Cryptography
2.1 DES
Chapter 2 Symmetric Ciphers MSc. NGUYEN CAO DAT Dr. TRAN VAN HOAI.
CMSC 426/626 Notes
Modern Block Ciphers
Part II Chapter 2 Block Ciphers and the Data Encryption Standard
Cryptography and Network Security Chapter 3
Cryptography and Network Security
1 Block Ciphers (DES) Fourth Edition by William Stallings Lecture slides by Lawrie Brown (Changed by Somesh Jha)