My guess is that you didn't install gnome-keyring package.
To avoid having those messages in /var/log/secure, you can add a - character at the beginning of the two lines mentioning pam_gnome_keyring.so in file /etc/pam.d/system-auth.
Code:
$ cat /etc/pam.d/system-auth | grep pam_gnome_keyring.so
-auth optional pam_gnome_keyring.so
-session optional pam_gnome_keyring.so auto_start
The reason is given
here
Quote:
...
If the type value from the list above is prepended with a - character the PAM library will not log to the system log if it is not possible to load the module because it is missing in the system. This can be useful especially for modules which are not always installed on the system and are not required for correct authentication and authorization of the login session.
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