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What Is OpenSSL?
Secure Sockets Layer (SSL) is an internet security protocol. It establishes encrypted connections between computers on a network, such as the internet. The OpenSSL Project dates back to 1998 to develop a free, versatile set of encryption tools for online use.
Amongst other things this includes open-source versions of both the SSL and TLS protocols. As the source code is freely available OpenSSL is supported on a number of platforms including Linux, macOS and Windows.
The core library (libssl) of OpenSSL is written in the C Programming Language. It’s designed to allow users to enable support for SSL/TLS in both client and server applications. This is useful for websites, messaging apps, and VPN services, including free VPNs.
The library relies heavily on OpenSSL’s comprehensive cryptographic library, libcrypto. This supports a huge number of algorithms including the industry standard Advanced Encryption Standard (AES). The libcrypto library also supports older encryption algorithms like Blowfish and Camellia.