Discussion
The key length of a 3-key Triple Data Encryption Standard (3TDES) is :
Answer: D
The key length of 3-key Triple DES is 168 bits.
Triple DES applies DES three times (encrypt-decrypt-encrypt) with keys K1, K2 and K3. Each DES key has 56 effective bits (64 bits including 8 parity bits), so with three independent keys:
\[ 3 \times 56 = 168 \text{ bits} \]
112 bits is the 2-key variant, where K3 = K1. 256 and 512 bits are not Triple DES key sizes (256 bits is the largest AES key).
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