Get rid of the message: session opened for user

[Kevin Wilson]

HI,
Each time I ssh with a putty client from windows to Linux Fedora 20, I
get the following
messages in the /var/log/messages file:
sshd[772]: pam_unix(sshd:session): session opened for user xxx by (uid=yyy)

Is there a way to prevent this messages ?

Regards,
Kevin