Data Encryption Standard (DES) Algorithm Implementation

The Data Encryption Standard (DES) algorithm represents an efficient and secure data protection methodology implemented using MATLAB. As a symmetric-key algorithm, DES operates through multiple rounds of permutation and substitution operations applied to plaintext data using a cryptographic key. MATLAB's comprehensive function library and development tools facilitate the implementation of DES encryption/decryption processes through matrix operations, bit manipulation functions, and logical transformations. The algorithm implementation involves key generation through permutation choices, 16-round Feistel network processing using expansion permutations and S-box substitutions, and final permutation operations. Core MATLAB functions like bitxor(), bitshift(), and permutation matrices enable efficient bit-level operations required for DES implementation. This approach ensures the confidentiality and integrity of sensitive data, thereby safeguarding personal privacy and protecting business-critical information through robust cryptographic measures.