Data Encryption Standard (DES)

 INTRODUCTION  Cryptography has remained into secure communication from ancient times to modern eons; it even transcended the simple substitution cipher, such as the Caesar cipher, up to the sophisticated algorithm cryptosystems of today's AES and RSA. The narrative of cryptography is explored in this blog with an emphasis on the powers and limitations of past ciphers, the cryptanalysis approaches that led to their demise, and the result of these early efforts towards present-day encryption standards. It shows how, by understanding this evolution, we are afforded some insight into the ongoing processes taking place in the contest between encryption and cryptanalysis and the need for good security in today's digital world. KEY SECTIONS 1. Historical Ciphers: The Foundation of Cryptography Caesar Cipher: A simple substitution cipher that introduced the concept of shifting letters. Vigenère Cipher:  A polyalphabetic cipher that improved security but was eventually ...

    Data Encryption Standard (DES) Abstract - The National Institute of Standards and Technology of the United States adopted Advanced Encryption Standard also known as AES in 1977 after it was developed by Optical and Electronic Enterprises in the 1970s. This symmetric key block cipher encrypts data blocks of 64 bits using a key of 56 bits. It is based on the IBM Lucifer cipher. Particularly in the public and private sectors, DES was widely used to protect a large number of classified sensitive documents. However, in 1970, the desk was still insufficiently used because it was easily cracked as a result of increased computer processing when a common 56-digit key standard was used. (1) Consequently, The Data Encryption Standard was slowly replaced by stronger encryption algorithms such as the Advanced Encryption Standard. I will summarize the history of the developing, the evolution, the multiple subkey and  permutations in this case. I will also provide details on the DES...