Build a Python Wi‑Fi Scanner to Test Weak Passwords
This guide walks through setting up Python 2.7 with the pywifi module, preparing a dictionary of common Wi‑Fi passwords, configuring a scanner, scanning nearby hotspots, testing each network, and recording results to identify vulnerable access points.
Environment Setup
Python 2.7
pywifi module
Dictionary of passwords
Clear existing Wi‑Fi connection records
Import Modules
The script uses three modules; the _send_cmd_to_wpas method in _wifiutil_linux.py must be modified to suppress non‑OK replies.
Dictionary Preparation
A list of the top 10 weak Wi‑Fi passwords is prepared:
12345678
123456789
88888888
1234567890
00000000
87654321
66668888
11223344
147258369
11111111
Configure Scanner
Recommended scan interval is 15‑20 seconds; during testing it can be set around 15 seconds to balance speed and signal quality.
Scan Surrounding Hotspots
Hotspot Testing
Future work may store scan data in a database to avoid duplicate scans and improve visualization.
Case Study
The test used 11 weak passwords, discovered 20 hotspots, and then attempted to crack them. The result fields include:
WIFIID : hotspot ID, decremented each run
SSID OR BSSID : network name or MAC address
N : connection status
time : time spent
signal : signal strength (lower is better)
KEYNUM : password ID, decremented each run
KEY : current password being tested
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