In the age of total digitalization, wireless internet access has become as essential as electricity or water. However, by leaving the network open or using weak passwords, users often fail to realize the risks they expose to their personal data. Hacking someone else's Wi-Fi — this is not just a way to get free traffic, but also a serious violation of the law that can entail liability.
Modern smartphones have sufficient computing power and a set of tools that, theoretically, allow for network security audits. It's important to understand the difference between malicious intrusion and ethical hacking, aimed at identifying vulnerabilities in your own infrastructure. In this article, we'll examine the technical aspects of security protocols and the ways attackers can gain access to your network.
Knowing attack mechanisms is the best way to protect yourself. Many router owners don't even realize their device could be vulnerable to attacks like Brute-force or Man-in-the-MiddleUnderstanding how encryption works will help you configure your equipment to make interception of your data as difficult or impossible as possible for unauthorized individuals.
⚠️ Warning: Any testing of other people's networks without the owner's written permission is illegal. This information is provided for educational purposes only to improve your cybersecurity.
How Wi-Fi network encryption works
Wireless security is based on encryption protocols that transform transmitted data into unreadable code. The oldest standard WEP Wired Equivalent Privacy (Wired Equivalent Privacy) was deprecated many years ago due to critical vulnerabilities in the key generation algorithm. Cracking this encryption from a phone takes just minutes, even for beginners.
It was replaced by a protocol WPA, and then its improved version WPA2, which uses the more secure AES algorithm. This standard is currently the most common in home and office networks. However, it is not without its weaknesses, especially if the password consists of simple words or short character combinations.
The latest standard WPA3 Implements additional layers of protection, such as individual data encryption for each connected device. This makes intercepting traffic, even on an open network, virtually useless for an attacker. Switching to this protocol is an important step, but it requires support from both the router and client devices.
The authentication process, known as the "handshake," occurs when a device connects to an access point. This key exchange is often a target for interception. If an attacker manages to capture the handshake data packet, they can attempt to brute-force the password offline using powerful computing resources.
Technical requirements and preparation of the smartphone
To conduct a full-fledged security audit or, in the worst case, an attack, the standard set of apps from the Play Market will not be sufficient. Operating systems Android And iOS have strict restrictions on access to the Wi-Fi module, prohibiting the network card from being switched to monitor mode without special rights.
The key requirement is the presence of Root rights (superuser) credentials on an Android device. Without them, no app can send the necessary data packets or scan the air for hidden networks. On Apple devices, the situation is even more complicated: iOS almost completely blocks low-level access to the network interface.
- 📱 Root rights: necessary for deep intervention in the operation of the network card.
- 📡 Monitor mode: Allows the card to receive all packets in the air, not just those addressed to your device.
- 🔋 External adapter: Often, built-in phone modules do not support packet injection, requiring the connection of a USB-Wi-Fi adapter via OTG.
It's important to note that using third-party firmware or gaining root access voids the device's warranty and may lead to unstable operation. Furthermore, many banking apps stop functioning on rooted devices due to the risk of data compromise.
⚠️ Warning: Installing unverified jailbreak apps can infect your phone with viruses or steal your personal data. Be careful with software sources.
Password guessing methods and brute-force attacks
One of the most common ways to gain access to a network is the brute force method, or Brute-forceThe method involves automatically trying millions of password combinations until the correct one is found. The effectiveness of this method directly depends on the password complexity and the speed of the brute-force attack.
There are specialized applications that use pre-prepared dictionaries of the most common passwords. These dictionaries can contain millions of combinations commonly used by people: dates of birth, names, simple sequences of numbers. If the network owner used a password 12345678 or password, access will be obtained instantly.
To protect against such attacks, it's critical to use long and unique passwords. It can take several hours to crack an 8-character password, while a 12-character password with mixed case and special characters would require thousands of years of computation on modern hardware.
| Password type | Length | Selection time (approximate) | Risk level |
|---|---|---|---|
| Just numbers | 8 characters | A few seconds | Critical |
| Lowercase letters | 8 characters | A few hours | High |
| Mixed case + numbers | 10 characters | Several years | Short |
| Special characters + all above | 12+ characters | Thousands of years | Minimum |
Some modern routers offer protection against brute-force attacks by blocking the password after several unsuccessful attempts. However, this protection only works when connecting directly to the router's interface, not when attempting to connect via Wi-Fi, where the handshake can be intercepted a limited number of times.
What are Rainbow Tables?
Rainbow tables are pre-computed hash tables that allow you to instantly find the original password based on its hash if it exists in the database. This speeds up cracking by thousands of times, but requires a huge amount of memory to store the tables.
WPS vulnerabilities and automatic connection
Technology WPS (Wi-Fi Protected Setup) was created to simplify connecting devices to the network by simply pressing a button or entering a PIN. Unfortunately, the implementation of this feature contains a fundamental vulnerability that makes it possible to brute-force the PIN in a matter of hours.
The WPS PIN consists of 8 digits, but the last digit is a checksum. This reduces the brute-force attack space to 7 digits. Furthermore, the protocol verifies the first 4 digits and the second 3 digits separately, reducing the number of attempts required to several thousand. Specialized apps can automate this process.
If WPS is enabled on your router, your network is vulnerable even with a complex password for your primary Wi-Fi network. An attacker can recover your network password with the PIN. Therefore, the first step in protecting your network should be to completely disable WPS in your router settings.
- 🔓 Protocol vulnerability: The WPS design does not provide protection against brute force attacks.
- ⏱ Time to attack: it takes from 2 to 10 hours depending on the router's response speed.
- 🛡 Method of protection: completely disable the WPS function in the device's admin panel.
There is also a method of attack known as Pixie DustIt exploits errors in the random number generator implementation in chips from some router manufacturers (e.g., Realtek, Ralink). In such cases, bruteforcing a PIN code takes just seconds, as the algorithm is predictable.
⚠️ Note: Router settings interfaces may vary. Look for the "Wireless," "WPS," or "QSS" sections to disable this feature. If there is no option to disable it, a firmware update may be required.
Man-in-the-Middle Attacks
A more complex and dangerous method of compromising a network is an attack Man-in-the-Middle (MitM). In this case, the attacker doesn't necessarily crack the Wi-Fi password, but rather creates a fake access point with a name identical to the legitimate network (Evil Twin).
The victim's device, seeing a familiar network name with a stronger signal, can automatically connect to the rogue router. All user traffic then passes through the attacker's device, which can intercept logins, passwords, and personal correspondence if the connection isn't secured. HTTPS.
To implement such an attack, tools like Aircrack-ng or WiFite, which often require installation via an Android terminal. They allow deauthentication of clients—forcibly disconnecting devices from the legitimate router, forcing them to reconnect to the fake network.
☑️ Network security check
Protecting against such attacks is difficult, as they exploit the device's trust in a known network name. Users should be vigilant and check website security certificates, especially when entering sensitive data in public places.
Security audit software
Among information security professionals, there is a set of tools that is considered a de facto standard. Based on Linux (for example, the distribution Kali Linux) these tools work most effectively, but there are also adaptations for mobile platforms.
One of the most famous tools is the package Aircrack-ngThis is a set of utilities for monitoring, attacking, testing, and hacking Wi-Fi networks. It includes airmon-ng to switch the card to monitor mode, airodump-ng to capture packets and aireplay-ng for injection of packages.
airmon-ng start wlan0airodump-ng wlan0mon
aireplay-ng --deauth 10 -a [MAC_router] wlan0mon
For mobile devices, there are shell applications such as Kali Nethunter (requires complex installation) or simpler utilities like WPS Connect And Fritz!App WLANHowever, their functionality is often limited by the capabilities of a specific smartphone and the lack of injection drivers.
Using these tools requires a thorough knowledge of network protocols. Incorrect use of commands can cause the network module to freeze or require a device reflash. Beginners are advised to begin their learning process with virtual labs.
How to protect your network from hacking
Understanding attack methods allows you to develop an effective defense strategy. The first and most important step is to stop using factory passwords and settings. The login and password for accessing the router's admin panel should be changed immediately after purchase.
Enable filtering by MAC addressesWhile MAC addresses can be spoofed, this creates an additional barrier to casual intruders. Create a whitelist of devices allowed to connect and deny access to all others.
- 🔒 Encryption: Use only WPA2-AES or WPA3.
- 🚫 Hiding the SSID: Hiding the network name does not provide complete protection, but it does reduce visibility for ordinary users.
- 📶 Power control: Reduce the signal strength if the router is located near a window so that the signal does not extend far beyond the apartment.
Update your router firmware regularly. Manufacturers frequently release patches to address new vulnerabilities. Outdated firmware is an open door for hackers using known exploits.
Should I hide my network name (SSID)?
Hiding your SSID isn't a reliable security method. The network still broadcasts service packets, which are easily detected by scanners. This only creates the illusion of security and can make it more difficult for your legitimate devices to connect.
Is it possible to hack Wi-Fi on iPhone without jailbreak?
No, the iOS operating system is closed source and has a strict sandbox. Without a jailbreak, it's impossible to access the Wi-Fi chip for attacks. All apps in the App Store that promise jailbreaking are fake.
What should I do if my neighbors are using my Wi-Fi?
Immediately change your password, disable WPS, and check the list of connected clients in the router's admin panel. Remove unknown devices and block them by MAC address.
Is it true that apps from the Play Market can hack Wi-Fi?
Apps from official stores are not allowed to conduct network attacks due to Google and Apple's security policies. They can only display saved passwords (if you have root access) or check the strength of your current password.
How often should I change my Wi-Fi password?
It's recommended to change your password every 3-6 months, especially if guests or IoT devices with weak security are regularly connected to the network. This minimizes the risk of a data breach.