10-07-2012, 12:49 PM
Advance Encryption Standard (AES)
AES.ppt (Size: 183 KB / Downloads: 40)
Advanced Encryption Standard was announced by the National Institute of Standards and Technology (NIST)
Selection criteria
define publicly
data block size is 128 bits, key block size can vary i.e. 128,192 or 256 bits in length
symmetric block cipher
variable key length
implementation on software and hardware
freely available
Evolution of AES
The Previous algorithms like DES were not secure enough after the inclusion of fastest computing technologies.
AES has key sizes of 128,192 and 256 bits which were higher than that of previous one.
No method exists to break the AES key even if a key is found @ 1 second, it would still take 149 trillion years to crack the 128-bit AES key.
AES Requirements
Symmetric Cipher
Block size must be at least 128 bits; keys of 128,192 and 256 must be applicable.
It should resist to all known methods of cryptanalysis
No Propriety
Design simplicity
Speed and code Compactness on a wide range of platforms.