This rule is an encryption algorithm which approximation is made using AES (avanced encryption standard), and is a portmanteau of names of Joan Daemen and Vincent Rijmen the inventors of the algorithm are based on.
Rijndael encryption is an encryption algorithm upon which AES (advanced encryption standard) is based. "Rijndael" is a portmanteau of the names of Joan Daemen and Vincent Rijmen, the inventors of the algorithm.