One of the most widely used block cipher algorithms is
the Data Encryption Standard (DES), adopted in 1977
by the American National Standards Institute (ANSI).
After more than twenty years of use with continuous
aging due to advances in cryptography, the National
Institute of Standards and Technology (NIST) on Sep-
tember 12, 1997, started a process to stimulate the
development and submission of alternatives to the
DES. Twenty-one algorithms were analyzed in the first
round and five algorithms were analyzed in the second
round. On October 2, 2000 the NIST announced that
the new encryption technique, named Advanced
Encryption Standard (AES), would use the Rijndael
algorithm, designed by two well-known specialists,
Joan Daemen and Vincent Rijmen from Belgium. The
new AES will be used to protect sensitive information of
federal computer systems, as well as many private
businesses. AN821
Advanced Encryption Standard Using the PIC16XXX
FUNDAMENTAL ENCRYPTION
Author: Caio Gubel OVERVIEW
Microchip Technology Inc. Throughout history, mankind has faced the problem of
storing and transmitting sensitive information in a way
that could guarantee both reliable and easy access to
INTRODUCTION authorized persons and prevent undue and illegal
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