The question of how to crack a Wi-Fi password often arises in two completely opposite situations: when the network owner has forgotten their own login credentials or when a user wants to access someone else's access point. In today's world wireless network It has become as essential as electricity, and losing access to it can cause serious inconvenience. However, it's important to understand that any attempt to access someone else's network without the owner's permission is illegal and unethical.
From a technical perspective, the process of selecting or recovering an access key depends on the encryption type installed on the router and the physical accessibility of the device. Modern security protocols, such as WPA3, practically exclude the possibility of simple hacking, while the old standards WEP or function WPS may contain vulnerabilities. In this article, we'll take a detailed look at legal methods for restoring access to your own router, the theoretical aspects of wireless network vulnerabilities, and ways to protect your home internet from prying eyes.
If you find yourself needing to restore access, don't panic. There are several proven methods that can solve the problem without extensive knowledge of the field. cryptographyWe'll cover both software methods and physical hardware steps. Remember that the security of your personal information directly depends on the complexity of the key used and the up-to-dateness of your router's firmware.
Analysis of vulnerabilities of WEP and WPA protocols
To understand how password cracking is theoretically possible, it's important to understand the types of encryption. The oldest standard WEP (Wired Equivalent Privacy) was hacked back in the 2000s and is now considered completely insecure. The RC4 encryption algorithm it uses has static vulnerabilities that allow someone to intercept a sufficient number of data packets and recover the key in minutes, even on low-end hardware.
A more modern standard WPA/WPA2 uses the protocol TKIP or AES, which significantly complicates the task. It's no longer possible to simply intercept packets and decode them. An attacker must intercept the handshake between the legitimate client and the router and then initiate the key bruteforce process offline. This requires significant computing resources and time.
⚠️ Attention: Using traffic sniffers or attempting to hack into other people's networks without the network owner's written permission is punishable by law. All information in this article is provided for educational purposes only, intended for use in testing the security of your own networks.
Protocol WPA3, a relatively recent development, implements SAE (Simultaneous Authentication of Equals) protection, which makes it impossible to intercept a handshake for subsequent brute-force attacks. Even if an attacker intercepts the data, they won't be able to launch a brute-force attack without real-time interaction with the access point, which significantly slows down the process and makes it visible to security systems.
Recovery method via WPS (Wi-Fi Protected Setup)
One of the most common ways to crack a Wi-Fi password is to exploit a vulnerability in the technology. WPSThis feature was designed to simplify connecting devices: the user simply presses a button on the router or enters an 8-digit PIN. The problem lies in the algorithm used to verify this code.
The PIN code consists of 8 digits, but the last digit is a checksum of the first seven. Furthermore, verification occurs in two stages: first, the first 4 digits are checked, then the next 3. This reduces the number of possible combinations from 100 million to approximately 11,000. Specialized software, such as Reaver or Bully, is able to go through all the options in a few hours.
To use this method, the target router must have WPS enabled (often enabled by default on older models) and a Wi-Fi adapter that supports mode monitoring within range. The process is as follows:
- 📡 Scan the airwaves to find networks with active WPS.
- 🔓 Attempting to connect and intercepting the response from the router.
- 💻 Launching the PIN code brute-force algorithm.
- 🔑 Obtaining the main network password after successfully guessing the PIN code.
⚠️ Attention: On many modern routers (for example, Keenetic, ASUS, TP-Link (With new firmware versions), bruteforce WPS protection has been implemented. After several unsuccessful PIN attempts, the function is blocked for several hours or permanently.
If you've forgotten your network password but have physical access to the router, try finding the sticker on the bottom of the device. It often contains the factory WPS PIN, which can help you restore access without any complicated steps. However, if you've previously changed the settings, this method may not work.
Using dictionary attacks and brute force
When WPS methods are not available, the classic brute force method known as Dictionary Attack (dictionary attack) or brute-force attack. The essence of this method is that the program automatically substitutes thousands and millions of pre-prepared character combinations. The effectiveness of this method directly depends on the complexity of the password created by the user.
First, the attacker (or the network owner during recovery) creates or downloads a "dictionary"—a text file containing millions of frequently used passwords. These can include popular words, dates, names, and combinations. The program takes the hash of the intercepted handshake and compares it to the hashes of words in the dictionary.
If the password is a simple word like "password123" or "qwerty," it will be cracked in seconds. If it uses a complex character combination, brute-force attacks are used. Here, the program tries every possible combination: first one character, then two, and so on. The time required for this process can take years.
Example of a password mask
If you remember that the password started with 'Home' and ended with '2023', but forgot the middle part, you can set the mask to 'Home????2023'. The program will try all the possible combinations instead of question marks, which will take minutes instead of years.
To successfully carry out such an attack, specialized tools are required. A combination of programs is most often used. Aircrack-ng for Linux. The process requires a Wi-Fi adapter that supports monitor mode and packet injection. Without this equipment, software selection is impossible.
The speed of a brute-force attack depends on the power of the graphics card or processor. Modern graphics accelerators are capable of checking hundreds of thousands of passwords per second. However, if a password contains 12 or more characters, including numbers, uppercase and lowercase letters, and special characters, the time it takes to brute-force it can exceed the age of the universe.
Security audit software
There are a number of software packages that are marketed as password cracking tools, but are actually security audit tools. One of the most well-known is the Kali Linux — a distribution for professionals. It comes pre-installed with all the necessary utilities.
For regular users who want to check their router, there are simpler solutions. For example, programs for recovering saved passwords on the computer itself. If you've ever connected to the network from this PC, the password may have been saved in the system. Utilities like WirelessKeyView or Wifi Password Decryptor allow you to extract this data.
There are also mobile apps that claim to be able to crack passwords. Most of them are fakes or databases of publicly available passwords. While technically possible, cracking a WPA2 password from a phone is extremely difficult due to limitations of the mobile operating system and the lack of a powerful processor for computation.
☑️ Network security check
It's important to understand that no program offers a 100% guarantee of success. If the network owner used a random password generator and a long string of characters, software methods will be ineffective. In such cases, only social engineering or physical access to the device will help.
Physical access and reset of the router
The most reliable and legal way to hack a network, if you own it or have permission, is through physical contact with the equipment. If you've forgotten your Wi-Fi password but can access the router, you have two options.
The first way is to look for a sticker. On the bottom or back panel of most routers