heikki.juva.lu

Display case for my projects and writeups. I mostly work on InfoSec, hardware hacking and electronics.


Project maintained by Zokol Hosted on GitHub Pages — Theme by mattgraham

RFID lock by OBO HANDS

Target

https://www.aliexpress.com/item/32809023198.html

Description:

Rfid Metal Access Control Keypad 
With Waterproof Cover Contactless 
Door Controller Electric Security 
Lock + 20pcs 125KHz Keychains

• Security Mode: Fail Safe
• Working Voltage: DC 12V
• Working temperature: 0~65 °C
• Storage capacity: 1000 users
• Frequency: 125KHz
• Read range: 0-15 cm
• Material: Metal

Circuit

PSU+keypad+lock circuit

System operation

  1. PSU is powered up
  2. PSU powers keypad
  3. PSU sets relays to closed-state
  4. Keypad outputs LOW-state to PULL-input if access is granted
  5. PSU sets relays to open-state for T seconds
  6. PSU sets relays to closed-state

Keypad functions

Configuration mode

  1. Set configuration pin: [0] + [new 6 digit code] + [repeat new 6 digit code] + [#]
  2. Set access mode:
    • [1] + [0]: Access requires card OR pin
    • [1] + [1]: Access requires card AND pin
    • [1] + [2]: Disable private pins
    • [1] + [3]: Enable private pins
  3. Set door open delay: [2] + [time in two digits (seconds)] + [#]
  4. Set public pin (If public pin is set to 0000 and access-mode is card OR pin, public pin is disabled): [3] + [new 4 digit code] + [#]
  5. Set tamper detection:
    • [4] + [0]: Disable tamper detection (default)
    • [4] + [1]: Enable tamper detection
  6. Enroll new card: [5] + [3 digit memory ID (001-999)], present cards to reader and finally press [#]
  7. Set door contact sensor:
    • [6] + [0]: Disable door sensor (default)
    • [6] + [1]: Enable door sensor
  8. Delete card: [7] + [3 digit memory ID (001-999)] OR [7] + present card to reader and finally press [#]
  9. Set door alarm (gives out alarm if door sensor opens without keypad granting access):
    • [8] + [0]: Disable door alarm (default)
    • [8] + [1]: Enable door alarm
  10. UNUSED

Attack vectors

Keypad

Keypad internals

PSU

Wiring harness

Door / relays / solenoids