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# NTPsec

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From ArchWiki

Related articles

- Network Time Protocol daemon
- Time synchronization

The NTP is an unencrypted UDP based protocol and has been abused for attacks in the past. There have been several attempts to provide replacements, however the difficult nature of the protocol and its usage make this quite challenging. While the NTP provides capabilities for encryption, they have been proven to be unreliable. With NTPsec a 'secure' replacement is possible.

## Installation

You can install NTPsec via the ntpsecAUR package.

It is necessary to import a new GPG key to your keyring with:

    $ gpg --recv-keys 5A22E330161C3978

    gpg: key 5A22E330161C3978: 6 signatures not checked due to missing keys
    gpg: key 5A22E330161C3978: public key "NTPsec Contact <contact@ntpsec.org>" imported
    gpg: marginals needed: 3  completes needed: 1  trust model: pgp
    gpg: depth: 0  valid:   8  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 8u
    gpg: next trustdb check due at 2019-12-03
    gpg: Total number processed: 1
    gpg:               imported: 1

## Starting the service

Normally start/enable the `ntpd.service`.

Note: Currently, ntpsecAUR will only uninstall ntp during its installation. If you were using another NTP implementation, make sure to stop/disable the service

## Enable NTS

NTS is a method for using TLS/SSL to authenticate NTP traffic on the net

Note: The NTP Pool and the Arch NT Pool does not currently support NTS.

Append the keyword `nts` to the end of your server lines. Do this only for servers that speak NTS. If the server uses a port other than `4460` for NTS key exchange, you also need to specify the port number.

For example:

    /etc/ntp.d/use-pool

    server time.cloudflare.com         nts iburst
    server virginia.time.system76.com  nts iburst
    server nts.netnod.se:4460          nts iburst

Here is an unofficial list of NTP servers supporting NTS.

Warning: You should not pick some random hosts from the Internet but ask your local authorities, other public entities, or corporations with existing NTP service to add NTS.

## See also

- Wikipedia:Network Time Protocol#NTPsec
- NTS-QuickStart

Category:

- Network Time Protocol