The RijnDael (pronounced Reign Dahl) algorithm was adopted in October 2000 as the Advanced Encryption System (AES) by the American National Institute of Standards and Technology (NIST).. This algorithm is a successor to what is currently used - the Data Encryption Standard (DES) which has proved to be crack-able, given enough computing resources.
The RijnDael algorithm was developed by two people - Joan Daemen and Vincent Rijmen, both experts in the cryptographic community. They own the trademark on it’s name too.
How Rijn Dael algorithm works?
The Rijndael algorithm is a new generation symmetric block cipher that supports key sizes of 128, 192 and 256 bits, with data handled in 128-bit blocks - however, in excess of AES design criteria, the block sizes can mirror those of the keys. Rijndael uses a variable number of rounds, depending on key/block sizes, as follows: