flipperzero-firmware VS proxmark3

Man I got really excited thinking this was about the Flipper Zero device https://flipperzero.one/

We use littlefs in Flipper Zero's firmware[1] for storage in leftover flash space after the main firmware image. Flipper implements a virtual FS, where both external SD card and internal storage have own mount points. SD card is used for storing apps and user-created data, and internal littlefs contains persistent data like BLE pairing, system services configs and such.

We never had any issues with littlefs - however, it cannot be easily repartitioned when amount of available leftover space changes with firmware updates. So on installing an update, it gets fully backed up to SD card, reformatted and later restored.

1- https://github.com/flipperdevices/flipperzero-firmware/blob/...

Issue opened.

It is used in FlipperZero with FreeRTOS to handle the data structure.

I would check out the Proxmark3 Github repo [0]. They have a cheatsheet [1] with the basics on how to get started. I also did a talk about RFID security last year about the basics [2]

To get started, the basics are: low freq (LF) is usually around 125khz and is rarely encrypted (HID Prox is the most common in the US). The data is often encoded in Wiegand format for access control systems (something to keep in mind when reading the raw data).

High freq (HF) (aka NFC) is ~13Mhz and is readable by most Android phones with NFC. Not all tag data can be read however. HF cards support a lot of different options including data storage (normally in a block layout with permissions to read and write depending on keys) and encryption (iCLASS and SEOS being the HID offerings and very common). Some can be cloned (like hotel cards) while others (like SEOS) require a downgrade attack to work correctly (SEOS -> normal SEOS reader -> Weigand data -> older style card like HID Prox).

[0] https://github.com/RfidResearchGroup/proxmark3

[1] https://github.com/RfidResearchGroup/proxmark3/blob/master/d...

[2] https://www.youtube.com/watch?v=zKOAywZqisc

🔗 https://github.com/RfidResearchGroup/proxmark3/releases/tag/v4.17140

After pulling and compiling a newer proxmark3 generic firmware from the RfidResearchGroup repo I got farther but now have a new message I've not found much about with static nonces. https://github.com/RfidResearchGroup/proxmark3/

you could use linux (ubuntu) https://github.com/RfidResearchGroup/proxmark3/blob/master/doc/md/Installation_Instructions/Linux-Installation-Instructions.md

You will have to do the leg word, but this is a starting point: https://github.com/RfidResearchGroup/proxmark3/blob/master/client/luascripts/hf_mf_sim_hid.lua

Grab yourself a Proxmark3, read the instructions here, and you can extract your iClass elite key in a few seconds. You can pick up a PM3 easy for a few bucks.

I cloned whatever the latest commit was at https://github.com/RfidResearchGroup/proxmark3, which is what the guide on dangerous things suggests (where I bought my PM).