PHP Secure Communications Library

The 'jsrsasign' (RSA-Sign JavaScript Library) is an opensource free cryptography library supporting RSA/RSAPSS/ECDSA/DSA signing/validation, ASN.1, PKCS#1/5/8 private/public key, X.509 certificate, CRL, OCSP, CMS SignedData, TimeStamp, CAdES and JSON Web Signature/Token in pure JavaScript.

Open-source implementation of a substantial portion of the API of Apple CryptoKit suitable for use on Linux platforms.

Rust implementation of {t,n}-threshold ECDSA (elliptic curve digital signature algorithm).

pure-python ECDSA signature/verification and ECDH key agreement

📡 An AX.25 packet radio chat protocol with support for digital signatures and binary compression. Like IRC over radio waves.

Automatically create and renew website certificates for free using the Let's Encrypt certificate authority.

Fastest 4KB JS implementation of secp256k1 ECDH & ECDSA signatures compliant with RFC6979

Collection of pure Rust elliptic curve implementations: NIST P-256, P-384, secp256k1

Audited & minimal JS implementation of elliptic curve cryptography.

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

A simple library to recover the private key of ECDSA and DSA signatures sharing the same nonce k and therefore having identical signature parameter r

Cryptographic signature algorithms: DSA, ECDSA, Ed25519

Crypt::LE - Let's Encrypt / Buypass / ZeroSSL and other ACME-servers client and library in Perl for obtaining free SSL certificates (inc. generating RSA/ECC keys and CSRs). HTTP/DNS verification is supported out of the box, EAB (External Account Binding) supported, easily extended with plugins, easily dockerized.

JSON Web Token library

A free, open-source, robust yet user-friendly, compact and cross-platform tool for OpenPGP encryption. It stands out as an exceptional GUI frontend for the modern GnuPG (gpg).

Compiler-free Python crypto library backed by the OS, supporting CPython and PyPy

Library for elliptic curves cryptography

Python library for fast elliptic curve crypto

Jwt Manager. Set of components to deal with Jwt Stuff. Automate your key rotating, add support for jwks_uri. Store your cryptography keys in a secure place.