Support crypto freedom by learning how to write your own strong encryption program. This site explains concept and implementation ideas.

Implementations by Dave Barton of many of the most useful symmetric encryption algorithms (Blowfish, Twofish, IDEA, Rijndael, and Serpent) and message digests (RipeMD-160, SHA-1, and Tiger). Freeware with Delphi source code.

Provide encoding and decoding, creating and verifying file detached signatures, key management functions (DH/DSS, RSA), keyserver functions, utilities. [Open source, MPL]

Delphi implementation of XTea encryption algorithm and also utility for embedding encrypted strings into Delphi application.

Implementation of the PC1 128-bit stream cipher algorithm in various languages. Freeware (even for commercial use) with Delphi source code.

Implementations of FGINT (Fast Gigantic INTegers) and many asymmetric encryption algorithms (RSA, DSA, ElGamal, Elliptic Curve, EC-DSA, and EC-ElGamal). Freeware with Delphi and free pascal source code.

A collection of optimized cryptography components and routines for Delphi 4-6. The integrated ASN.1 support allows building of X.509 certificates using native Delphi code. Also implements 3DES, Twofish, and Rijndael (AES) in ECB, CBC, OFB, CFB, CTR, P...

A compilation of cryptography and high-precision math resources for Delphi (mirrored on Borland's website). Computer lab also features dozens of practical mathematics and graphics projects. Delphi source code with annotations.