What is DES?

DES :

             The data encryption standard (DES) is a common standard for data encryption and a form of secret key cryptography which uses only one key for encryption and decryption public key cryptography(PKC) uses two keys i.e. one for encryption and one for decryption.DES uses a 56-bit key and uses the block cipher method which breaks text into 64-bit blocks and then encrypts then.