The Advanced Encryption Standard (AES) is a symmetric encryption algorithm that is widely used across the world to secure data. It was first standardized in 2001 by the US National Institute of Standards and Technology (NIST) and has since become one of the most widely used encryption algorithms.
AES uses a fixed block size of 128 bits and can use key sizes of 128, 192, or 256 bits. The algorithm uses substitution-permutation network (SPN) structure, in which data is processed in fixed-size blocks and undergoes a series of substitutions and permutations to scramble the data.
AES encryption is widely used in a variety of applications, including securing data transmission over the internet, encryption of sensitive information in databases, and in secure storage devices such as USB drives and memory cards.
The AES algorithm has been extensively analyzed and is considered to be highly secure, provided that the key is kept secret. However, it is important to use AES correctly and securely, as any weaknesses in the implementation or use of the algorithm can compromise the security of the encrypted data.