Bitcoin is a peer-to-peer electronic cash system that is completely decentralized, without the need for a central server or trusted parties. Users hold the crypto keys to their own money and transact directly with each other, with the help of a P2P network to check for double-spending.
Bork is a very small, cross-platform file encryption utility using a password-based RC4 algorithm. It is designed to be included in source code form along with the files it encrypts for long-term storage (eg on CD-R). Its minimal external dependencies are designed to make it fairly futureproof.
Caume Data Security Engine is a REST API platform for storing and processing files in uncontrolled environments. It provides a Free Software solution which allows the creation of reasonably secure and isolated workspaces to process and store sensitive data within uncontrolled environments. With concepts such as "the cloud" and "bring your own device", as well as an increasing demand for mobile devices, it has become clear that the way in which companies operate is changing dramatically, and, with it, the way in which we secure information and the infrastructure which supports business processes. CaumeDSE has been designed as a service platform which provides security to data by using free, well-known, and robust cryptographic software, as well as open and simple data structures and interfaces to make portability and extensibility easy.
cpm (Console Password Manager) is a small console tool to manage passwords and other sensitive data and store them in a public-key encrypted file. It also allows you to configure the whole hierarchy yourself, so it's easily adoptable for many requirements. The encryption is handled through GnuPG, and the data inside is stored as XML.
CryptoTE is a text editor with integrated strong cryptography. It is based on the popular Scintilla widget and automatically stores text data in secure encrypted container files. Compared to other "password keeper" programs, CryptoTE does not force any structure upon your data: it works with plain ASCII text and does not require you to fill in grids, key-value attributes, or descriptions. Encryption is transparently performed using the highly-secure Serpent cipher. The editing interface is thoroughly optimized for speed and ease of use. Multiple subfiles, Quick-Find, and a two-click random password generator make daily use very convenient.
DIIT provides a simple tool that can hide a message inside a 24-bit colour image so that knowing how it was embedded, or performing statistical analysis, does not make it any easier to find the concealed information. It also provides a framework for implementing other steganography algorithms for use in the tool.
EverCrack is a cryptanalysis engine. The overall design goal is to systematically break down complex ciphers into their simplex components for cryptanalysis (by the kernel). The kernel consists of an algebraic design (comparison and reduction) for breaking uniliteral, monoalphabetic ciphers instantaneously. Currently, it can break a 4000-word cipher in milliseconds. EverCrack currently has multi-language support for the user interface and cracking encryption in other language dictionaries (English, German, French, Spanish, Italian, Swedish, Dutch, and Portuguese).
Figaro's Password Manager 2 (FPM2) is a GTK2 port of Figaro's Password Manager, originally developed by John Conneely. It allows you to securely store your passwords, which are encrypted with the AES-256 algorithm. It allows you to copy passwords or usernames to the clipboard or primary selection. If a password is for a Web site, FPM can keep track of the URLs of your login screens and can automatically launch your browser. You can also teach FPM to launch other applications. FPM can sort your passwords into categories. Finally, it has a password generator that can help you choose good passwords.