Encryption Standard evaluation criteria among others
was [8],[9],[10],[11]:
• Security
• Software & Hardware performance
• Suitability in restricted-space environments
• Resistance to power analysis and other
implementation attacks.
Rijndael was submitted by Joan Daemen and Vincent
Rijmen.When considered together Rijndael’s
combination of security, performance, efficiency,
implementability, and flexibility made it an appropriate
selection for the AES.By design AES is faster in software
and works efficiently in hardware. It works fast even on
small devices such as smart phones; smart cards etc.AES
provides more security due to larger block size and
longer keys.AES uses 128 bit fixed block size and works
with 128, 192 and 256 bit keys.Rigndael algorithm in
general is flexible enough to work with key and block
size of any multiple of 32 bit with minimum of128 bits
and maximum of 256 bits.AES is replacement for 3DES
according to NIST both ciphers will coexist until the
year2030 allowing for gradual transition to AES.Even
though AES has theoretical advantage over 3DES for
speed and efficiency in some hardware implementation
3DES may be faster where support for 3DES is mature