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New Project: EnactTrust

Hello and welcome back,

Dimitar from shared a new project:" EnactTrust, Attestation as a Service"

Dimitar allowed me to copy the article and share it with you :-)

The article was copied from, Author Dimitar Tomov,

Hello everyone,

Today, I want to share with our community something that a small group of us have built to help raise the adoption of some of TPM's advanced features:

Attestation as a Service

Mitko Vasilev who helped figure out the building blocks gives this overview:

EnactTrust is Remote Attestation as a Service for Linux and Windows systems with TPM chips.

You can use the TPM hardware root of trust for reporting to verify the integrity of any file or application on the system.

Svetlozar Kalchev who helped build our cloud infrastructure, backend, and frontend, is eager to welcome early adopters and asked me to share just this line:

We are excited to announce that signups for the EnactTrust beta are now open!

You can sign-up for our beta here.

Now, let's get down to the nitty-gritty details of how our beta works:

- Using our open-source agent app you can attest up to three nodes. The number of nodes can be unlimited. We are starting with up to three nodes just for the beta.
- EnactTrust agent app currently has two flavors - C and Golang.
- EnactTrust agent app generates Attestation Keys under the Owner Hierarchy of the TPM.
- EnactTrust agent app does not use the TPM's EK public key. We want to preserve the privacy of the user's TPM and user's node that will be attested because we expect most will first test on personal computers.
- EnactTrust backend for the public beta is cloud-based, although it could also be run on-premise. We want to offer something easy to try that does not depend on centralized servers. This is a major difference between EnactTrust and Microsoft AzureSphere or Intel's SGX.
- Every user has his own dashboard that is web-based. It is written in React.
- After you sign up for the beta, we will send you a unique user ID. Using this user ID you could log in to your EnactTrust dashboard.
- At the first launch of the EnacTrust agent on a new node, you have to enter your unique user ID and your node will be automatically added to your dashboard.
- Everyone who signups for our beta will be contacted when we launch EnactTrust.

I will pause with details for now and ask for feedback and questions. To join our beta sign-up here.


You could join the beta phase here:

I'll try EnactTrust on the Pi with one LetsTrust-TPM,

Bye for now!


Pandemic Update to "More Hardware: LetsTrust-TPM2Go"

Hello and welcome back,

Update from 2021.02.08:

I'm not really happy about the next lines but I want to be honest to all of you and it was more personal as all the other posts:

Since the last few months we have had a hard lockdown depend on the pandemic situation in Bavaria/Germany. My seven years old daughter stays at home for over seven weeks, schools are closed, see some friends it's not possible (family reasons).

I'll spend more time with my Family the next weeks.

What happens to the LetsTrust-TPM2Go:

The Project was stopped. New preorders were cancelled and all orders were unwound.

The Reason: I don't want to sell and deliver hardware for that I could not guarantee 100% functionality.
Continue reading "Pandemic Update to "More Hardware: LetsTrust-TPM2Go""
Categories: TPM

A recommendation!

Hello and welcome,

today I'll want to introduce Johannes Holland, a really nice guy, MSc, and TPM addicted.
I know Johannes personally and he also tested and validated the first revision of the LetsTrust-Arduino adapter, for which I am very grateful to this day!

And you all know Peter Huewe? He was the driver behind this.

At the next Open Source Summit, Johannes and Peter will speak over the TSS FAPI and the abstract gives great hope for an informative session.

The abstract:
Nowadays, virtually all consumer PCs/laptops contain a TPM2.0 security chip, the Trusted Platform Module. Moreover, the TPM finds its way into more and more modern embedded devices. But what is the TPM and how can we use it on Linux? The TPM has the potential to enhance security in a variety of use cases ranging from SSH, VPN, disk encryption, and more. Since it is so powerful, it may be hard to use at times. But do not fret - the tpm2-software project, especially its new TPM Software Stack (TSS) Feature API (FAPI) library, enables anyone to use the TPM. This talk gives an introduction on how to use the TPM the easy way, using recent contributions to the TPM ecosystem like the TSS FAPI. After a brief overview of the involved hard- and software, this talk will dive into how to get started with the TPM and show how it can be used to perform fundamental security tasks. Afterwards, recent additions like the TPM PKCS11 middleware and the OpenSSL engine will be presented - enabling TPM integration, perhaps without writing a single line of code. In the end, the TPM open source ecosystem will be discussed, and how to become part of it. Want to start hacking? We got you.

Here you find the link to the session

Bye for now!


Categories: TPM

A second recommendation!

Hello and welcome!

Today a hint to the miniConf (online)

Short facts:
2 Days
10 Speakers
7 am PDT / 17:00 EEST 21st of October
7 am PDT / 17:00 EEST 22st of October

The speakers come from:, IBM, embed, wolfSSL, Nokia Bell Labs, Google, Intel and RedHat!

The schedule:

Day 1 - 21st of October

7 am PDT / 17:00 EEST
Making Remote Attestation a mass practice
Dimitar Tomov, Founder of

8 am PDT / 18:00 EEST
TBC / Trusted Computing and UEFI
Ken Goldman, IBM

9 am PDT / 19:00 EEST
Trustworthy 2020 Platforms: Mighty Mini AMD for Digital Work, Play, and Currencies
Piotr Król, 3mdeb

10 am PDT / 20:00 EEST
(working title) Real-life examples of wolfTPM and wolfBoot
David Garske, wolfSSL

Day 2 - 22nd of October

7 am PDT / 17:00 EEST
Attestation meets Safety-Critical Systems
Ian Oliver, Nokia Bell Labs

8 am PDT / 18:00 EEST
Remote Attestation at Enterprise Scale
Mathew Garret, Google

9 am PDT / 19:00 EEST
TBC / What’s next for TSS2, FAPI and PKCS 11
William Roberts, Intel

10 am PDT / 20:00 EEST
The Secure Enclaves and Attestation
Ilhan Gurel

11 am PDT / 21:00 EEST
An introduction to Keylime’s Remote Attestation
Michael Peters, RedHat

I will join, and you?

Please, read the next recommendation for the end of October:!.html

Bye for now!


Categories: TPM

New Project! PoC: Zepher TPM2 Software Stack

Hello and welcome,

I've got a link from a good friend of mine, and I want to share this with you:

Proof of Concept: Zepher TPM2 Software Stack

This repo tests the requirements (Code size and Memory size) for running tpm2-tss on Zephyr. The PoC is implemented on top of the Enhanced System API (ESAPI), since the Feature API (FAPI) adds additional dependencies to JSON-C and OpenSSL. Moreover, the tpm2-tools are also implemented on top of ESAPI, therefore the ESAPI should be sufficient.

And I'm really proud to see the first public-project that used the "new" Arduino2LetsTrust-Header. (I'll introduce the ArduinoAdapter in the next few days).

Bye for now!

Categories: TPM

Hello and welcome back!

Today I'm really happy and proud to introduce a new community around TPMs: was founded by Dimitar Tomov is a smart guy and he wants the same thing as I: Secure the world, a little more. wants to be a platform:
To discuss security toppings. (mostly TPM related)
For help if you stuck on your project. (offside an old school mailing list)
Collect more useful stuff around TPMs and OpenSourceSoftware for that.

And between Lockdown there is a funny little meetup every wednesday over MS-Teams. Really interesting people are there (some of them are customers of LetsTrust-TPMs ^__^)

So feel free to join the community!

Bye for now!


Categories: TPM

New fun fact!

Welcome back!

A few weeks ago Mr. M.P. write me an email with the question: May it possible to drive two TPMs on one Pi (4)?

Mr. M., want to drive one native TPM for the Pi and a second TPM as a remote vTPM for a client application.

So i've tested the Hardware Setting for Mr. M., after a few Minutes and combine this two posts:

Here the results:

Electrical- and mechanical-setting:

Hardware configuration of the two TPMs:

and you'll need 2 TPMs, with one 0Ohm Resistor on position CS0. [1]

Linux log

I hope this will be helpful for you, too.

Bye for now!


Categories: TPM

A new project is online!

Hello and welcome back!

Today I'll introduce you to a new TPM project.

Pierre Fontaine combines a Raspberry Pi, Yocto and a TPM.
He invested a lot of time on his project and I'll appreciate his work with a blogpost here, here is a qoute from his website:

The Raspberry, Yocto Project and The TPM!

In the cybersecurity field we need to play with crypto primitives. It allows us to authenticate for services (ssh, vpn ...), encrypt files for confidentiality, sign mail for proving your identity to the recipient, and even securing the boot of a complex device ...

So you do need to store keys and use crypto algorithms such as RSA, ECDH, AES compliant with some criteria (industry, military, medical ...).

Thank you Pierre to share you knowledge!

Here is the Link:
Raspberry Pi, Yocto and a TPM

By for now!


[1] © Copyright 2019. Jerome Blanchard, Romain Brenaget and Pierre Fontaine
Categories: TPM

aws iot greengrass with TPMs

Welcome to the November of posts,

Today: Using a Trusted Platform Module for endpoint device security in AWS IoT Greengrass!

The credits goes to:
The Infineon guys for build an example for use a TPM and pkcs11 in an AWS IoT greengrass environment and share it on github[1].
And Krishnan Ganapathy from amazon web services writes a blog article about it[2].

Thanks for the great work!

Bye for now!



Categories: TPM

Move LetsTrust-TPMs to CS0


The last time i get some questions about the chipselect configs for the module.

How you could move the default config from the LT-TPM CS1 to CS0.

If you want to use the TPM with CS0 you must change (resolder) the position of the 0Ohm Resistor to the open pads.

You'll see the difference if you open both pdfs:

If you don’t want to compile your device-tree-overlay by yourself, copy the tpm-slb9670-cs0.dtbo [1] to /boot/overlays/ and load the dtbo in the /boot/config.txt
over the setting dtoverlay=tpm-slb9670-cs0

If you want to decompile change and recompile the devicetree for the slb9670 for yourself:

1) sudo apt-get install device-tree-compiler
2) dtc -I dtb -O dts -o /mnt/boot/overlays/tpm-slb9670.dts /mnt/boot/overlays/tpm-slb9670.dtbo
3) cp mnt/boot/overlays/tpm-slb9670.dts /mnt/boot/overlays/tpm-slb9670-cs0.dts
4) dtc -I dts -O dtb -o /mnt/boot/overlays/tpm-slb9670-cs0.dtbo /mnt/boot/overlays/tpm-slb9670-cs0.dts

Bye for now!



PS: this will only work on the Raspberry Pis 0-4
Categories: TPM