As the article says, Three-key Triple DES and all three AES variants are listed as Acceptable (which is the best rating used in SP800-131A) with no end date known at the time SP800-131A was written. Friday, July 19, 2013 - 2:57:20 PM - Prasad There are three keying options in data encryption standards: All keys being independent; Key 1 and key 2 being independent keys; All three keys being identical; Key option #3 is known as triple DES. In addition, there are variants of the CBC, CFB, and OFB modes of Triple DES that use interleaving or pipelining. The Triple Data Encryption Algorithm, alternately referred to as Triple DES (Data Encryption Standard), 3DES, TDES, Triple DEA, or TDEA, is a symmetric key-block cipher which applies the DES cipher in triplicate by encrypting with the first key (k1), decrypting with the second key (k2), and encrypting with the third key (k3). ; IDEA.IDEA's weak keys are identifiable in a chosen-plaintext attack.They make the relationship between the XOR sum of plaintext bits and ciphertext bits predictable. This means that the actual 3TDES key has length 3×56 = 168 bits. Testing Notes That is a 64-bit block cipher with a 56-bit key, just like DES. Triple DES: Triple DES is a encryption technique which uses three instance of DES on same plain text. The triple DES key length contains 168 bits but the key security falls to 112 bits. With the rise of triple DES, use of just one iteration of DES, as originally standardised, became known as single DES. Two-key triple-DES can be broken with a meet-in-the-middle (MITM) attack requiring 256 chosen-plaintexts (CPs), 256 memory and 256 single DES encryp-tions [12]. It is approximately twice as expensive to compute. Letter frequency analysis is one of the simplest forms of linear cryptanalysis. 2-key Triple DES (2TDES).Before using 3TDES, user first generate and distribute a 3TDES key K, which consists of three different DES keys K1, K2 and K3. Incidentally, there are two variants of Triple DES known as 3-key Triple DES (3TDES) and 2-key Triple DES (2TDES). Linear cryptanalysis is an approach where we aim to find affine approximations to the action of a cipher. gave rise to the two well-known versions of triple DES, one of which forms the main focus of this paper. For example, there are known loops in DES where, if you keep encrypting with the same key, you run around in a long loop. Triple DES (aka 3DES, 3-DES, TDES) is based on the DES (Data Encryption Standard) algorithm, therefore it is very easy to modify existing software to use Triple DES.It also has the advantage of proven reliability and a longer key length that eliminates many of the attacks that can be used to reduce the amount of time it takes to break DES. There are two variants of Triple DES known as 3-key Triple DES (3TDES) and . It uses there different types of key choosing technique in first all used keys are different and in second two keys are same and one is different and in third all keys are same. RC4.RC4's weak initialization vectors allow an attacker to mount a known-plaintext attack and have been widely used to compromise the security of WEP. DES, as detailed above. An additional test, the Multi-block Message Test (MMT) , is also required. We review in this section, previous attacks on variants of triple-DES and of DESX. 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