Professional quality tools for adding symmetric (Blowfish, Twofish, and Rijndael) and public key encryption (Elliptic Curve, RSA) into Delphi and C++Builder applications, plus cryptographic hashes and copy protection software. Freeware components (without source) or commercial versions with Delphi source code.

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.

Implementations by Dave Shapiro of two symmetric encryption algorithms (Blowfish and DES) and several message digests (MD2, MD4, MD5, SHA-1, and RipeMD-160). Freeware with Delphi source code.

Win32 DLL written in Delphi with a set of high-level functions to encrypt text and/or add a digital signature. Utilizes RSA, IDEA, and MD5. Data packet and key format compatible with PGP, Slumberger, and Dekart. Freeware (source code in Delphi available for a fee).

Comprehensive 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 quality annotations.

An implementation of the MD5 algorithm for Borland Delphi 4 and higher. Includes source code and demo project.

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

Win32 DLL written in Delphi encapsulating important functions of the PGP for Windows API (versions 5.5 through 6.58). It exports a simplified interface with only "strings" and "integers". Freeware with Delphi 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, PCFB and ABC modes.

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.