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User Test

Environment

• Office environment: A private office, no person walking around the user.
• Cafeteria environment: A public cafeteria, people walk around the user or move chairs time to time.
• Participants utilize a iPhone 11 Pro Max to type secret numbers.

Experiment Procedure

• PIN inference experiment
• Step 1: Each participant configures a 6-digit PIN.
• Step 2: The participant memorizes/practices the PIN.
• Step 3: After the configuration, the user types the PIN while the attacker launches WINK.
• Step 4: For each environment, perform 100 attempts using different PINs.
• SSN inference experiment
• Step 1: Each participant selects a state, a corresponding 3-digit area code.
• Step 2: A valid 9-digit SSN is generated for the user.
• Step 3: The participant memorizes/practices the SSN.
• Step 4: The user types the SSN while the attacker launches WINK.
• Step 5: For each environment, perform 100 attempts using different SSNs.
• Performance metric
• Top-$k$ accuracy $\alpha$: The probability that the top $k$ guesses from the $N$ candidates return the candidates contain the typed number.
• $\alpha=\frac{\binom{1}{1}\cdot\binom{(N-1)}{(k-1)}}{\binom{N}{k}}=\frac{k}{N}$, where $\alpha = 1$ when $k > N$

Results

• Figure 14 in the paper presents average top-$k$ accuracy for PIN inference.

• Figure 15 in the paper presents average top-$k$ accuracy for SSN inference.

Download Links

• PIN CSI dataset
• [Download 1/2]
• [Download 2/2]
• SSN CSI dataset
• [Download 1/2]
• [Download 2/2]