Wi‑Fi Security Guide
Defesa Cibernética
Learn how network protocols work, their historical vulnerabilities, and how to protect your Wi‑Fi against attacks.
The Evolution of Security
WEP (1997)
The first security standard. Today it is obsolete and extremely vulnerable; its encryption has serious flaws that allow the password to be cracked in a few minutes. It should never be used.
WPA (2003)
Released as an interim fix for WEP. It introduced TKIP but still had vulnerabilities and was soon replaced.
WPA2 (2004)
The current standard in most homes. It uses strong encryption (AES). It is secure in most cases, but can be vulnerable if the chosen password is very weak and easy to guess.
WPA3 (2018)
The most modern and secure standard. It protects the network even if your password is not perfect, preventing massive offline guessing attacks.
Common Cyber Threats
Dictionary / Brute-Force Attack
Attackers capture the “handshake” (the initial communication between your phone and the router) and use powerful computers to test millions of dictionary words until they “guess” your WPA2 password.
The WPS PIN Vulnerability
Many routers have a WPS button that uses an 8-digit numeric PIN. A design flaw in this protocol allows attackers to test combinations and quickly discover the PIN, bypassing the main Wi‑Fi password.
Fake Networks (Evil Twin)
The attacker creates a fake wireless access point using exactly the same name (SSID) as your network. Your devices may connect to this fake network without realizing it, allowing data theft.
Network Defense Manual
1. Disable WPS
Open your router’s administration panel and disable the “WPS PIN” option. This is the flaw most commonly exploited by “hack” apps.
2. Create a Strong, Unique Password
Use long phrases that mix uppercase and lowercase letters, numbers, and symbols. Avoid common names and birth dates.
3. Change the Administrator Password
Most routers come with default passwords like “admin/admin”. Change this immediately to prevent visitors from reconfiguring your device.
4. Update and Use WPA3
Always keep your router’s firmware up to date. If your router and devices support it, change the security settings to WPA3.
Password Tester
Find out whether your Wi‑Fi password would withstand a brute‑force attack. (Everything is calculated locally on your device. No password is sent to the internet).
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