AES is the successor of DES as standard symmetric encryption algorithm for US federal organizations. The AES is at least as strong as Triple DES and much faster. This is because there is one bit (the least significant one) in each byte assigned to create odd parity. From: stagda sys1 ic ncs com (Dave Stagner) Date: Thu, 13 Apr 1995 13:01:34 -0500 (CDT) As I understand it, triple-DES is not simply "three times stronger" than regular DES, but actually an order of magnitude stronger. The algorithm is believed to be practically secure in the form of Triple DES… Template:Infobox block cipher. Second variant of Triple DES (2TDES) is identical to 3TDES except that K 3 is replaced by K 1. It is vulnerable to key attack when a weak key is used. Triple DES: Triple DES is a encryption technique which uses three instance of DES on same plain text. In January 1999 distributed net and the Electronic Frontier Foundation (EFF) collaborated to publicly break a DES key in 22 hours and 15 minutes. If a 128 bit triple DES key is created the amount of effective key bits - the bits actually used in the protocol - is 112 bits. Triple DES will be kept around for compatibility reasons for many years after that. Each block is encrypted in isolation, which is a security vulnerability. AES is the default algorithm on most systems. It operates on 64-bit blocks of plaintext and uses a 128-bit key. Triple DES extends the key length of DES by applying three DES operations on each block: an encryption with key 0, a decryption with key 1 and an encryption with key 2. The key size is increased in Triple DES to ensure additional security through encryption capabilities. In cryptography, Triple DES (3DES) is the common name for the Triple Data Encryption Algorithm (TDEA) block cipher, which applies the Data Encryption Standard (DES) cipher algorithm three times to each data block. Triple-DES is the extended version of DES which applies DES three times with two 56-bit keys. Advantages: 1. its a 56 bit key. Triple DES has been endorsed by NIST as a temporary standard to be used until the AES was finished. AES uses keys of 128, 192 or 256 bits, although, 128 bit keys provide sufficient strength today. Triple Data Encryption Standard (DES) is a type of computerized cryptography where block cipher algorithms are applied three times to each data block. However double DES uses 112 bit key but gives security level of 2^56 not 2^112 and this is because of meet-in-the middle attack which can be used to break through double DES. Many security systems use both Triple DES and AES. The AES block cipher is rather more secure than triple DES. Strength of Triple-DES. This provides backwards compatibility with DES. Due to this design of Triple DES as an encrypt–decrypt–encrypt process, it is possible to use a 3TDES (hardware) implementation for single DES by setting K 1, K 2, and K 3 to be the same value. 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