Cybersecurity

Preprints and whitepapers from computer security researchers.

"A free C++ class library of cryptographic schemes."

"A question and answer site for software developers, mathematicians and others interested in cryptography."

"A secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them."

Open-source crypto APIs.

Known as Salt, this is one of the older encryption sites on the Internet. It features public-key cryptography, secret key cryptography, and low-level functions such as hashing and string comparison.

"A set of libraries designed to support cross-platform development of security-enabled client and server applications."

"A robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It is also a general-purpose cryptography library."

A Python cryptography toolkit.

A blog, with news, essays, academic papers, and video talks by cybersecurity expert Bruce Schneier.