Car Relay Attack System: Full Guide

What is a Relay Attack Device?

A relay attack device is a two-part equipment that relays the signal between a vehicle remote and the car. This equipment uses two devices working simultaneously to relay signals over long distances.

Relay attack systems are typically utilized by automotive professionals to evaluate security flaws in keyless entry systems.

How Does a Relay Equipment Work?

The relay attack operates using two separate units that coordinate:

  1. Primary unit is placed near the remote key (at home)
  2. Unit 2 is placed near the automobile
  3. Primary unit receives the communication from the car key
  4. The data is relayed to Unit 2 via data transmission
  5. Second device broadcasts the transmission to the car
  6. The car assumes the key fob is in proximity and grants access

Components of a Relay Attack System

TX Unit

The transmitter is the initial device that detects the signal from the car remote.

Sending unit capabilities:

  • High sensitivity for low power
  • LF receiving
  • Portable form
  • Internal sensor
  • Rechargeable

RX Unit

The RX unit is the companion device that broadcasts the forwarded transmission to the automobile.

Receiver features:

  • Power enhancement
  • Radio frequency transmission
  • Adjustable power
  • Long distance
  • Visual feedback

Types of Relay Attack Devices

Basic Relay Attack Device

A basic relay attack device offers basic relay capabilities.

Features of standard devices:

  • Basic dual device
  • Limited range ( 50-100 meters)
  • Manual operation
  • Standard protocol
  • Compact build
  • Budget-friendly investment

Professional Relay System

An advanced relay attack device offers professional functions.

Advanced features:

  • Extended range ( 300-1000 feet)
  • Wide frequency range
  • Hands-free operation
  • Protected transmission
  • Real-time monitoring
  • Quick transmission (instant forwarding)
  • Wireless setup
  • Event recording

Use Cases

Security Research

Relay systems are important devices for penetration testers who evaluate smart key weaknesses.

Industry uses:

  • Smart key evaluation
  • Vulnerability identification
  • Security validation
  • Automotive security audits
  • Security incidents

R & D

Car manufacturers and security firms utilize attack devices to develop improved protection against relay attacks.

Technical Specifications of Relay Attack Devices

Communication Range

Advanced attack equipment offer multiple ranges:

  • Standard distance: 50-100 meters
  • Professional range: 100-200 meters
  • Industrial range: maximum coverage

Delay

Signal delay is essential for successful signal forwarding:

  • Low latency: minimal delay
  • Standard latency: 10-50ms
  • High latency: > 50ms

Frequency Support

Relay systems handle various frequencies:

  • 125 kHz: Key fob transmission
  • 315 MHz: North American standard
  • 433 MHz: RF
  • 868-915 MHz: Advanced keys

Energy Consumption

Attack devices typically use:

  • Battery type: Built-in battery
  • Runtime: 4-12 hours relay mode
  • Recharge duration: quick charge
  • Standby time: extended standby

Buying Guide: How to Choose a Relay Attack Device

Key Considerations

Before you invest in attack equipment, evaluate these elements:

  1. Purpose: Professional testing
  2. Range requirements: How far the components will be separated
  3. Band support: Target automobiles you need to assess
  4. Latency requirements: Timing for forwarding
  5. Budget: Available funds
  6. Authorized use: Check legal status

Price Range for Relay Systems

The price of relay attack devices differs significantly:

  • Entry-level devices: $ 300-$ 600
  • Standard systems: $ 500-$ 1500
  • Professional equipment: $ 2000-$ 4000
  • Industrial grade: premium investment

Where to Buy Relay Attack Device

Legitimate Sellers

When you buy a relay attack device, select only legitimate sources:

  • Professional tool vendors
  • Certified dealers
  • Factory sales
  • Trade channels
  • Academic vendors

Online Purchase of Attack Equipment

Automotive experts often opt to order equipment via web.

Advantages of e-commerce:

  • Large variety
  • Product information
  • Cost analysis
  • Professional reviews
  • Secure payment
  • Discreet shipping
  • Expert assistance

Legal Status

Legal Applications

Relay systems are permitted for specific uses:

  • Authorized testing
  • Automotive manufacturer testing
  • Security consultant work
  • Legal proceedings
  • Research institutions
  • Military research

Important Notice

CRITICAL REMINDER: Attack equipment are sophisticated equipment that must be used legally. Unauthorized use can result in severe penalties. Only use for legal applications with proper authorization.

Setup and Deployment

Initial Setup

Setting up your relay attack device:

  1. Power up all devices
  2. Connect the two devices
  3. Configure frequency parameters
  4. Verify connection between devices
  5. Position transmitter near remote
  6. Place second device near vehicle

Expert Techniques

For optimal results with your relay system:

  • Eliminate obstacles between units
  • Confirm direct communication
  • Check signal strength consistently
  • Position strategically for best reception
  • Document all testing
  • Keep authorized use

Testing Methodology

Security Assessment

When using attack equipment for research:

  1. Secure written consent
  2. Document the configuration
  3. Place units per protocol
  4. Perform the relay attack
  5. Capture results
  6. Analyze performance
  7. Document conclusions

Maintenance of Relay System

Regular Maintenance

To maintain optimal performance of your relay system:

  • Keep equipment dust-free
  • Upgrade firmware when provided
  • Verify connection routinely
  • Verify receiver status
  • Recharge units regularly
  • House in suitable environment
  • Safeguard from water and environmental stress

Problem Solving

Common Problems

Should your attack equipment has issues:

  1. Connection failure: Reconnect the two units
  2. Weak signal: Eliminate separation between units
  3. High latency: Check environmental conditions
  4. Inconsistent operation: Refresh firmware
  5. Short runtime: Upgrade power source
  6. Unsuccessful relay: Check target compatibility

Alternatives

Technology Differences

Understanding the distinctions between relay attack devices and other technologies:

  • Relay system: Dual device that bridges transmissions in real-time
  • Signal amplifier: Single unit that amplifies transmissions
  • Interceptor: Records and saves transmissions for replay

Strengths of Attack Equipment

Attack equipment provide unique advantages:

  • Long distance capability
  • Instant forwarding
  • Supports encrypted signals
  • Direct relay needed
  • Better effectiveness against modern systems

Security Implications

Protecting Against Relay Attacks

For automobile owners concerned about safety:

  • Use Signal blocking bags for remotes
  • Turn on power-saving on smart keys
  • Install mechanical security
  • Keep in safe environments
  • Enable extra protection
  • Disable keyless entry when at home
  • Monitor industry news

OEM Protections

Current automobiles are using different defenses against relay attacks:

  • Movement detection in remotes
  • Distance measurement checking
  • Ultra-wideband technology
  • Signal strength analysis
  • Layered security steps

Technology Evolution

The advancement of attack equipment promises:

  • AI-powered timing adjustment
  • Extended coverage
  • Protected transmission between relay units
  • Compact design of equipment
  • Extended distance (extreme range)
  • Instant relay (submillisecond)
  • Cross-platform operation
  • Remote configuration

Conclusion: Should You Buy a Relay Attack Device?

Purchase relay system if you are a professional in:

  • Car safety assessment
  • Penetration testing
  • Law enforcement
  • Educational study
  • Manufacturer testing
  • Defense industry

The equipment investment matches the capabilities and reliability. Advanced devices with extended range command higher prices but provide superior results.

Understand that if you invest in attack technology, legal compliance is absolutely essential. These are advanced tools designed for security professionals only.

The relay system stands as one of the most powerful systems for assessing keyless entry vulnerabilities. Employed ethically by qualified professionals, these tools improve vehicle protection by identifying weaknesses that manufacturers can then address.

Exclusively buy from authorized vendors and ensure you have official approval before deploying relay attack devices in any research situation.