02 Mar Practice Test Question – Keying Options
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Which one of the following keying options creates the most secure implementation of the 3DES encryption algorithm?
A. K1=K2, K2 is not equal to K3
B. K1, K2, and K3 are independent
C. K2=K3, K1 is not equal to K3
D. K1=K2=K3
Correct Answer: B
The most secure implementation of 3DES uses three independent keys. This approach creates a key with 168 (56×3) independent bits. When all three keys are the same, the key length is only 56 bits. When only two keys are independent, the key length is 112 bits.
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