Briefly describe 3DES.
What will be an ideal response?
3DES (Triple DES) is the technique of encrypting plain text with DES and then taking the ciphertext and encrypting it again, with another DES key, and then taking the result and encrypting it yet again, with yet another DES key. The reader may ask why there is no such thing as Dexa DES, where the results are encrypted ten times. The answer is that each encryption takes time at both ends, and industry is unhappy to multiply the time spent encrypting and decrypting a document between three and ten times. Still, 3DES is faster than any secure asymmetric key algorithm.
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