What is AES? The Advanced Encryption Standard (AES) is a symmetric block cipher chosen by the U.S. government to protect classified information. AES is implemented in software and hardware throughout the world to encrypt sensitive data. It is essential for government computer security, cybersecurity, and electronic data protection . The National Institute of Standards and Technology selected three “flavors” of AES: 128-bit, 192-bit, and 256-bit. Each type uses 128-bit blocks. The difference lies in the length of the key. Being the longest, the 256-bit key provides the strongest level of encryption. With a 256-bit key, a hacker would need to try 2256 different combinations to ensure the right one is included. This number is astronomically large, landing at 78 digits in total. It is exponentially greater than the number of atoms in the observable universe . AES 128 uses 10 rounds, AES 192 uses 12 rounds, and AES 256 uses 14 rounds. The more rounds, the more complex the encryption, making AES 256 the most secure AES implementation. For securing data using symmetric key cryptography, Advanced Encryption Standard (AES) is one of the trusted cryptographic algorithms, which can resist conventional computers as well as quantum computers .