Homebrew coder thecraziness1 dropped by the QJ.NET PSP Development Forum to release PsJournal, a password protected journal program for the PSP. The initial release features an intruder protection program to safeguard your data from possible intruders.
To install the program, just put the PsJournal Folder into the psp/game folder. For more info about the release, please check the README included in the download. The dev promises to add more features in future release.
Download: PsJournal Beta v0.1
Discuss: QJ.NET's PSP Development Forums
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