Keycard For Developers
Keycard For Developers
If you're a developer/builder and you want to build your own secure element, we provide these unfused cards where you can load yourself the applets of your choice (e.g. keycard applet) or build your own software.
The only limit to what you can do with these cards is your imagination! Join the ecosystem of projects that build around Keycard!
The card reference is a J3R200 from NXP, and is part of the JCOP4 P71 family. It's a dual interface card (NFC and contacts) with 200Kb of flash and Javacard 3.0.5.
These cards come in white only.
For security reasons, these cards don't include a keycard certificate. This won't prevent you from using the card with Shell or Status desktop/mobile, but you will get a warning message when you use it.
Follow this guide to build your own Keycard.
In the box
- 1× Keycard for developers (white)
Key features
Load any Javacard applet
Build your own secure element
Dual interface: NFC and contact
200 KB flash storage
No battery, no charging
Same chip as consumer Keycard
Why should you build with Keycard?
Open platform
Unfused JCOP4 P71 — no restrictions on what you build. Your applet, your rules.
Active ecosystem
Build on top of a working ecosystem. Status and Sparrow already support the Keycard applet.
100% open source
Keycard applet is MIT-licensed. Start from a production-grade reference implementation.
EAL6+ certified hardware
The same secure element used in the consumer Keycard — the highest Common Criteria level for smart cards.
Tech specs
| Form factor | ISO 7810 ID-1 — 85.6 × 54 × 0.76 mm |
| Chip | J3R200 from NXP (JCOP4 P71 family) |
| Secure element | EAL6+ certified |
| Interfaces | NFC (ISO 14443) + contact (ISO 7816) |
| Flash | 200 KB |
| Javacard | 3.0.5 |
| Color | White only |