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How to Encrypt & Decrypt Files with OpenSSL on Ubuntu and Mac OS X

OpenSSL is an open source library that provides a full-featured toolkit and APIs for secure computer network communication over Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols on Linux and other Unix-like systems

The source code of the project lives on GitHub and is managed by a worldwide community of software engineering volunteers with over 300 contributors.

Most network communication apps, personal computers, web servers, cell phone and tools that use TLS/SSL protocols have a version of OpenSSL installed on them.

The default toolkit of OpenSSL that comes with Ubuntu isn’t the latest. To get the latest, you must download it yourself and install. An older version will work with the tutorial as well. You do not need to upgrade to follow this tutorial.