In the world of mobile technology, the Android operating system holds a dominant position, providing users not only access to apps but also deep interaction with the hardware. One of the most powerful tools for enthusiasts and information security specialists is the terminal emulator. TermuxThis application turns an ordinary smartphone into a portable Linux console, allowing you to run hundreds of packages and utilities previously only available on desktop computers.
Many users seek ways to penetrate other people's networks, but a professional approach requires studying security mechanisms and auditing methods. Termux Allows you to conduct legal analysis of visible networks, check your own access point for vulnerabilities, and study the operating principles of protocols WPA2 And WPA3It's important to understand that a phone without a dedicated external antenna and monitoring mode has limited packet interception capabilities, but it's indispensable as a training tool.
In this article, we'll explore the theoretical and practical aspects of using a terminal for network diagnostics. We'll examine which packages actually work in the Android environment, how to configure the environment, and what precautions to take. Please be aware that unauthorized access to someone else's Wi-Fi network is a criminal offense in many jurisdictions. All actions must be performed exclusively on your own equipment or as part of an authorized penetration testing (Pentest).
Before we dive into commands, it's important to understand the responsibility. Using your knowledge for malicious purposes can lead to serious legal consequences. Our goal is to educate and improve cybersecurity literacy, not teach hacking techniques. Let's take a look at how wireless communications work from the inside.
Installing and Basic Configuration of Termux
Getting started with the terminal on Android requires proper installation of the app itself. Standard versions from the Google Play Store are often outdated and don't allow full use of the repositories. For the latest version, we recommend downloading the APK file from the project's official GitHub repository. F-Droid or directly from the developers' website. After installation, the app will request a number of permissions that must be granted for the network modules to function correctly.
The first launch is the initialization of the base environment. You will be prompted to update package lists and install required dependencies. This process may take several minutes depending on your internet connection speed. Commands are entered by typing and pressing Enter, and the command is case-sensitive.
pkg update && pkg upgradeAfter updating the basic system components, it's necessary to install key networking utilities. These include package management tools, compilers, and Python libraries, as many modern scripts are written in this language. It's also worth installing a text editor, such as micro or nano, for editing configuration files directly in the terminal.
- 📦 Python — a programming language required to run most audit scripts.
- 🔧 Git — a version control system for downloading repositories from GitHub.
- 📝 Nano — a simple text editor for quickly editing configs.
- 🌐 Curl/Wget — utilities for downloading files from the Internet.
⚠️ Attention: Some Termux features related to accessing the Wi-Fi chip may not work on non-rooted devices. The standard Android API limits direct access to wireless card drivers.
Necessary tools and packages for analysis
Termux offers a suite of specialized packages for performing a comprehensive analysis of network infrastructure. The primary tool for working with wireless interfaces is Aircrack-ng, although its functionality on Android is often limited to scanning mode. Installing this kit requires running a command in the terminal, which downloads binaries and dependencies.
In addition to classic hacking tools, there are many passive information gathering tools available. For example, NetHunter Kali Linux offers advanced features but requires a more complex installation, often requiring a device reflash. For beginners, Termux offers a more suitable option: Python scripts that emulate network scanners.
pkg install aircrack-ngIt's important to note that the effectiveness of these tools directly depends on your smartphone's hardware. The built-in Wi-Fi modules of most phones don't support Monitor Mode, which is necessary for intercepting handshakes. Therefore, the primary focus is on analyzing open data and testing the strength of passwords if the hash has already been obtained using other methods.
☑️ Environment readiness
In addition to network utilities, it is worth paying attention to tools for working with traffic. Tcpdump Allows you to reduce packets and save them to a file for later analysis on a PC. This is a useful skill for understanding which data is transmitted in cleartext and which is protected by encryption.
Wi-Fi Operating Principles and Protocol Vulnerabilities
To understand how a network is protected or, conversely, compromised, it's important to understand the basic principles of the IEEE 802.11 standard. Wireless Fidelity uses radio waves to transmit data, and any receiver within range can theoretically receive these signals. Security is built on encryption methods such as WEP, WPA, WPA2 and new WPA3.
Historically, the most vulnerable protocol is WEP (Wired Equivalent Privacy). It uses static encryption keys that can be recovered by collecting a sufficient number of data packets. Modern networks use WPA2-Personal, which is based on a four-way handshake. It is during this data exchange that the password is verified, and if an attacker intercepts this moment, they can attempt to brute-force the password offline.
What is a handshake?
A handshake is the process of authenticating the client and access point. During this process, temporary encryption keys are generated. By intercepting this process, a hash can be obtained, which is then checked against a dictionary password.
The new WPA3 standard addresses many of the vulnerabilities of previous versions, introducing protection against brute-force attacks even when using weak passwords. However, the transition to new standards is slow, and many devices still operate on legacy protocols. Understanding these differences is critical for risk assessment.
- 🔓 WEP - completely hacked, use is prohibited.
- 🔐 WPA/WPA2 - vulnerable to dictionary attacks with weak passwords.
- 🛡️ WPA3 - high resistance, uses individual encryption.
- 📡 WPS — fast connection technology, often contains security holes.
⚠️ Attention: The WPS (Wi-Fi Protected Setup) protocol often allows you to recover your PIN code in a few hours by brute-forcing, even if the main Wi-Fi password is complex. It is recommended to disable WPS in your router settings.
Practical use of scripts for auditing
Since native Linux commands in Termux have limitations, the community has developed numerous Python scripts adapted to work through the standard Android API. One popular tool is Wifite (or its forks), which automates the scanning and auditing process. Running such scripts usually requires cloning the repository from GitHub.
git clone https://github.com/derv82/wifite2.gitcd wifite2
python setup.py install
When you launch the utility, you'll see a list of available networks within range. The script may prompt you to select a target network for analysis. However, as mentioned earlier, without the phone's chipset supporting monitoring mode, the capabilities will be limited to collecting information about the SSID, encryption type, and signal strength (RSSI). For actual testing, connecting an external USB Wi-Fi adapter via an OTG cable is often required.
When working with audit tools, it's important to be able to read the output. Color codes and statuses help you understand the current stage of the process. If you see the "Deauthing" status, this indicates an attempt to terminate the client's connection to the router in order to force a reconnection and capture the hash.
| Parameter | Description | Security implications |
|---|---|---|
| SSID | Wireless network name | Should not contain personal information |
| BSSID | MAC address of the access point | Used for filtering and attacks |
| Channel | Broadcast channel | Channel congestion reduces speed |
| Encryption | Encryption type | Must be WPA2 or WPA3 |
Protecting your own network from unauthorized access
Knowing how tools like Termux and Aircrack-ng, it's much easier to understand how to secure your own router. The first and most important recommendation is to avoid factory passwords. Devices issued by providers often have default combinations that are easily found online or in default databases.
Password length and complexity play a crucial role. Modern password-guessing methods utilize powerful graphics cards and databases containing billions of combinations. An 8-character password can be cracked in minutes, while a 15+ character password with special characters would require thousands of years of computation on modern hardware.
- 🔑 Use a password that is at least 12-15 characters long.
- 🚫 Disable the WPS function in the router's admin panel.
- 📡 Hide the SSID if you don't want the network to appear in the list (although this is weak security).
- 🔄 Update your router firmware regularly.
Guest access is also worth considering. Many modern routers allow you to create a separate network for guests. This isolates your visitors from the main local network, where your NAS storage devices, printers, and smart home devices may be located. Even if a guest device is infected, the main network will remain secure.
⚠️ Attention: Router settings interfaces are constantly being updated. The layout of menu items may vary depending on the model and firmware version. Always consult the official documentation from your device manufacturer.
Legal aspects and ethics in cybersecurity
The use of technical means to access information must be strictly regulated by law. Most countries, including the Russian Federation, have criminal code articles (for example, Articles 272 and 273 of the Criminal Code of the Russian Federation) that provide for this.
Ethical hacking (white hat) requires written permission from the system owner to conduct tests. Without such a document, any port scanning, traffic interception, or password guessing is illegal, even if you're doing it "just for fun" and causing no visible damage.
Termux's educational context allows for legal learning of commands, working with one's own equipment, and participating in CTF (Capture the Flag) competitions. These skills are highly valued by IT security employers but require an impeccable reputation.
FAQ: Frequently Asked Questions
Is it possible to hack Wi-Fi using Termux without root access?
Without root access, your capabilities are severely limited. You can scan networks and view their parameters, but the monitoring mode and packet injection required for a real security audit typically require deep access to the system and drivers.
Is it safe to install Termux from the Play Market?
No, the Google Play version is no longer updated by the developers. For the latest functionality, repository support, and security, we recommend downloading the APK from GitHub or F-Droid.
Which phone is best for Wi-Fi auditing?
The best results are achieved by devices with Broadcom chipsets that support monitor mode. However, most modern smartphones will require an external USB Wi-Fi adapter that supports Kali Linux.
What should I do if I forgot my network password?
If you have physical access to the router, the easiest way is to reset it to factory settings using the Reset button and configure it again. You can also view the password in the saved networks settings on an already connected Android smartphone (root or Android 10+ required).