à l'UTT, école publique d'ingénieurs

c cryptography doxygen mathematics rsa utt

Last synced: 24 Jun 2026

https://github.com/crocs-muni/eanet

ANN version of EACirc

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Last synced: 31 Jan 2026

https://github.com/vaasudevans/ciphers

Implementation of Ciphers in C++ and python

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Last synced: 31 Mar 2025

https://github.com/projects-developer/blockchain-communication-system

A decentralized communication system built on blockchain technology, enabling secure, transparent, and tamper-proof exchange of information. Blockchain Communication System With Code, Documents, PPT, Report And Video

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Last synced: 25 Feb 2026

https://github.com/sug0/bbs-accum

Rust implementation of the accumulator commitment scheme described in https://eprint.iacr.org/2025/2081

accumulator commitment-schemes cryptography rust

Last synced: 01 Jun 2026

https://github.com/filiprokita/pwdgen

Simple command-line utility to generate a random password of specified length.

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Last synced: 07 Feb 2026

https://github.com/schlopp96/mycaesarcipher

Substitution-based cryptographic cipher for encoding plaintext. Works with alphanumeric characters.

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Last synced: 08 Feb 2026

https://github.com/magical/gimli

Go implementation of http://gimli.cr.yp.to/

cryptography

Last synced: 24 Mar 2025

https://github.com/seiyakobayashi/seiyakobayashi.github.io

Personal website for blogging

blockchain cryptography ethereum web3

Last synced: 08 Feb 2026

https://github.com/systemslibrarian/crypto-lab-lll-break

Browser-based LLL and BKZ lattice reduction demo — Gram-Schmidt orthogonalization, Lovász condition, step-by-step basis reduction animation, toy LWE primal attack, parameter explorer showing why Kyber's n=256 q=3329 survives while toy parameters fail instantly. The hardness assumption, made tangible. No backends. No simulated math.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/postquantum-jwt

PostQuantum.Jwt — Modern post-quantum hybrid JWT library for .NET 10 using X-Wing (X25519 + ML-KEM-768) and ML-DSA signatures.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-bike-vault

Browser-based BIKE demo — code-based post-quantum KEM using QC-MDPC codes, Black-Gray-Flip decoding, and side-by-side comparison against ML-KEM. NIST Round 4 alternate candidate. No backends. No simulated math.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-kdf-chain

Browser-based KDF demo — HKDF, PBKDF2, scrypt, and Argon2id compared side by side with live parameter tuning, real timing measurements, and a KDF decision tree. No backends. No simulated math.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-mac-race

Browser-based MAC demo — HMAC, CMAC, Poly1305, and GHASH compared with live length extension attack, timing attack, and nonce reuse demonstrations. Real WebCrypto operations. No backends. No simulated math.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-paillier-gate

Browser-based Paillier cryptosystem demo — Pascal Paillier's 1999 additive homomorphic encryption. Encrypt, decrypt, homomorphic addition without decrypting. Private 10-voter election simulation and 5-hospital patient aggregation. The primitive underlying GG20 threshold ECDSA, Helios voting, and ElectionGuard. No backends. No simulated math.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-iron-serpent

Browser-based demo of Serpent-256, the AES finalist with the largest security margin — featuring encrypt/decrypt, round comparison visualization, and live performance benchmarks

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-padding-oracle

Browser-based CBC padding oracle attack demo — full Vaudenay 2002 chosen-ciphertext attack with real AES-CBC, byte-by-byte plaintext recovery, and coverage of ASP.NET, Lucky Thirteen, and POODLE exploits. No backends. No simulated math.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-dead-sea-cipher

Browser-based cryptographic history demo — from Atbash in Jeremiah 25:26 (~600 BCE) to AES-256-GCM (2001 CE). Every cipher, every fatal flaw, every lesson that built the next one.

aes-gcm atbash caesar-cipher cryptography frequency-analysis historical-ciphers kasiski one-time-pad vigenere-cipher webcrypto

Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-rsa-forge

Browser-based RSA demo — textbook RSA, OAEP, PSS signatures, and live attacks including small exponent, Bleichenbacher PKCS#1 v1.5 oracle, and padding oracle. Real WebCrypto operations. No backends. No simulated math.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-ratchet-wire

Browser-based demo of the Double Ratchet Algorithm — the cryptographic protocol powering Signal, WhatsApp, and Google Messages. Live conversation with forward secrecy, break-in recovery, and key compromise simulation.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-patron-shield

Browser-based demo of two-server Information-Theoretic Private Information Retrieval (IT-PIR) — applied to library catalog privacy. Because patrons deserve mathematical guarantees, not just policy promises.

crypto-compare cryptography information-theoretic-security library-privacy pir private-information-retrieval xor

Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-model-breach

Browser-based HiAE threat model case study — AESL, Theorem 1 candidate enumeration, MITM state recovery, byte decomposition, guess-and-determine key recovery. Security claims are contracts. The threat model is the fine print. No backends. No simulated math.

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Last synced: 01 Jun 2026

https://github.com/systemslibrarian/crypto-lab-dilithium-seal

Browser-based demo of ML-DSA (CRYSTALS-Dilithium), the lattice-based post-quantum digital signature scheme standardized as NIST FIPS 204 in August 2024. Sign, verify, and seal documents — quantum-resistant.

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Last synced: 01 Jun 2026

https://github.com/devehab/cryptotools

An educational cryptography toolkit in Arabic that provides hands-on learning for various cryptographic concepts including wallet generation, encryption/decryption, hashing, and digital signatures. All operations are performed client-side for maximum privacy and security.

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Last synced: 09 Feb 2026

https://github.com/ttwag/mat115a-number_theory

Number Theory

cryptography math number-theory proof

Last synced: 26 Feb 2026

https://github.com/edoars/public-key-crypto-notes

LaTeX notes (in italian) for the undergraduate Public-key Cryptography course at University of Roma Tre

cryptography latex-notes math notes public-key-cryptography

Last synced: 10 Feb 2026

https://github.com/abund4nt/h3xtel-scripts

Repository with solution and explanation of the challenges of the H3xtel course.

cryptography ctf mathematics python

Last synced: 24 Mar 2025

https://github.com/smallstep/pem-key-wrap

🔐 Wrap PEM files using RSAES-OAEP with SHA-256 + AES-KWP

cryptography kms pem wrap

Last synced: 27 Feb 2026

https://github.com/stillouyng/crypto_playground

🔐 Crypto Playground – educational project for analyzing encryption algorithms.

cryptography educational low-level rust

Last synced: 18 Apr 2025

https://github.com/aryaghan-mutum/algorhythms

A curated collection of algorithm implementations.

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Last synced: 21 Feb 2026

https://github.com/adhupraba/fshare

FShare is a secure and robust file-sharing application that enables users to upload, share, and manage encrypted files.

cryptography django django-rest-framework encryption-decryption file-sharing reactjs security

Last synced: 12 Feb 2026

https://github.com/seniorbatleo/cryptocart

Secure chat software for your computer.

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Last synced: 24 Jun 2026

https://github.com/thecolonycc/attestation-envelope-spec

Cross-platform attestation envelope spec for agent-native claims. Pointer-based evidence, custodian-signed coverage metadata, sigchain over a typed witnessed claim.

agent-identity agent-security ai-agents attestation colony cryptography ed25519 json-schema provenance specification thecolony verifiable-credentials

Last synced: 24 Jun 2026

https://github.com/rub-nds/ssh-strict-kex-violations-state-learning-artifacts

Artifacts for the paper "Finding SSH Strict Key Exchange Violations by State Learning", accepted at the ACM Conference on Computer and Communications Security (CCS) 2025.

artifacts attack cryptography cve-2025-32433 cve-2025-32942 ssh statelearning strict-kex vulnerability