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AES (Advanced Encryption Standard), known as (Rijndael) is a specification for the encryption of electronic data established by the national Institute of standards and technology (NIST) in 2001.
AES is a subset of the Rijndael cipher developed by two Belgian cryptographers, Vincent Rijmenam and Joan Dayman who have submitted a proposal to NIST during the selection process of AES.
Rijndael is a family of ciphers with different key sizes and blocks.
For AES, NIST selected three members of the Rijndael family, each of which has a block size of 128 bits, but three different key lengths: 128, 192 and 256 bits.
AES is currently used worldwide and supersedes the data encryption standard (des), which was published back in 1977.
The AES algorithm is a symmetric key algorithm, that is, the same key is used both to encrypt and to decrypt the data.