Secure It is based on the well-known Blowfish and MD5 algorithms.
Go to http://www.brisse.dk/palm/secureit for the full scoop!

Update Description:
v2r13 (2003-01-23):
- Security Fix: Secure It erases the clipboard before exiting so that anything stored in the clipboard when Secure It executes is not compromised when Secure It exits.
- Thanks to Mario Chisari for spotting that one!

v2r12 (2003-10-16):
- BugFix: log out when pressing the power key also works on visors.

v2r11 (2003-05-27):
- If you are in a edit view and switches to another application your data in the fields are now saved - the next time you open Secure It you will open up in the edit mode of the saved data (Zdenek Buk).
- Secure It only logs out if the system is powered down when pressing the power key - pressing and holding the power key toggles backlight as it should (Zdenek Buk).
- Hires icons created by Jeroen Witteman.

v2r10 (2003-03-08):
- Fixed a memory bug.
- German version of Secure It (Christian Bolz).
- Moved the Webpage from www.schau.com/palm/sit to www.schau.com/sit.

Reviews:

***** [May 13, 2004] by Adam
Excellent program, simple and easy to use, thanks Brian for a very good piece of work...

***** [May 30, 2003] by Marc
Powerful, very flexible and reliable it's definitely a great application to store all your sensible data. It only lacks a desktop companion to compete with "best of breed" commercial software in this category. Anyway, thanks for this very nice piece of work, including translation.

***** [Apr 26, 2003] by Art Jones
This is the program for everyone that wants a really secure storage vault. Settings include an "erase all" data function, if your palm is lost and someone tries to hack your passcode.

***** [Dec 11, 2002] by David
A lot of programs out that do what this program does but SecureIt does it better, more intuitively and with the smallest learning curve. Especially like the templates; almost like customizing your fields.