NullPoint is a high-performance, cross-platform file encryption and recovery demonstration tool. It is designed to illustrate industrial-grade cryptographic implementation, low-level optimization using Assembly, and secure system programming practices in C++ and C.

OPTIGA™ Trust M Host Library for C

Official KyotoTech SaQura SDK for Swift (iOS / macOS / tvOS / watchOS)

CRT Based Deterministic Factoring Algorithm and Implementation up to 130 bit Numbers

Post-Quantum Cryptography (PQC) and Classical Cryptography example applications to showcase the wolfCrypt Crypto algorithms running on dsPIC33A and dsPIC33C devices.

RSA (Rivest–Shamir–Adleman) Asymmetric Encryption Algorithm Implementation — Educational Purposes

Windows Secure Shell Client With Support For Smart Cards, Certificates, & FIDO Keys

Linux tools and examples for OPTIGA™ Trust V1/V3 security solution

Low-level cryptography implementations in C including RSA encryption, SHA-256 hashing, and custom big integer arithmetic, built from scratch with supporting data structures.

Secure image signing system using OP-TEE, SHA-256, and RSA-2048 with secure storage and REE verification.

Cryptographic primitives for OCaml, in OCaml (also used in MirageOS)

Microchip AVR based smartcard/token with ECC and RSA cryptography

Recovers RSA private keys from leaked CRT exponents (dp) found in sealbox crash logs, then decrypts RSA-OAEP ciphertexts. Supports raw hex, base64url chunks, and automatic JSONL crash log parsing.

$2 hardware SSH keys storage

Academic cryptography project implementing RSA encryption, decryption, digital signatures, and X.509 certificate verification in C using the OpenSSL BIGNUM (BN) library, bridging theoretical cryptography with real-world security applications (Information Technology Security, UNIWA).

Qrypt is a flexible and privacy-first app that allows users to manually encrypt, compress, and obfuscate text — designed for use cases when encryption doesn't exist, restricted or unavailable. Qrypt puts full control in the hands of the user, enabling secure message sharing across any medium (e.g., SMS, chat, email).

Blind RSA signatures for OpenSSL/BoringSSL.

这是一个PuTTY-CAC中文版，与PuTTY-CAC相同，是一个支持智能卡、证书和FIDO密钥的Windows Secure Shell客户端。更多详细信息，请访问PuTTY-CAC相关网站及说明。

C implementation of popular cryptographic algorithms like sha, des, rsa...

Cryptography Library from DannyNiu/NJF.