Which of the following description about TKIP encryption is wrong?

Question

Options

• AThe IV length used in TKIP encryption is 24bits
• BTKIP encryption uses the same encryption algorithm as WEP encryption
• CThe motivation for developing TKIP encryption was to upgrade the security of legacy WEP
• DTKIP encryption adds Key generation, management and delivery mechanisms

• A
  73% (37)
• B
  4% (2)
• C
  16% (8)
• D
  8% (4)

Explanation

Option A is the false statement because TKIP uses a 48-bit Initialization Vector (IV), not 24 bits - the 24-bit IV was a known weakness of WEP that TKIP was specifically designed to fix by expanding the IV space and greatly reducing the risk of IV reuse. Options B, C, and D are all accurate: TKIP does use the RC4 cipher (the same underlying algorithm as WEP), it was created precisely to provide a security upgrade path for hardware that could not run the more robust AES-based WPA2, and it introduced per-packet key mixing along with key generation and management mechanisms absent in WEP. A useful memory anchor: think of TKIP as "WEP with a longer memory" - the doubled IV length (24 bits doubled to 48 bits) is the headline improvement, so any exam option that assigns TKIP the old 24-bit figure is describing WEP, not TKIP.

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