PicoPass¶

Description¶

Picopass¶

This application allows you to read, write, save, and emulate legacy HID iClass cards and fobs (based on the picopass chipset). Also supports saving the credential to the Flipper Zero LFRFID data format, changing the keys on the card, performing dictionary attack, and performing the 'online' part of the loclass attack.

Loclass¶

The loclass attack emulates specific CSN and collects responses from the reader which can be used to calculate the elite or (some) custom key configured for that reader. This key is then used to read data on the cards used with that reader.

Online part¶

1. Run loclass from the picopass main menu
2. Present the flipper to the reader. Holding flipper directly to reader may not work, vary distance by a few inches.
3. Collect responses until the progress bar is full.

NOTE: If the screen says “Got std key” AND stays on 0/18, then loclass isn't needed.

Offline part¶

1. Download the loclass log (sdcard/apps_data/picopass/.loclass.log) from your Flipper Zero.
2. Use loclass.ericbetts.dev or a tool of your choice to calculate the key
3. Copy the key to iclass_elite_dict_user.txt and place in sdcard/apps_data/picopass/assets/
4. Run Elite Dict. Attack from the picopass main menu
5. Present card to the back of the Flipper Zero.

Failure¶

There are some situations when the offline loclass may not find a key, such as: * non-iClass picopass (Circuit Laundry, etc) * iClass SE * Readers configured with Standard-2 keyset * Custom keyed readers using Standard KDF * Custom keyed readers using SE KDF

NR-MAC read¶

Due to the nature of how secure picopass works, it is possible to emulate some public fields from a card and capture the reader's response, which can be used to authenticate. Two of the pieces involved in this are the NR and MAC.

These instructions are intended to be performed all at the same time. If you use the card with the reader between Card Part 1 and Card Part 2, then Card Part 2 will fail.

Card Part 1¶

1. Place card against Flipper Zero
2. Run Read from the picopass main menu
3. Get a "Read Failed" message
4. Select the "Menu" option
5. Select "Save Partial"
6. Name file something you'll remember

Reader Part¶

1. Select Saved from the picopass main menu
2. Select the file name you saved in last step of Card Part 1
3. Select Emulate
4. Expose Flipper Zero to reader (It may work better a few inches from the reader, as opposed to physically touching)
5. Flipper will buzz and screen will say "NR-MAC Saved!"

Card Part 2¶

1. Place card against Flipper Zero
2. Run Read from the picopass main menu
3. Card will authenticate and read

Changelog¶

1.13¶

• Rework loclass writer with datetime lib

1.12¶

• Add support for non-secure Picopass
• Change Read to use all dictionaries
• Improve saving of cards authenticated with NR-MAC

1.11¶

• Update working with keys with new API
• Display more tag information
• Add additional keys to elite dict
• Correct config card detection so it doesn't happen for SE cards (read using nr-mac partial read)
• Have back button go to start menu instead of read retry

1.10¶

• Fix missing folder in readme
• Allow partial save for any read failure

1.9¶

• Fix bug (#77) with loclass
• Better loclass notes
• Read card using nr-mac
• Save as Seader format

1.8¶

• Minimal changes for recent API updates

1.7¶

• Rework application with new NFC API

1.6¶

• Faster loclass response collection
• Save as LF for all bit lengths
• Removes unvalidated H10301 parsing

1.5¶

• New random filename API

1.4¶

• Optimize crypto speed to fix compatibliity with Signo and OmniKey readers

1.3¶

• Show standard key instead of hex bytes when detected

1.2¶

• Sentinel bit remove

1.1¶

• Key dicts moved to app assets

1.0¶

• Initial release