mirror of
https://github.com/tillitis/tillitis-key1.git
synced 2024-10-01 01:45:38 -04:00
86 lines
3.5 KiB
Markdown
86 lines
3.5 KiB
Markdown
# Tillitis TKey
|
|
|
|
## Introduction
|
|
|
|
The Tillitis TKey is a new kind of USB security token. What makes the
|
|
TKey unique is that it allows a user to load and run applications on
|
|
the device, while still providing security. This allow for open-ended,
|
|
flexible usage. Given the right application, the TKey can support use
|
|
cases such as SSH login, Ed25519 signing, Root of Trust, FIDO2, TOTP,
|
|
Passkey, and more.
|
|
|
|
During the load operation, the device measures the application
|
|
(calculates a cryptographic hash digest over it) before running
|
|
it on the open hardware security processor. This measurement
|
|
is similar to [TCG DICE](https://trustedcomputinggroup.org/work-groups/dice-architectures/).
|
|
|
|
Each TKey device contains a Unique Device Secret (UDS), which
|
|
together with the application measurement, and an optional
|
|
User-Supplied Secret (USS), is used to derive key material unique to each
|
|
application. This guarantees that if the integrity of the application
|
|
loaded onto the device has been tampered with, the correct keys
|
|
needed for an authentication will not be generated.
|
|
|
|
Key derivation with a User-Supplied Secret allows users to build and
|
|
load their own apps, while ensuring that each app loaded will have
|
|
its own cryptographic identity, and can also be used for authentication
|
|
towards different services.
|
|
|
|
The TKey platform is based around a 32-bit RISC-V processor and has
|
|
128 KB of RAM. The current firmware is designed to load an app that is
|
|
up to 100 KB in size, and gives it a stack of 28 KB. A smaller app may
|
|
move itself in memory to get larger continuous memory.
|
|
|
|
All of the TKey software, firmware, FPGA Verilog source code, schematics
|
|
and PCB design files are open source. Like all trustworthy security software
|
|
and hardware should be. This in itself makes it different, as other
|
|
security tokens utilize at least some closed source hardware for its
|
|
security-critical operations.
|
|
|
|
|
|
*The TK1 PCB, the first implementation of the TKey.*
|
|
|
|
|
|
## Documentation
|
|
|
|
### Getting started
|
|
|
|
* [Quickstart](doc/quickstart.md) to program the TKey
|
|
* [Toolchain setup](doc/toolchain_setup.md)
|
|
* [Release Notes](doc/release_notes.md)
|
|
|
|
Applications and host programs that communicate with the apps are kept
|
|
in this repository: https://github.com/tillitis/tillitis-key1-apps
|
|
|
|
### In-depth technical information
|
|
|
|
* [System Description](doc/system_description/system_description.md)
|
|
* [Threat Model](doc/threat_model/threat_model.md)
|
|
* [Framing Protocol](doc/framing_protocol/framing_protocol.md)
|
|
* [Boards](doc/system_description/boards.md)
|
|
* [Boards](doc/system_description/boards.md)
|
|
* [FPGA](doc/system_description/fpga.md)
|
|
* [Software](doc/system_description/software.md)
|
|
* [QEMU](https://github.com/tillitis/qemu/tree/tk1) (branch `tk1` in
|
|
separate repository)
|
|
|
|
Note that development is ongoing. For example, changes might be made
|
|
to the measuring and derivation of key material, causing the
|
|
public/private keys of a signer app to change. To avoid unexpected
|
|
changes, please use a tagged release. Read the [Release
|
|
Notes](doc/release_notes.md) to keep up to date with changes and new
|
|
releases.
|
|
|
|
## About this repository
|
|
|
|
This repository contains hardware, software and utilities written as
|
|
part of the TKey. It is structured as monolithic repository, or
|
|
"monorepo", where all components live in one repository.
|
|
|
|
## Licensing
|
|
|
|
See [LICENSES](./LICENSES/README.md) for more information about
|
|
the projects' licenses.
|
|
|
|
All contributors must adhere to the [Developer Certificate of Origin](dco.md).
|