NIST Special Publication 800-67

Citation
NIST, Recommendation for the Triple Data Encryption Algorithm (TDEA) Block Cipher, Ver. 1.1 (Special Publication 800-67) (May 19, 2008) (full-text).

Overview
This recommendation provides a description of a mathematical algorithm for cryptographically protecting binary coded information (e.g., using encryption and authentication). The algorithm described in this recommendation specifies cryptographic operations that are based on a binary number called a key.