Advanced Encryption Components by TSM, Inc.  
   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 (withou
   http://www.crypto-central.com/

PC1 128-bit Stream Cipher  
   Implementation of the PC1 128-bit stream cipher algorithm in various languages. Freeware (even for commercial use) with Delphi source code.
   http://membres.lycos.fr/pc1/

Ciphersaber Home Page  
   Support crypto freedom by learning how to write your own strong encryption program. This site explains concept and implementation ideas.
   http://ciphersaber.gurus.com/

Triade Systems  
   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.
   http://triade.studentenweb.org/GInt/index.htm

Simple PGP Library  
   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.
   http://www.oz.net/~srheller/spgp/

Digital Keys Library  
   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
   http://www.ritlabs.com/dklib/index.html

efg's Cryptography and Math Functions  
   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.
   http://www.efg2.com/Lab/Library/Delphi/MathFunctions/Cryptography.htm

Delphi Cryptography Stuff  
   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.
   http://www.csd.net/~daves/delphi/

MD5.pas  
   An implementation of the MD5 algorithm for Borland Delphi 4 and higher. Includes source code and demo project.
   http://www.fichtner.net/delphi/md5.delphi.phtml

StreamSec StrSecII  
   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
   http://www.streamsec.com/

PGP Components for Delphi  
   Provide encoding and decoding, creating and verifying file detached signatures, key management functions (DH/DSS, RSA), keyserver functions, utilities. [Open source, MPL]
   http://idw-doc.homepage.t-online.de/PGPcomp.htm