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96 lines
3.7 KiB
Markdown
96 lines
3.7 KiB
Markdown
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[](https://github.com/tillitis/tillitis-key1/actions/workflows/ci.yaml)
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# Tillitis TKey
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## Introduction
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The Tillitis TKey is a new kind of USB security token. What makes the
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TKey unique is that it allows a user to load and run applications on
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the device, while still providing security. This allow for open-ended,
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flexible usage. Given the right application, the TKey can support use
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cases such as SSH login, Ed25519 signing, Root of Trust, FIDO2, TOTP,
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Passkey, and more.
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During the load operation, the device measures the application
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(calculates a cryptographic hash digest over it) before running
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it on the open hardware security processor. This measurement
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is similar to [TCG DICE](https://trustedcomputinggroup.org/work-groups/dice-architectures/).
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Each TKey device contains a Unique Device Secret (UDS), which
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together with the application measurement, and an optional
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User-Supplied Secret (USS), is used to derive key material unique to each
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application. This guarantees that if the integrity of the application
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loaded onto the device has been tampered with, the correct keys
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needed for an authentication will not be generated.
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Key derivation with a User-Supplied Secret allows users to build and
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load their own apps, while ensuring that each app loaded will have
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its own cryptographic identity, and can also be used for authentication
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towards different services.
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The TKey platform is based around a 32-bit RISC-V processor and has
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128 KB of RAM. Firmware can load and start an app that is as large as
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RAM.
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All of the TKey software, firmware, FPGA Verilog source code, schematics
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and PCB design files are open source. Like all trustworthy security software
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and hardware should be. This in itself makes it different, as other
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security tokens utilize at least some closed source hardware for its
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security-critical operations.
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*The TK1 PCB, the first implementation of the TKey.*
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## Getting started
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The official website is [tillitis.se](https://tillitis.se).
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The Tkey can be purchased at
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[shop.tillitis.se](https://shop.tillitis.se).
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TKey software developer documentation is available in the [TKey
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Developer Handbook](https://dev.tillitis.se).
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Specific documentation regarding implementation is kept close to the
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code/design in README files, typically in the same directory.
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## Tkey Device Apps
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Offically supported apps can be found at
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[tillitis.se](https://tillitis.se/download/)
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The source and other projects from us can be found here at our
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[GitHub](https://github.com/tillitis).
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Other known (but not all) projects can be found at
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[dev.tillitis.se](https://dev.tillitis.se/projects/).
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### Other noteworthy links
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* [Threat Model](doc/threat_model/threat_model.md)
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* [Release Notes](doc/release_notes.md)
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* [Quickstart for the DevKit](doc/quickstart.md). Initial programming
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if you have the "old" DevKit.
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Note that development is ongoing. To avoid unexpected changes of
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derived key material, please use a tagged release. Read the [Release
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Notes](doc/release_notes.md) to keep up to date with changes and new
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releases.
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## About this repository
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This repository contains hardware, firmware and utilities written as
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part of the TKey. It is structured as monolithic repository, or
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"monorepo", where all components live in one repository.
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Device and client applications, however, are kept in other
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repositories here at our [GitHub](https://github.com/tillitis).
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## Licensing
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See [LICENSES](./LICENSES/README.md) for more information about
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the projects' licenses.
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All contributors must adhere to the [Developer Certificate of Origin](dco.md).
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