AES In 1999. nist issued a new standard that said BDES Should be used 168-bit key length Algorithm is the same as des 3DES had drawbacks Algorithm is sluggish in software Only uses 64-bit block size In 1997, NiST issued a calls for proposals for the new Advanced Encryption Standard(aes) security strength >=3DES improved efficiency must be a symmetric block cipher (128-bit key lengths of 128. 192 and 256 bits5 AES • In 1999, NIST issued a new standard that said 3DES should be used – 168-bit key length – Algorithm is the same as DES • 3DES had drawbacks – Algorithm is sluggish in software – Only uses 64-bit block size • In 1997, NIST issued a calls for proposals for the new Advanced Encryption Standard (AES) – security strength >= 3DES – improved efficiency – must be a symmetric block cipher (128-bit) – key lengths of 128, 192, and 256 bits