What a great idea. Now you know your information is secure! Though, I could see someone trying to bend the connector and fitting a cable of some sort on there. OR, being a smart ass and putting bare wires on the connection point. Maybe not as secure as you think, but still a neat idea.
Question is, if you put it on your key ring… how are you suppose to put the key into the lock? And secondly, if the key is right there and you lose you keys with the lock attached… umm kinda defeats the point. Ah well.