To figure out what's going on, go back in your logs to see where this behavior started, then see if you added any apps or changed any settings (particularly about apps automating their actions) before that point in time.
It is highly unlikely that someone has a) found a way to invade a Mac remotely without your ACTIVE cooperation, and b) that the way you'd find out about it is through a log file rather than something "interesting" like having something corrupted or lost, or getting some external indication like losing access to an online resource or forum. If you're really worried, change your Keyring password every other day or so until you get a warm-fuzzy feeling about the root cause of these log entries. But I think you're just seeing an app doing something poorly instead of evidence of something malicious. (On the other hand, it's a good idea to figure out what is causing these log entries so the rest of us know about it and maybe the software writer can fix his/her goof.)