PHP Secure Communications Library - Pure-PHP implementations of RSA, AES, SSH2, SFTP, X.509 etc.
PHP 5.3+ Fully-featured Authentication & Authorization System
Support for authenticating users using both OAuth1.0a and OAuth2 in Symfony2.
PHP 5.3+ oAuth 1/2 Library
Symfony Security Component
? Latte: the intuitive and fast template engine for those who want the most secure PHP sites. Introduces context-sensitive escaping.
A scanner to evaluate php.ini security
Permission handling for Laravel 5.4 and up
Secure PHP Encryption Library
Enhances the Symfony2 Security Component by adding several new features
Laravel 5 Captcha Package
Prevents installation of composer packages with known security vulnerabilities: no API, simply require it
A security checker for your composer.lock
PHP 5.4+ Fully-featured Authentication & Authorization System
Extra security-related features for Symfony: signed/encrypted cookies, HTTPS/SSL/HSTS handling, cookie session storage, ...
Laravel 5 HtmlPurifier Package
A flexible, driver based Acl package for PHP 5.4+
PHPIDS (PHP-Intrusion Detection System) is a simple to use, well structured, fast and state-of-the-art security layer for your PHP based web application
Nette HTTP Component
PHP Password Library: Easy, secure password management for PHP
A PHP security library
PHP CAPTCHA Library
A PHP library acting as a wrapper for PHP's default session handling functions which stores data in a MySQL database, providing both better performance and better security and protection against session fixation and session hijacking.