Any Palm OS hardware
Palm OS 3.1

TopSecret is a security program (Password Keeper) that keeps all your sensitive data safe. Only you can access your data with a single encrypted password. All you need is your master password to access your records. Use it to store user names, passwords, credit card information, bank accounts, frequent flyer accounts, and other personal data.

TopSecret contains a Palm OS application, a PC (Windows 95/98/NT/2000/ME/XP) application, and a HotSync conduit for synchronizing your Top Secret data between the PC and handheld. Automatic synchronization provides instant access to your data on both your handheld and desktop computer. Download a trial version of TopSecret and begin evaluating it now.