H12-311_V3.0 · Question #138
The length of the IV vector in the TKIP encryption method is () bits.
The correct answer is C. 48. TKIP (Temporal Key Integrity Protocol) uses a 48-bit Initialization Vector, making C correct. This was a deliberate expansion over its predecessor WEP, which used a 24-bit IV - that WEP value is why option B is wrong and a common trap for test-takers who confuse the two…
Question
The length of the IV vector in the TKIP encryption method is () bits.
Options
- A12
- B24
- C48
- D64
How the community answered
(19 responses)- A5% (1)
- B16% (3)
- C74% (14)
- D5% (1)
Explanation
TKIP (Temporal Key Integrity Protocol) uses a 48-bit Initialization Vector, making C correct. This was a deliberate expansion over its predecessor WEP, which used a 24-bit IV - that WEP value is why option B is wrong and a common trap for test-takers who confuse the two protocols. Options A (12 bits) and D (64 bits) do not correspond to any standard IV length defined in the IEEE 802.11i specification for TKIP. The 48-bit IV was critical to TKIP's design because the much larger keyspace dramatically reduces the risk of IV reuse, which was the primary vulnerability that allowed WEP to be cracked.
Memory tip: WEP uses 24 bits; TKIP doubled it exactly, giving 48 bits. If you remember "TKIP doubled WEP," you can derive 48 on the spot.
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