Group works with industry and government towards the development of the Advanced Encryption Standard. Read an overview and recent announcements.

Provides an assortment of cryptographic tools for software developers. Includes links and a product catalog.

Software enables private parties to make connections over third-party networks like an extranet. Use the calculator to estimate possible savings.

Cambridge University offers technical papers from its computer science researchers on such topics as encryption standards and block ciphers.

Company specializes in commercial cryptography, including digital signatures and e-security software. Offers products for commercial banks and financial intermediaries.

Download Windows- or UNIX-based source code for a C implementation of this iterated block cipher algorithm. Plug in posted test values.

Find links to cryptography and find transposition ciphers.

MIRACL is a fast big-integer computation library for use in cryptography. Also offers factor.exe, which can factor integers of up to 80 digits.

TEA is a very small, efficient algorithm offering a moderate level of security. Read about the basics of the routine.