Data Encryption Standard (DES) has a key length of 56 bits and can easily be broken. in fact,  it is not advisable to be used it in todays security .DES is a block cipher. It divides plaintext into 64-bit blocks and then executes the algorithm 16 times.

Advanced Encryption Standard (AES), uses keys that are 128 or 256 bits in length and yet AES has not been cracked. AES performs three steps on every block (128 bits) of plaintext. Within Step 2, multiple rounds are performed depending on the key size: a 128-bit key performs 9 rounds, a 192-bit key performs 11 rounds, and a 256-bit key, known as AES-256, uses 13 rounds. Within each round, bytes are substituted and rearranged, and then special multiplication is performed based on the new arrangement.