What Is the AES Encryption Algorithm?

The AES encryption standard is also known as the advanced encryption standard Rijndael encryption method. It is a 21st century encryption standard designed by the National Institute of Standards and Technology (NIST) to replace DES. The basic requirement of AES is to use a symmetric block cipher system, the key length can be 128, 192 or 256 bits, and the block length is 128 bits. The algorithm should be easy to implement on various hardware and software. In 1998, NIST began the first round of AES analysis, testing, and solicitation, resulting in a total of 15 candidate algorithms. ^[1]