Home Page

Firewalls

Email & Spam

Security Terminology

Security Topics

VPN & Cryptography

Wireless

 

 

 

VPN Terminology

VPN Tutorial Guide

3DES

AES

Aggressive Mode

Authentication Header

Asymmetric Encryption

Authentication

Certification Authority

Data Integrity

DES

Diffie-Hellman

Digital Certificate

Dynamic IP addresses

Encryption

ESP

IKE Oakley & ISAKMP

IPSec

IPSec Quick Mode

L2TP

Main Mode

MD5

NAT-T

PFS

PKI

Policy-vs-Route-VPN

PPTP

Pre-Shared Key

Remote Access User

RSA

Security Association

Sha-1

Site to Site VPN

SSL VPN

Transform Sets

Tunnel mode and Transport mode

VPN client tunneling option

VPN Topologies

VPN Tunnel

 

Security Products Guide

Which Anti-Virus Software?

Which Firewall?

Which Spam Filter?

Which Internet Security Suite?

 

What is Guide

What is a Firewall?

What is a Virus?

What is Spam?

 

Essential Security Guides

Securing Windows XP Guide

Securing Windows Vista Guide

A Guide to Wireless Security

 

Other

Top 8 Internet Security tips

Why both, Firewall and Anti Virus?

Free or purchased security - Which one?

 

 

AES 256 Bit Encryption Standard Tutorial

 

 

AES (Advanced Encryption Standard)

 

AES is a strong encryption algorithm used in symmetric key cryptography. The chosen algorithm behind the Advanced Encryption System label was the Rijndael algorithm. AES / Rijndael support different key lengths of 128, 192, and 256 bit key lengths. The longer the key length used the stronger and more difficult the encryption will be to break into. However using a 256 bit key to protect and encrypt data would also mean it will require more processing power and take longer to process.

 

Depending on the key lengths and block sizes AES produces a number of rounds of computation.

In a block and key size of 128 bits, there are 10 computation rounds.
In a block and key size of 192 bits, there are 12 computation rounds.
In a block and key size of 256 bits, there are 14 computation rounds.

 

AES became the replacement for 3DES and DES. DES in particular was found to be weak and breakable. AES is a popular encryption standard approved by the government and supported by all VPN vendors.

AES today is also used in removable media such as USB's and external hard drives. It is effective in both hardware and software and uses less memory than most other symmetric algorithms. Simply put, you can protect your data on your USB memory stick using encryption software running the AES algorithm. If an encrypted USB was stolen and in the wrong hands, data would be protected and would be in an un-readable format.

As well as AES, some other common symmetric encryption algorithms are DES, 3DES, blowfish, Twofish, IDEA, CAST, SAFER, Skipjack and RC.

Further Reading

Wikipedia's guide to AES (Advanced Encryption Standard)