Advanced Encryption Standard (AES)

Definition - What does Advanced Encryption Standard (AES) mean?

The Advanced Encryption Standard (AES) is a symmetric-key block cipher algorithm and U.S. government standard for secure and classified data encryption and decryption.

In December 2001, the National Institute of Standards (NIST) approved the AES as Federal Information Processing Standards Publication (FIPS PUB) 197, which specifies application of the Rijndael algorithm to all sensitive classified data.

Techopedia explains Advanced Encryption Standard (AES)

The AES has three fixed 128-bit block ciphers with cryptographic key sizes of 128, 192 and 256 bits. Key size is unlimited, whereas the block size maximum is 256 bits. The AES design is based on a substitution-permutation network (SPN) and does not use the Data Encryption Standard (DES) Feistel network.

In 1997, the NIST initiated a five-year algorithm development process to replace the DES and Triple DES. The NIST algorithm selection process facilitated open collaboration and communication and included a close review of 15 candidates. After an intense evaluation, the Rijndael design, created by two Belgian cryptographers, was the final choice.

The AES replaced the DES with new and updated features:

  • Block encryption implementation
  • 128-bit group encryption with 128, 192 and 256-bit key lengths
  • Symmetric algorithm requiring only one encryption and decryption key
  • Data security for 20-30 years
  • Worldwide access
  • No royalties
  • Easy overall implementation
Posted by:
How Can Analytics Improve Business Free Webinar

Connect with us

Techopedia on Linkedin
Techopedia on Linkedin
Tweat cdn.techopedia.com
Techopedia on Twitter


'@Techopedia'
Sign up for Techopedia's Free Newsletter!
Techwise Webinar Series
How Can Analytics Improve Business?
Register for this episode of TechWise to learn from two of the most experienced analysts in the business: Dr. Robin Bloor, Chief Analyst of The Bloor Group, and Dr. Kirk Borne, Data Scientist, George Mason University.

Email Newsletter

Join 138,000+ IT pros on our weekly newsletter