I use KeePassX. I think the easiest way to break it (on Linux, at least) would be to get a program running on the user's machine, using a browser exploit or wha

I use KeePassX. I think the easiest way to break it (on Linux, at least) would be to get a program running on the user's machine, using a browser exploit or whatever, which would make a copy of the database and also sniff the X keypress events on the KeePassX window to get the master password. I don't know if it has any defence against that.