What is the Triple Data Encryption Algorithm (TDEA)?

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What is the Triple Data Encryption Algorithm (TDEA)?

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The Triple Data Encryption Algorithm (TDEA) was proposed by Tuchman and first came into existence in functional applications in 1985. The Triple DEA algorithm uses three keys and executes the DES algorithm three times. It follows an encrypt-decrypt-encrypt (EDE) sequence as follows:

C = Ek3 [ Dk2 [ Ek1 [P] ] ]
Where
C = Cipher Text
P = Plain Text
Ek [X] = encryption of X using key K.
Dk [Y] = decryption of Y using key K.


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