AES uses keys of 128, 192 or 256 bits, although, 128 bit keys provide sufficient strength today. Triple DES (aka TDES, TDEA, and 3DES) was a clever way of strengthening and extending DES by using double and triple length keys to drive three encryption rounds. Each of these rounds uses a different 128-bit round key, which is calculated from the original AES key. The Data Encryption Standard (DES / ˌ d iː ˌ iː ˈ ɛ s, d ɛ z /) is a symmetric-key algorithm for the encryption of digital data. Diethylstilbestrol (DES) is a synthetic form of the female hormone estrogen.It was prescribed to pregnant women between 1940 and 1971 to prevent miscarriage, premature labor, and related complications of pregnancy ().The use of DES declined after studies in the 1950s showed that it was not effective in preventing these problems. This has been demonstrated as early as 1998.. Cascading two or three instances of the algorithms, with distinct keys, is a fix which was easy to apply on hardware which already included some DES circuitry. and changed all DES / Triple DES and RC4 ciphers to enabled=0x00000000(0)
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