Triple DES (3DES) uses the DES cipher how many times?

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Multiple Choice

Triple DES (3DES) uses the DES cipher how many times?

Explanation:
Triple DES boosts security by applying the DES cipher three times to each data block. In practice, you perform DES encryption with the first key, then DES decryption with the second key, and finally DES encryption with the third key. If only two keys are used, the first and third keys are the same, so the process still involves three DES operations (EDE with K1, K2, K1). So DES is used three times.

Triple DES boosts security by applying the DES cipher three times to each data block. In practice, you perform DES encryption with the first key, then DES decryption with the second key, and finally DES encryption with the third key. If only two keys are used, the first and third keys are the same, so the process still involves three DES operations (EDE with K1, K2, K1). So DES is used three times.

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