OpenVPN implements virtual private network (VPN) techniques for creating secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It uses a custom security protocol that utilizes SSL/TLS for key exchange. It is capable of traversing network address translators (NATs) and firewalls.

OpenSSL is an implementation of SSL/TLS.

OpenSSL is an implementation of SSL/TLS.

OpenSSL is an implementation of SSL/TLS.

Code to enable quantum-safe cryptography (QSC) in a standard OpenSSL (3.x) distribution by way of implementing a single shared library, the OQS provider.

OpenSSL is an implementation of SSL/TLS.

liboqs is an open source C library for quantum-safe cryptographic algorithms.

OCaml - Oxidized!

Libpng is the official PNG (Portable Network Graphics) reference library. It supports almost all PNG features and is extensible.

PHP (PHP Hypertext Processor) is a server-side (CGI) scripting language designed primarily for web development but is also used as a general-purpose programming language. PHP code may be embedded into HTML code, or it can be used in combination with various web template systems, web content management systems and web frameworks.

GD is a library for the dynamic creation of images by programmers. GD is written in C, and "wrappers" are available for Perl, PHP and other languages. GD creates PNG, JPEG, GIF, WebP, XPM, BMP images, among other formats. GD is commonly used to generate charts, graphics, thumbnails, and most anything else, on the fly. While not restricted to use on the web, the most common applications of GD involve website development.

Sagittarius is a R6RS/R7RS scheme implementation with features like built-in CLOS, Common Lisp like reader macro, cryptographic libraries, etc.

The SSH2 protocol implemented in OpenSSH is standardised by the IETF secsh working group and is specified in several RFCs and drafts. It is composed of three layered components:

The transport layer provides algorithm negotiation and a key exchange. The key exchange includes server authentication and results in a cryptographically secured connection: it provides integrity, confidentiality and optional compression.

The user authentication layer uses the established connection and relies on the services provided by the transport layer. It provides several mechanisms for user authentication. These include traditional password authentication as well as public-key or host-based authentication mechanisms.

The connection layer multiplexes many different concurrent channels over the authenticated connection and allows tunneling of login sessions and TCP-forwarding. It provides a flow control service for these channels. Additionally, various channel-specific options can be negotiated.

autossh is a program to start a copy of ssh and monitor it, restarting it as necessary should it die or stop passing traffic.

libfido2 provides library functionality and command-line tools to communicate with a FIDO device over USB, and to verify attestation and assertion signatures.

libfido2 supports the FIDO U2F (CTAP 1) and FIDO 2.0 (CTAP 2) protocols.

libssh2 is a library intended to allow software developers access to the SSH-2 protocol in an easy-to-use self-contained package. It can be built into an application to perform many different tasks when communicating with a server that supports the SSH-2 protocol.

The SSH2 protocol implemented in OpenSSH is standardised by the IETF secsh working group and is specified in several RFCs and drafts. It is composed of three layered components:

The transport layer provides algorithm negotiation and a key exchange. The key exchange includes server authentication and results in a cryptographically secured connection: it provides integrity, confidentiality and optional compression.

The user authentication layer uses the established connection and relies on the services provided by the transport layer. It provides several mechanisms for user authentication. These include traditional password authentication as well as public-key or host-based authentication mechanisms.

The connection layer multiplexes many different concurrent channels over the authenticated connection and allows tunneling of login sessions and TCP-forwarding. It provides a flow control service for these channels. Additionally, various channel-specific options can be negotiated.

autossh is a program to start a copy of ssh and monitor it, restarting it as necessary should it die or stop passing traffic.

HPN-SSH is a series of modifications to OpenSSH, the predominant implementation of the ssh protocol. It was originally developed to address performance issues when using ssh on high speed long distance networks.

libssh2 is a library intended to allow software developers access to the SSH-2 protocol in an easy-to-use self-contained package. It can be built into an application to perform many different tasks when communicating with a server that supports the SSH-2 protocol.

HPN-SSH is a series of modifications to OpenSSH, the predominant implementation of the ssh protocol. It was originally developed to address performance issues when using ssh on high speed long distance networks.

This package provides a module implementing PAM over U2F, providing an easy way to integrate the YubiKey (or other U2F compliant authenticators) into your existing infrastructure.

Symlinks scans directories for symbolic links and lists them on stdout. Each link is prefixed with a classification of relative, absolute, dangling, messy, lengthy or other_fs.

The Tcl (Tool Command Language) scripting language.