# Scdrand systemd service (and Gentoo ebuild)
**URL:** https://support.nitrokey.com/t/scdrand-systemd-service-and-gentoo-ebuild/1164
**Category:** Nitrokeys
**Created:** [June 12, 2018, 8:14am UTC](https://support.nitrokey.com/t/scdrand-systemd-service-and-gentoo-ebuild/1164 "2018-06-12T08:14:14Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@comio](https://support.nitrokey.com/u/comio)
#### Post date: [June 12, 2018, 8:14am UTC](https://support.nitrokey.com/t/scdrand-systemd-service-and-gentoo-ebuild/1164/1 "2018-06-12T08:14:15Z")
Hi Folks,
In order to use the Nitrokey Pro’s TRNG, I implemented a stupid systemd unit file (associated to a selfmade Gentoo ebuild) that uses scdrand tool from scdtools:
[https://raw.githubusercontent.com/comio/comio-overlay/master/app-crypt/scdtools/files/scdrand.service](https://raw.githubusercontent.com/comio/comio-overlay/master/app-crypt/scdtools/files/scdrand.service)
To use, after the scdrand installation with suid or CAP\_SYS\_ADMIN capabilities:
- copy the previous file into /etc/sysemd/user or /lib/systemd/user or, again, /usr/lib/systemd/user
- systemctl --user daemon-reload
- systemctl --user enable scdrand
- systemctl --user start scdrand
You can find the complete ebuild package here:
> **[comio-overlay/app-crypt/scdtools at master · comio/comio-overlay](https://github.com/comio/comio-overlay/tree/master/app-crypt/scdtools)**
>
> master/app-crypt/scdtools
Enjoy
ciao
luigi
---
### Author:  [@nitroalex](https://support.nitrokey.com/u/nitroalex)
#### Post date: [June 14, 2018, 7:32am UTC](https://support.nitrokey.com/t/scdrand-systemd-service-and-gentoo-ebuild/1164/2 "2018-06-14T07:32:04Z")
Hey,
thank you very much. I did a small note [here](https://www.nitrokey.com/documentation/frequently-asked-questions#can-i-use-nitrokey-as-a-true-random-number-generator-trng). Please let me know if you see another place where this information might be useful as well.
Kind regards
Alex
---
### Author:  [@comio](https://support.nitrokey.com/u/comio)
#### Post date: [June 14, 2018, 8:13am UTC](https://support.nitrokey.com/t/scdrand-systemd-service-and-gentoo-ebuild/1164/3 "2018-06-14T08:13:31Z")
Thank you too.
It’s fine for me.
ciao
luigi
---
### Author:  [@nitroalex](https://support.nitrokey.com/u/nitroalex)
#### Post date: [June 14, 2018, 10:01am UTC](https://support.nitrokey.com/t/scdrand-systemd-service-and-gentoo-ebuild/1164/4 "2018-06-14T10:01:05Z")
To avoid confusions: This now moved to [the documentation](https://www.nitrokey.com/documentation/applications#p:nitrokey-pro&os:linux&a:true-random-number-generator-trng).