Knox-Key
Knox-Key is an open source STM32 PCB design by Kingdragoncat: a 2-layer, 31.2 × 17.1 mm board with 29 components (17 distinct parts). It is built around the ATECC608B-MAHDA-S, MCP1700T-3302E/TT, USBLC6-2SC6, STM32L433CBTX.
Knox Key is a high-performance, open-source hardware authenticator designed for secure digital identity and cryptographic operations. Built with a focus on a "zero-trust" hardware architecture, it combines low-power processing with a dedicated secure element in a slim, USB-C form factor.
This is a custom USB-C FIDO2 security key. The repository contains the KiCad 9 hardware files (schematics, PCB layout, fab outputs) and the authenticator firmware.
The hardware pairs an STM32L433 microcontroller with an ATECC608B secure element. The project started out as an STM32F072 design (originally named "kryptonite") but was later reworked to use the L433.
Built around
Parts list
29 components, 17 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATECC608B-MAHDA-S ATECC608B-MAHDA Microchip Tech | DFN-8-1EP_3x2mm_P0.5mm_EP1.3x1.5mm | U2 |
| 1 | MCP1700T-3302E/TT MCP1700x-330xxTT Microchip Tech | SOT-23 | U3 |
| 1 | USBLC6-2SC6 STMicroelectronics | SOT-23-6 | U4 |
| 1 | STM32L433CBTX STM32L433CBTx | LQFP-48_7x7mm_P0.5mm | U6 |
| 1 | TAXM8M4RLBDDT2T 8MHz Yajingxin | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | CONN_01X05 Conn_01x05 | PinHeader_1x05_P2.54mm_Vertical | J3 |
| 1 | TYPE-C-31-G-01 USB_C_Plug_USB2.0 Korean Hroparts Elec | TYPE-C-31-G-01 | P1 |
| 1 | TS-1187A-B-A-B SW_Push XKB Connection | SW_Push_1P1T_XKB_TS-1187A | SW1 |
| 1 | ASMB-MTB1-0A3A2 | LED_Avago_PLCC4_3.2x2.8mm_CW | D1 |
| 3 | C0603X5R106M160NT 10u SANYEAR | C_0603_1608Metric | C1, C11, C12 |
| 7 | CGA0402X7R104K160GT 100n HRE | C_0402_1005Metric | C2, C3, C4, C5, C6, C7, C10 |
| 2 | TCC0402COG330J500AT 33p CCTC | C_0402_1005Metric | C8, C9 |
| 2 | RC0402FR-0710KL 10k YAGEO | R_0402_1005Metric | R1, R5 |
| 3 | 0402WGJ0472TCE 4k7 UNI-ROYAL(Uniroyal Elec) | R_0402_1005Metric | R2, R3, R4 |
| 1 | R | R_0402_1005Metric | R6 |
| 1 | G | R_0402_1005Metric | R7 |
| 1 | B | R_0402_1005Metric | R8 |
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