# Trusted GNSS-Based Time Synchronization for Industry 4.0 Applications
## 4 Trusted Computing
### Integrity Measurement Architecture (IMA)
Available online: [[http://doc.ntp.org/archives/drivers/driver22/](http://doc.ntp.org/archives/drivers/driver22/)]([http://doc.ntp.org/archives/drivers/driver22/](http://doc.ntp.org/archives/drivers/driver22/)) (accessed on 6 September 2021). * [PERSON] et al. (2019) [PERSON]; [PERSON]; [PERSON] [PERSON] PTPd Official Source--Precision Time Protocol Daemon (1588-2008). [Online]. 2019. Available online: [[https://github.com/ptpd/ptpd](https://github.com/ptpd/ptpd)]([https://github.com/ptpd/ptpd](https://github.com/ptpd/ptpd)) (accessed on 6 September 2021). * Trusted Computing Group (TCG). Trusted Platform Module Library Specification, Family 2.0, Level 00, Revision 01.59. [Online]. 2019. Available online: [[https://trustedcomputinggroup.org/resource/tpm-library-specification/](https://trustedcomputinggroup.org/resource/tpm-library-specification/)]([https://trustedcomputinggroup.org/resource/tpm-library-specification/](https://trustedcomputinggroup.org/resource/tpm-library-specification/)) (accessed on 6 September 2021). * (48) Infineon Technologies AG. OPTIGAT(tm) TPM Application Note. Integration of an OPTIGAT(tm) TPM SLx 9670 TPM2.0 with SPI Interface in a Raspberry Pi(r) 4 Linux Environment. [Online]. 2019. Available online: [[https://www.infineon.com/dgdl/Infineon-OPTIG_SLx_9670_TPM_2_0_Pi_4_ApplicationNotesv07_19_EN.pdf?fileId=5546d4626c1f3](https://www.infineon.com/dgdl/Infineon-OPTIG_SLx_9670_TPM_2_0_Pi_4_ApplicationNotesv07_19_EN.pdf?fileId=5546d4626c1f3) dc3016c3d19f43972 eb]([https://www.infineon.com/dgdl/Infineon-OPTIG_SLx_9670_TPM_2_0_Pi_4_ApplicationNotesv07_19_EN.pdf?fileId=5546d4626c1f3](https://www.infineon.com/dgdl/Infineon-OPTIG_SLx_9670_TPM_2_0_Pi_4_ApplicationNotesv07_19_EN.pdf?fileId=5546d4626c1f3) dc3016c3d19f43972 eb) (accessed on 6 September 2021). * (49) [PERSON] Cryptsetup TPM Incubator. [online]. 2019. Available online: [[https://github.com/[PERSON]/cryptsetup-tpm-incubator/tree/luks2](https://github.com/[PERSON]/cryptsetup-tpm-incubator/tree/luks2) tpm]([https://github.com/[PERSON]/cryptsetup-tpm-incubator/tree/luks2](https://github.com/[PERSON]/cryptsetup-tpm-incubator/tree/luks2) tpm) (accessed on 6 September 2021). * (50) [PERSON]; [PERSON]; [PERSON]; [PERSON] Design and Implementation of a TCG-based Integrity Measurement Architecture. In Proceedings of the 13 th USENIX Security Symposium (USENIX Security 04), San Diego, CA, USA, 9-13 August 2004. * (51) [PERSON]; [PERSON] Integrity Measurement Architecture. [Online]. 2017. Available online: [[https://sourceforge.net/p/linux-ima/wiki/Home/](https://sourceforge.net/p/linux-ima/wiki/Home/)]([https://sourceforge.net/p/linux-ima/wiki/Home/](https://sourceforge.net/p/linux-ima/wiki/Home/)) (accessed on 6 September 2021). * (52) [PERSON] The Transport Layer Security (TLS) Protocol Version 1.3, RFC 8446. [Online]. 2018. Available online: [[https://www.rfc-editor.org/info/rfc8446](https://www.rfc-editor.org/info/rfc8446)]([https://www.rfc-editor.org/info/rfc8446](https://www.rfc-editor.org/info/rfc8446)) (accessed on 6 September 2021). * (53) Raspberry Pi(r) Trading Ltd. Raspberry Pi(r) 4 Computer Model B, Product Brief. [Online]. 2021. Available online: [[https://datasheets.raspberrypi.org/rpi4/raspberry-pi-4-product-brief.pdf](https://datasheets.raspberrypi.org/rpi4/raspberry-pi-4-product-brief.pdf)]([https://datasheets.raspberrypi.org/rpi4/raspberry-pi-4-product-brief.pdf](https://datasheets.raspberrypi.org/rpi4/raspberry-pi-4-product-brief.pdf)) (accessed on 6 September 2021). * (54) [PERSON] MosaicHAT: An Open Source Raspberry Pi HAT Based on Septentrio's Mosaic-X5. [Online]. 2020. Available online: [[https://github.com/septentric-gnss/mosaicHAT](https://github.com/septentric-gnss/mosaicHAT)]([https://github.com/septentric-gnss/mosaicHAT](https://github.com/septentric-gnss/mosaicHAT)) (accessed on 6 September 2021). * (55) Septentrio NV. Mosaic-X5(tm): Compact, Multi-Constellation GNSS Receiver Module. [Online]. 2021.