资料介绍
This Application Note covers four encryption
algorithms: AES, XTEA, SKIPJACK
®
and a simple
encryption algorithm using a pseudo-random binary
sequence generator. The science of cryptography
dates back to ancient Egypt. In today’s era of informa-
tion technology where data is widely accessible,
sensitive material, especially electronic data, needs to
be encrypted for the user’s protection. For example, a
network-based card entry door system that logs the
persons who have entered the building may be suscep-
tible to an attack where the user information can be
stolen or manipulated by sniffing or spoofing the link
between the processor and the memory storage
device. If the information is encrypted first, it has a
better chance of remaining secure. Many encryption
algorithms provide protection against someone reading
the hidden data, as well as providing protection against
tampering. In most algorithms, the decryption process
will cause the entire block of information to be
destroyed if there is a single bit error in the block prior
to decryption. AN953
Data Encryption Routines for the PIC18
Author: David Flowers ENCRYPTION MODULE OVERVIEW
Microchip Technology Inc.
Four algorithms to choose from, each with their
own benefits
INTRODUCTION Advanced Encryption Standard (AES)
This Application Note covers four encryption - Modules available in C, Assembly and
algorithms: AES, XTEA, SKIPJACK and a simple Assembly written for C
encryption algorithm using a pseudo-random
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