What Is Wi-Fi Security?

Wi-Fi security ensures that only trusted users can connect to a wireless network. Through a series of security protocols and encryption tools, it helps protect your devices and data from bad actors trying to infiltrate, intercept, or otherwise damage a Wi-Fi network. 

Stanislav Krajcir

23.09.2024

6 min read

Why is Wi-Fi Security Important?

Wi-Fi networks, whether in your home, office, or local coffee shop, transmit a wealth of sensitive information. They act as the middle-man between your mobile device or laptop and the internet, and communicate your data through the airwaves with no physical barrier to protect it. 

This means that, to be secure, Wi-Fi networks must use a variety of protocols and encryption standards to protect users’ privacy and data. 

Otherwise, bad actors can intercept the network traffic and exploit the data in transit. 

Understanding Wi-Fi Security in 4 Steps

To understand how Wi-Fi security works, we’ll break down the key components involved in establishing a secure Internet connection.

1. Handshake. Once your device connects to a wireless access point, such as a Wi-Fi router, both sides agree on key security protocols (see below) to make sure your Wi-Fi connection is secure. 
2. Access control. This ensures only authorized users can gain entry to a Wi-Fi network by verifying their identity, device type, location, and more. This is based on an allowlist of users and endpoints, and helps prevent threat actors from attacking the network. Bear in mind that not all Wi-Fi networks employ access control, especially open, public networks. 
3. Encryption. Wi-Fi networks use encryption keys to scramble the data transmitted between your device and the internet, preventing it from being intercepted. Only devices with the correct key can decrypt the data. Again, not all Wi-Fi networks do this. 
4. Authentication. This ensures that the encryption process has actually worked. Before communication starts, the device and access point agree on a secret key and algorithm. A Message Integrity Code (MIC) or Message Authentication Code (MAC) is then generated using the key and added to the message before encryption. The receiver decrypts the message and compares the received MAC with one it generates using the same key. If they match, the data is verified as authentic. 

Types of Authentication

Here are the three most common types of Wi-Fi authentication.

• Open Authentication. Doesn’t require a password or credentials, allowing anyone to connect freely. Often used in public Wi-Fi networks, it offers little to no security for users.
• Personal Authentication. Designed for home or small business networks. It requires a shared password for access, offering better security than open networks. However, all users share the same key, making it less secure than enterprise authentication.
• Enterprise Authentication. This mode is typically used by organizations and offers the highest level of security. It requires each user to authenticate individually, ensuring stronger access control.

Key Wi-Fi Security Protocols

The following Wi-Fi security protocols, introduced by the Wireless Alliance, are designed to protect wireless networks to some level, with WEP being the weakest and WPA3 the strongest:

• Wired Equivalent Privacy (WEP). Introduced in 1997, WEP is now considered outdated and shouldn’t be used to secure networks.
• Wi-Fi Protected Access (WPA). A step up from WEP, WPA provides better encryption but is still susceptible to certain attacks. 
• WPA2. The most widely used protocol today. It offers better security (with 128-bit encryption) to WPA.
• WPA3. This is the newest and most secure Wi-Fi security protocol (with 192-bit encryption), offering versions for home, corporate, and open networks. Ideally, it should be used to secure all new networks. 

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Common Wi-Fi Security Risks

Let’s explore the most common Wi-Fi security risks in both public, home, and corporate networks. 

Public Wi-Fi Networks

Here are the most common security risks of public Wi-Fi networks:

• Man-in-the-Middle (MiTM) Attack. Attackers intercept the data transmitted between your device and the Wi-Fi network, often by creating Evil Twins—malicious networks and hotspots designed to trick users into connecting. 
• DNS Spoofing. Attackers manipulate the Domain Name System (DNS) settings on public Wi-Fi networks and redirect users to malicious websites. 
• Phishing. Similar to a MiTM attack, threat actors create fake login pages on public Wi-Fi networks to trick users into revealing personal information.
• Packet Sniffing. If your network uses weak encryption (like WEP), attackers can use packet sniffing tools to analyze the traffic and capture sensitive data.

Home Wi-Fi Networks

Here are the most common security risks of home Wi-Fi networks:

• Weak Passwords. Using default or weak passwords makes it easy for attackers to gain access to your network and devices.
• Rogue Access Points. Unauthorized devices—installed without permission from an admin—can be used to exploit the network.
• Unsecured Devices. Internet of Things (IoT) devices are often overlooked as vulnerabilities. However, devices like smart speakers and cameras may have security holes that attackers can use to gain access to your home network.
• Unsecured Networks. If your Wi-Fi network is not secured with a password and/or strong encryption standards, it could be susceptible to any of the attacks listed in this section.

Corporate Wi-Fi Networks

Here are the most common security risks of corporate Wi-Fi networks:

• Brute Force Attacks. Attackers can use brute force methods (such as password spraying and credential stuffing) to try multiple corporate Wi-Fi passwords until they find the right one. 
• Denial of Service (DoS) or Distributed Denial of Service (DDoS) Attacks. Attackers flood the Wi-Fi network with traffic to disrupt operations.
• MAC Address Spoofing. An attacker spoofs the MAC address of an authorized device to gain access to a network. 
• Insider Threats. Employees or contractors with authorized access to the Wi-Fi network can sabotage it from within.

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15 Best Practices for Wireless Security

Here are the wireless security best practices for each network type.

Public Wi-Fi Networks

Lacking strong authentication and encryption standards, public Wi-Fi is often insecure. To improve your security posture while connecting on the go:

• Avoid using public Wi-Fi for sensitive tasks. 
• Use a virtual private network (VPN) to encrypt your data. 
• Avoid websites that aren’t protected by HTTPS (indicated by a padlock symbol in your browser).
• Always connect to networks that use WPA2 or WPA3 security protocols.
• Watch out for suspicious prompts or behaviors when browsing the web.

Home Wi-Fi Networks

Though your home Wi-Fi network has fewer users than a public one, it can still be a target for attackers. To keep them at bay:

• Change your default SSID and use personalized credentials to lower the risk of brute force attacks.
• Enable your router’s firewall to add an extra layer of security.
• Create complex passwords and update them regularly.
• Update your firmware regularly too. 

Corporate Wi-Fi Networks

Stricter security measures are needed for corporate networks due to the sensitive nature of business data:

• Use Public Key Infrastructure (PKI) services to restrict network access to authorized users (with the right certificates) only.
• Segment users on your network (such as employees and third parties) to reduce your attack surface. 
• Filter MAC addresses to make sure only trusted devices can connect to your network.
• Turn off remote admin access to your Wi-Fi router.
• Regularly update network hardware and software. 
• Implement security software designed for corporate Wi-Fi security. 

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