ShmooCon 2022: RFID Key Cloning for Angry Bikers

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My building requires an RFID key in order to access the garage. But I ride. Fishing out the only copy of my key, with gloved hands, on a vehicle that requires both hands to operate? Not so simple. We all know that it’s easy to duplicate these things, but actually doing it? The devil is in the details, and those details are strewn across the internet in blog posts, readme files, and members-only forums. Where do you start? * So, how does RFID work, anyway? * What’s the frequency? (Spoiler: Kenneth does not know.) * What’s a chipset and which am I using? * How far can ten bucks on ebay get me? * How far can a couple hundred get me? * And to solve my problem, what clever form factors are available to get around the gloved motorcycle situation? (No, I did not inject a chip in myself.) If you’ve ever boasted, “those things are so insecure,” but want to be able to back it up, ten minutes is all you need, to get the basics.

Technology

An Introduction to RFID Cloning
( for angry bikers )
Gabe Schuyler
@gabe_sky
ShmooCon 2022

The motivation
• Garage gate w/ RFID
• Gloves
• Two-handed vehicle
• "It's so easy ..."
Gabe Schuyler @gabe_sky
ShmooCon 2022

Passive RFID
• A flashlight and a mirror
• Flashlight: send binary in flashes
• Mirror: reflect binary response
Gabe Schuyler @gabe_sky
ShmooCon 2022

Frequencies & Chips
• 125 kHz (low frequency)
• HID ProxCard
• EM41xx
• T55xx chips
• 13.56 MHz (high frequency)
• HID iClass
• MIFARE Classic
Gabe Schuyler @gabe_sky
ShmooCon 2022

Ten bucks on eBay
• Cheap
• Works
• Quirky
• Get rewritable tags!
Gabe Schuyler @gabe_sky
ShmooCon 2022

A few bucks more
• Proxmark 3
• Does it all
• Open source
Gabe Schuyler @gabe_sky
ShmooCon 2022

Read
• Facility code
• Card number
Gabe Schuyler @gabe_sky
ShmooCon 2022

Write
• T55xx
Gabe Schuyler @gabe_sky
ShmooCon 2022

Form factors
• Fobs
• Cards
• Keys
• Injectable
• and Rings!
Gabe Schuyler @gabe_sky
ShmooCon 2022

"Open!"
Gabe Schuyler @gabe_sky
ShmooCon 2022

Go experiment!
Gabe Schuyler
@gabe_sky
ShmooCon 2022

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ShmooCon 2022: RFID Key Cloning for Angry Bikers

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