Implement TPM 2.0 DICE Root of Trust on Raspberry Pi 4 for Secure IoT

Implementing a TPM 2.0-based DICE Root of Trust on a Raspberry Pi 4 for Secure IoT Device Identity Management

This tutorial will guide you through the process of implementing a TPM 2.0-based DICE (Device Identifier Composition Engine) root of trust on a Raspberry Pi 4. This setup will help you manage secure identities for IoT devices effectively.

Prerequisites

• Basic knowledge of Linux command line
• Raspberry Pi 4 with Raspbian OS installed
• TPM 2.0 module connected to the Raspberry Pi
• Internet connection for downloading packages

Parts/Tools

• Raspberry Pi 4
• TPM 2.0 module (such as Infineon TPM 2.0 SLB 9670)
• Power supply for Raspberry Pi
• MicroSD card (at least 16GB) with Raspbian OS
• USB keyboard and monitor or SSH access

Steps

1. Set Up Your Raspberry Pi
   1. Boot your Raspberry Pi and ensure Raspbian OS is running.
   2. Open a terminal window or connect via SSH.
2. Install Required Packages
   1. Update the package list:

   sudo apt-get update

   2. Install the necessary libraries:

   sudo apt-get install tpm2-tools tpm2-abridge

3. Connect the TPM Module
   1. Physically connect the TPM module to the Raspberry Pi via GPIO or I2C, following the manufacturer’s instructions.
   2. Verify the connection:

   ls /dev/tpm*

   You should see a device like /dev/tpm0 listed.

4. Initialize the TPM
   1. Use the `tpm2_initialize` command to initialize the TPM:

   tpm2_clear

   2. Set a password for the owner of the TPM:

   tpm2_changeauth -o 

5. Configure DICE for Device Identity Management
   1. Create a DICE identity:

   tpm2_create -C o -u dice_identity.pub -r dice_identity.priv -L dice_identity.policy

   2. Define the DICE policies that will govern device identities.
6. Provisioning the DICE Identity
   1. Seal the identity to the TPM:

   tpm2_evictcontrol -C o -c dice_identity

   2. Verify the sealed identity:

   tpm2_readpublic -c dice_identity

7. Testing the DICE Configuration
   1. Run tests to ensure the configuration is working as expected:

   tpm2_getcap properties-fixed

Troubleshooting

• TPM Not Recognized: Ensure the TPM module is properly connected and powered.
• Permission Denied: Run commands with sudo if you encounter permission issues.
• Package Installation Failures: Check your internet connection and try updating the package list again.
• Identity Creation Issues: Verify that the TPM is initialized and that you are using the correct passwords.

Conclusion

Implementing a TPM 2.0-based DICE root of trust on a Raspberry Pi 4 allows for robust identity management in IoT devices. Following this tutorial, you should now have a functioning setup that enhances the security of your IoT deployments. Regularly update your system and TPM configurations to ensure ongoing security.