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Improve wording of what makes TK1 unique

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Signed-off-by: Joachim Strömbergson <joachim@assured.se>
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Joachim Strömbergson 2022-11-21 15:35:43 +01:00
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## Introduction
Tillitis Key 1 is a new kind of USB security token. All of its
software, FPGA logic, schematics, and PCB layout are open source, as
all security software and hardware should be. This in itself makes it
different, as other security tokens utilize closed source hardware for
its security-critical operations.
Tillitis Key 1 (TK1) is a new kind of USB security token. What makes
the TK1unique 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 TK1 can support use
cases such as SSH login, Ed25519 signing, Root of Trust, FIDO2, TOTP,
Passkey and more.
What makes the Tillitis Key 1 security token unique is that it doesn’t
verify applications, it measures them (hashes a digest over the
binary), before running them on its open hardware security processor.
During the load operation, the device measures the application
(calculates a cryptographic hash digest over the) before running
it on the open hardware security processor. This measurement
is similar to [TCG DICE](https://trustedcomputinggroup.org/work-groups/dice-architectures/).
Each security token contains a Unique Device Secret (UDS), which
together with an application measurement, and an optional
Each TK1 device contains a Unique Device Secret (UDS), which
together with the application measurement, and an optional
user-provided seed, is used to derive key material unique to each
application. This allows users to build and load their own apps, while
ensuring that each app loaded will have its own cryptographic
identity. The design is similar to TCG DICE. The Tillitis Key 1
platform 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 want to move itself in memory to get larger continuous
memory.
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.
The key derivation with user provided seed 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 TK1 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 TK1 software, FPGA logic, schematics, and PCB layout are
open source, as all security software and hardware should be. This in
itself makes it different, as other security tokens utilize closed source
hardware for its security-critical operations.
![Tillitis Key 1 PCB, first implementation](doc/images/mta1-usb-v1.jpg)
*Tillitis Key 1 PCB, first implementation*