Ubuntu. Which service or process writes these lines to syslog?

Question

linux

Hello.
Ubuntu 18.04
In /var/syslog I sometimes notice these lines:

Feb 23 23:38:50 odroid systemd[1]: Created slice User Slice of root.
Feb 23 23:38:50 odroid systemd[1]: Starting User Manager for UID 0...
Feb 23 23:38:50 odroid systemd[1]: Started Session c97 of user root.
Feb 23 23:38:51 odroid systemd[23148]: Listening on GnuPG cryptographic agent and passphrase cache.
Feb 23 23:38:51 odroid systemd[23148]: Starting D-Bus User Message Bus Socket.
Feb 23 23:38:51 odroid systemd[23148]: Listening on GnuPG cryptographic agent and passphrase cache (access for web browsers).
Feb 23 23:38:51 odroid systemd[23148]: Reached target Timers.
Feb 23 23:38:51 odroid systemd[23148]: Listening on GnuPG cryptographic agent (ssh-agent emulation).
Feb 23 23:38:51 odroid systemd[23148]: Reached target Paths.
Feb 23 23:38:51 odroid systemd[23148]: Listening on GnuPG network certificate management daemon.
Feb 23 23:38:51 odroid systemd[23148]: Listening on GnuPG cryptographic agent and passphrase cache (restricted).
Feb 23 23:38:51 odroid systemd[23148]: Listening on REST API socket for snapd user session agent.
Feb 23 23:38:51 odroid systemd[23148]: Listening on D-Bus User Message Bus Socket.
Feb 23 23:38:51 odroid systemd[23148]: Reached target Sockets.
Feb 23 23:38:51 odroid systemd[23148]: Reached target Basic System.
Feb 23 23:38:51 odroid systemd[1]: Started User Manager for UID 0.
Feb 23 23:38:51 odroid systemd[23148]: Reached target Default.
Feb 23 23:38:51 odroid systemd[23148]: Startup finished in 559ms.

Please tell me who writes these lines?

Answer 1

These lines appear when a user logs into the system via ssh or sftp.
Here I am logged in as root user by key.

Answer 2

What exactly is embarrassing? This

Listening on GnuPG cryptographic agent and passphrase cache.

and subsequent similar?
Looks like this here: https://gnupg.org/