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FZ - 125kHz RFID ​

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⛓️ External Link
https://websec.nl/

Intro ​

For more info about how 125kHz tags work check:

Actions ​

For more info about these types of tags read this intro.

Read ​

Tries to read the card info. Then it can emulate them.

⚠️

Note that some intercoms try to protect themselves from key duplication by sending a write command prior to reading. If the write succeeds, that tag is considered fake. When Flipper emulates RFID there is no way for the reader to distinguish it from the original one, so no such problems occur.

Add Manually ​

You can create fake cards in Flipper Zero indicating the data you manually and then emulate it.

IDs on cards ​

Some times, when you get a card you will find the ID (or part) of it written in the card visible.

  • EM Marin

For example in this EM-Marin card in the physical card is possible to read the last 3 of 5 bytes in clear.
The other 2 can be brute-forced if you cannot read them from the card.

  • HID

Same happens in this HID card where only 2 out of 3 bytes can be found printed in the card

Emulate/Write ​

After copying a card or entering the ID manually it's possible to emulate it with Flipper Zero or write it in a real card.

References ​

⛓️ External Link
https://websec.nl/
Learn AWS hacking from zero to hero with htARTE (HackTricks AWS Red Team Expert)!

Other ways to support HackTricks: