* FIPS 46-3: The official document describing the DES standard (PDF); An older version in HTML* COPACOBANA, a $10,000 DES cracker based on FPGAs by the Universities of Bochum and Kiel* DES step-by-step presentation and reliable message encoding application* A Fast New DES Implementation in Software - Biham* On Multiple Linear Approximations* RFC4772 : Security Implications of Using the Data Encryption Standard (DES)
==External links==*FIPS 46-3: The official document describing the DES standard (PDF); An older version in HTML*COPACOBANA, a $10,000 DES cracker based on FPGAs by the Universities of Bochum and Kiel*DES step-by-step presentation and reliable message encoding application*A Fast New DES Implementation in Software - Biham*On Multiple Linear Approximations*RFC4772 : Security Implications of Using the Data Encryption Standard (DES)