Public bug reported:

========================================================
Description:    Ubuntu 9.10
Release:        9.10
openssh-server:
  Installed: 1:5.1p1-6ubuntu2
  Candidate: 1:5.1p1-6ubuntu2
  Version table:
 *** 1:5.1p1-6ubuntu2 0
        500 http://us.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status
========================================================

If you disable password authentication in sshd_config
(PasswordAuthentication no) and attempt to log in with an incorrect key,
a failed login attempt entry should appear in auth.log, as it does with
username/password authentication.  Nothing is logged though.

If you change "LogLevel INFO" to "VERBOSE" in /etc/ssh/sshd_config you
do get an entry as below but it isn't enough to indicate a potential
issue :

"Dec 31 18:17:33 localhost sshd[8011]: Connection from 82.23.xx.yy port
38583"

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New

-- 
OpenSSH does not log failed attempts when key authentication is used
https://bugs.launchpad.net/bugs/501956
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