Modern wireless networks require constant monitoring and vulnerability testing, and one of the key steps in such testing is handshake capture. Handshake Wi-Fi Handshake is an authentication process during which the client device and access point exchange encrypted packets to confirm a password. Understanding how to obtain a handshake on Windows 10 is essential for system administrators and cybersecurity professionals to assess the encryption strength of corporate and home networks.
Many users mistakenly believe that intercepting a four-way handshake requires sophisticated hardware or operating systems like Kali Linux, but modern tools make it possible to accomplish this task on a standard Windows 10 system. WPA2-PSK and a newer standard WPA3 While different security algorithms are used, the principle of intercepting initial packets remains similar. In this article, we'll cover the software, hardware requirements, and step-by-step instructions for successful data capture.
It is important to note that any actions to intercept traffic should be carried out exclusively as part of testing one's own networks or with the written permission of the infrastructure owner. Capturing a handshake without authorization is a violation of data protection laws in many jurisdictions. The following instructions are strictly educational in nature and are aimed at improving your knowledge of network security.
Theoretical foundations of the authentication process
Before we get to the practical part, it's important to understand what exactly happens when a device connects to a router. This process is known as 4-way handshake, is launched every time a device attempts to connect to a password-protected access point. At this point, four special frames are exchanged containing password hashes, but not the cleartext password itself.
The purpose of this exchange is to confirm that both parties know the shared secret (password) without transmitting it over the air. If an attacker or security auditor intercepts these packets, they can attempt to guess the password offline using brute-force methods or dictionary searches. PMKID And PTK — these are terms that are often encountered in traffic analysis, denoting keys generated during the handshake process.
The difficulty of getting a handshake on Windows 10 has historically been rooted in wireless adapter drivers. Most standard cards don't support monitor mode, which is necessary for listening to the entire airwaves, not just packets addressed to a specific device. However, the advent of specialized drivers and utilities has made it possible to overcome these limitations.
⚠️ Note: Standard Windows drivers block monitoring mode by default. For successful interception, you will need an adapter with a chipset that supports injection and monitor mode, and the appropriate software driver installed.
Understanding packet structure helps you configure sniffer filters correctly. You don't need to capture all user traffic; it's enough to catch the moment of reconnection or use the deauthentication method (if permitted by the testing policy) to initiate a re-handshake.
Necessary equipment and software
To implement this task on a Windows 10 operating system, you'll need a specific set of tools. Unlike Linux, where wireless support is built into the kernel, Windows requires third-party drivers. The most popular and proven solution is the AirCrack-ng for Windows, which is ported to work in this environment.
A critical component is the network adapter. Built-in Wi-Fi modules in laptops rarely provide the necessary functionality. You'll need an external chip-based USB adapter. Atheros AR9271, Ralink RT3070 or Realtek RTL8812AUThese chipsets work reliably with drivers that allow the card to be put into monitoring mode.
The list of required software includes:
- 📡 AirCrack-ng suite — a basic set of utilities for auditing wireless networks, including aireplay-ng and airodump-ng.
- 🖥️ Npcap — a WinPcap-compatible packet capture driver, required for sniffers to work in Windows 10.
- 📝 Wireshark — a powerful traffic analyzer that may be needed for manual inspection of captured files.
- 🔧 Netsh — a built-in Windows utility that can be used to manage interfaces in some cases.
Npcap must be installed with raw socket support and WinPcap API compatibility enabled. Without this step, AirCrack-ng programs will not be able to access the network interface at a low level. After installing all components, it is recommended to reboot the system to ensure proper driver initialization.
⚠️ Note: Program interfaces and command parameters may vary depending on the AirCrack-ng version. Always consult the developer's official documentation, as updates may introduce syntax changes.
Setting the network adapter to monitor mode
The most difficult step for beginners is switching the network card to a mode that allows it to see the entire airwaves. In Windows 10, this is done not through the standard adapter properties window, but through the command prompt with administrator rights or specialized utilities. First, you need to know the exact name of your wireless interface.
Open a command prompt and enter the command to list your interfaces. In the AirCrack-ng list, your adapter may appear under a different name than the one you see in Device Manager. Typically, it's something like wlan0 or wifi0Make sure that the adapter driver supports monitoring mode, otherwise further steps are pointless.
To enable monitoring mode, use the command airmon-ng start [interface_name]If the process is successful, the system will create a virtual interface, often with a suffix mon (For example, wlan0mon). We'll be working with this new interface from now on. If an error occurs, try disabling processes that might be interfering with the map using the command airmon-ng check kill.
There is an alternative method through the utility netsh, but it's less reliable for security auditing purposes. AirCrack-ng commands provide deeper control over signal reception parameters. Make sure you're running as an administrator, otherwise access to the hardware will be blocked by the Windows security system.
⚠️ Note: When you enable monitoring mode, your current Wi-Fi connection will be disconnected. The adapter will stop acting as a client and become a passive listener.
Checking the interface status is a mandatory step before starting a scan. Make sure the mode indicator is green in the program interface or the corresponding flag is displayed in the console. This ensures you see not only your own traffic but also service packets from neighboring networks.
Analysis of the surrounding space and target selection
After successfully configuring the interface, you need to scan the airwaves to detect available networks. Launching the scanner will list all access points within range, their channels, signal strengths, and encryption types. The command airodump-ng [monitoring_interface_name] displays the table in real time.
In the table, you'll see columns with BSSID (the router's MAC address), PWR (signal strength), Beacons (number of beacons), #Data (number of data packets), and ESSID (network name). For successful handshake capture, it's best to choose networks with a strong signal (a PWR value closer to 0 or -10, while values like -90 indicate a very weak signal). The parameter ENC, which should indicate WPA2 or WPA.
Pay attention to the column #DataIf the data packet counter is increasing, there are active users on the network, increasing the chances of quickly securing a handshake. If the network is empty, you'll have to wait for a new client to connect or use active deauthentication methods (for testbeds only!).
To filter the output and write data only to a specific network, use the keys --bssid And --channelThis will reduce the processor load and allow the file to be saved in a more compact format. Example command: airodump-ng --bssid AA:BB:CC:DD:EE:FF --channel 6 -w capture wlan0mon.
The process of intercepting and storing packets
Once the scan is started and filtered by the target BSSID, the program begins recording all packets transmitted on the selected channel to a file. The file is typically saved in the following format: .cap or .pcapAt the top of the screen, you'll see a handshake counter. As long as it shows zero, the process is not complete.
There are two main scenarios for obtaining a handshake. The first is passive: you simply wait for one of the users to connect to the network voluntarily. This can take anywhere from a few seconds to several hours. The second is active: you use the deauthentication function to forcibly disconnect the client, forcing them to automatically reconnect.
For the active method (only on your own networks!) the command is used aireplay-ng --deauth 10 -a [router_BSSID] -c [client_MAC] wlan0monThe number 10 represents the number of connection break frames sent. As soon as the client attempts to reconnect, the airodump-ng console utility will display the following message in the upper right corner: WPA handshake: AA:BB:CC:DD:EE:FF.
After the handshake message appears, you can stop the scanning process by pressing the key Ctrl+C. File with extension .capThe file created during the process now contains the necessary data. You can check for the handshake in the file immediately by running the command aircrack-ng -w wordlist.txt capture-01.capIf the program displays "KEY NOT FOUND," this doesn't mean there's no handshake. It means the dictionary doesn't contain the correct password, but the handshake itself is confirmed.
☑️ Checking the success of the capture
Comparison of methods and troubleshooting
Wireless networking in Windows 10 can be plagued by a number of specific issues, from driver issues to interference. Below is a table to help diagnose the most common problems you might encounter when trying to establish a handshake.
| Problem | Possible cause | Solution |
|---|---|---|
| The adapter does not see the network | Invalid channel or mode | Make sure the scanning channel matches the router channel. |
| "Interface busy" error | Driver conflict | Disable built-in Wi-Fi or close other access programs |
| Handshake isn't catching | Weak signal or WPA3 | Move closer to the router or use SAE for WPA3 |
| Airmon-ng won't start | No admin rights | Run the console as administrator |
It is worth noting the difference between capturing on WPA2 and WPA3. Protocol WPA3 uses the SAE (Simultaneous Authentication of Equals) mechanism, which makes classic handshake attacks significantly more difficult, if not impossible, using traditional methods. In such cases, the standard 4-way handshake may not be visible in its usual form, requiring more advanced analysis tools.
If you're using a virtual machine (VMware, VirtualBox) on Windows 10, make sure the USB adapter is forwarded to the guest OS and not left on the host. Users often forget to switch the device in the virtualization menu, and the program only sees the built-in adapter, which doesn't support monitoring.
⚠️ Warning: Some antivirus programs and Windows firewalls may block AirCrack-ng, treating it as malware. It is recommended to add the utility folder to the exclusion list during testing.
The USB port's power supply stability also plays a role. If the adapter is powerful, it may not be able to draw enough current from a single port. Use a USB hub with external power to avoid sudden card shutdowns during critical packet capture moments.
What to do if the handshake is damaged?
Sometimes a file contains a handshake, but it's marked as corrupted. Try using the hcxpcapngtool utility to convert and clean the file, or run aircrack-ng with the --keep-pts flag to try using the existing data.
Frequently Asked Questions (FAQ)
Is it possible to get a Wi-Fi handshake without breaking the client connection?
Yes, this is possible using the passive method. You need to initiate a scan and wait until an authorized user connects to the network or the device automatically reconnects. This takes longer, but is a completely silent method.
How long should a password be to make it impossible to guess from a handshake?
Password length is less important than its entropy (randomness). A password of 12 random characters, including numbers, letters, and special characters, is considered cryptographically secure against dictionary attacks. Simple words, even long ones, can be guessed fairly quickly.
Does this method work on Windows 11?
Yes, the AirCrack-ng drivers and utilities operate the same on both Windows 10 and Windows 11. However, Windows 11 may have stricter driver signature requirements, so you may need to temporarily disable driver signature verification to install modified Wi-Fi adapter drivers.
Why do you need a handshake if the password is already unknown?
Handshake contains a hashed version of the password. Having obtained this data, a security researcher can take the file with them and attempt to brute-force the password offline on powerful equipment, away from the network and without generating unnecessary traffic.