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).

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

pure-python ECDSA signature/verification and ECDH key agreement

Fastest 4KB JS implementation of secp256k1 signatures and ECDH

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

Audited & minimal JS implementation of elliptic curve cryptography.

Collection of pure Rust elliptic curve implementations: NIST P-224, P-256, P-384, P-521, secp256k1, SM2

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).

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

Cryptographic signature algorithms: DSA, ECDSA, Ed25519

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

JSON Web Token library

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.

Kotlin Multiplatform cryptography / crypto library

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

go 常用加密解密库/go encrypt or decrypt pkg（RSA/SM2/ECDSA/EC-GDSA/Gost/ElGamal/AES/DES/TripleDes/SM4/Tea/Twofish）

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.