What is triple encryption

Explain the term triple encryption?

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Tuchman suggested a triple encryption method which uses only two keys [TUCH79]. The function follows an encrypt – decrypt – encrypt (EDE) sequence.

C=Ek1 [Dk2 [Ek1 [P]]]

There exists no cryptographic importance to the use of decryption for the second stage. Its advantage includes that it enables the users of 3DES in order to decrypt the data encrypted by the users of older single DES:

C=Ek1 [Dk2 [Ek1 [P]]] = Ek1 [P]

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