I use
Nice Start as the password to get into my PPC. It can be set to allow a certain number of login attempts and after that number, it will freeze for a preset period of time that you select (e.g. 10 minutes, 15 minutes) before it will allow anymore tries. You can also set it to hard reset after a certain number of attempts, if you want.
I also don't keep anything confidential on my SD card or file store because a hard reset does nothing to the info on the card or file store. There are programs available to protect these "card" applications, but I prefer to keep all confidential stuff in my RAM memory.