Introduction to Triple-DES
What do you mean by the term Triple-DES?
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For some time it has been ordinary practice to protect and transport a key for the DES encryption with triple-DES. This signifies that the plaintext is, in effect, encrypted three times. There are, obviously a range of ways of doing this; we will explore such ways below.
A number of modes of triple-encryption have been suggested:
DES-EEE3: Three DES encryptions with three distinct keys.
DES-EDE3: Three DES operations in the series encrypt-decrypt-encrypt with three distinct keys.
DES-EEE2 and DES-EDE2: Similar to the prior formats except that the first and third operations use the similar key.
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