Welcome to CyberCode Academy — your audio classroom for Programming and Cybersecurity. 🎧 Each course is divided into a series of short, focused episodes that take you from beginner to advanced level — one lesson at a time. From Python and web development to ethical hacking and digital defense, our content transforms complex concepts into simple, engaging audio learning. Study anywhere, anytime — and level up your skills with CyberCode Academy. 🚀 Learn. Code. Secure.
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Welcome to CyberCode Academy — your audio classroom for Programming and Cybersecurity. 🎧 Each course is divided into a series of short, focused episodes that take you from beginner to advanced level — one lesson at a time. From Python and web development to ethical hacking and digital defense, our content transforms complex concepts into simple, engaging audio learning. Study anywhere, anytime — and level up your skills with CyberCode Academy. 🚀 Learn. Code. Secure.
Course 14 - Wi-Fi Pentesting | Episode 5: WEP Cracking: Packet Injection and Replay Attacks (ARP, Chopchop, Fragmentation, and SKA)
CyberCode Academy
11 minutes
3 weeks ago
Course 14 - Wi-Fi Pentesting | Episode 5: WEP Cracking: Packet Injection and Replay Attacks (ARP, Chopchop, Fragmentation, and SKA)
In this lesson, you’ll learn about:
Why WEP cracking depends on Initialization Vectors (IVs)
How packet injection accelerates WEP cracking
The most reliable WEP injection technique (ARP Replay)
Alternative injection methods for idle networks
The conceptual difference between Chopchop and Fragmentation attacks
Why Shared Key Authentication (SKA) changes the attack strategy
How attackers adapt when fake authentication is blocked
Forcing IV Generation on WEP Networks Cracking WEP depends on collecting a large number of Initialization Vectors (IVs). On busy networks, IVs are generated naturally through traffic. However, on idle networks, attackers must force the access point to generate new packets, which in turn generates new IVs. This episode explains three primary packet injection methods, followed by a special technique for Shared Key Authentication (SKA) networks. 1. ARP Request Replay Attack (Most Reliable Method) This is considered the most effective and dependable method for accelerating IV collection. Conceptual Overview
The attacker monitors the network.
A special ARP request packet is captured.
This ARP packet is:
Replayed repeatedly back into the network.
Each replay forces the access point to:
Respond with a new encrypted packet
Generate a new IV
This results in:
A rapid increase in the IV count
Enough data to crack:
64-bit WEP keys
128-bit WEP keys
Key Requirement
The attacker must first associate with the target network
Without association:
The access point will ignore injected packets
2. Chopchop Attack (For Low-Traffic Networks) This method is useful when:
The network has no connected clients
There is very little traffic
No ARP packets are naturally available
How the Chopchop Attack Works (Conceptually)
A single encrypted packet is captured.
The attacker attempts to:
Recover part of the keystream
Even a partial keystream (around 80–90%) can be sufficient.
Using this partial keystream:
A new forged ARP packet is created.
This forged packet is then:
Injected into the network
Forces the access point to generate new encrypted packets
Rapidly increases the IV count
This method:
Does not rely on existing ARP traffic
Works even when the network is almost completely idle
3. Fragmentation Attack This attack is similar in concept to Chopchop, but with an important difference. Key Characteristics
Instead of recovering a partial keystream:
The attacker recovers the entire 1,500-byte PRGA
Once the full PRGA is obtained:
A forged packet is created
The packet is injected into the network
IV generation increases rapidly
Comparison with Chopchop
Requires:
Better signal quality
Being physically closer to the access point
Advantages:
Much faster than Chopchop
More reliable once PRGA is fully obtained
4. Cracking WEP Networks Using Shared Key Authentication (SKA) Most WEP networks use:
Open Authentication
However, some rare networks use:
Shared Key Authentication...
CyberCode Academy
Welcome to CyberCode Academy — your audio classroom for Programming and Cybersecurity. 🎧 Each course is divided into a series of short, focused episodes that take you from beginner to advanced level — one lesson at a time. From Python and web development to ethical hacking and digital defense, our content transforms complex concepts into simple, engaging audio learning. Study anywhere, anytime — and level up your skills with CyberCode Academy. 🚀 Learn. Code. Secure.
