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Impact of Different Influential Factors
Environment
- Imapct of environment
- Quiet environment: No movement around the user.
- Noisy environment: Other users walk around the user.
- Two antenna types for USRPs: Omni-directional (VERT2450) and directional antenna (LP0965).
- Imapct of keypad layout
- iOS passcode keypad
- 3x4 numberpad
- POS keypad
- Imapct of keypad size
- iPhone 11 Pro Max (6.5")
- iPhone 12 Mini (5.4")
- iPhone SE (4.7")
- Imapct of keyboard type
- Mechanical keyboard (Gigabyte Force K83)
- Ruber-dome membrane keyboard (DELL KB216T)
- Touch-screen (Lenovo Tab 4 10 Plus)
Experiment Procedure
- Step 1. Select 100 randomly selected 6-digit PINs.
- Step 2. For each environment/configuration, ask the user to type them, once per PIN.
- Step 3. Launch WINK and compute PIN entropy.
Results
- Table 2 in the paper presents PIN entropy under different environments.
- Figure 11 in the paper presents impact of keypad features (layout/size/type).
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