DES: The oldest symmetric block key encryption algorithm

摘要

Cryptography is a part of Cryptology; which deals with reading, writing and breaking of code. Cryptography is a technique used to camouflage the message into some unreadable text. It is a way of ensuring security when transmitted through an insecure channel. An insecure channel is that channel, where unethical hacking, tampering of information is easily possible. Encryption is a process which enciphers the plain/original text into cipher text. Hackers will hack the data/information/message but will not be able to retrieve the original text because of encryption. This paper deals with one of the most famous and oldest symmetric key encryption algorithm “DES-Data Encryption Standard.” It highlights the primary flow, history, implementation, significant drawbacks, etc.