[TxMt] encryption command advice for TM "journal"

I had been using Jotz (until it became Bloatz), then MacJournal and tried DevonThink (which I may still purchase--it's pretty cool). But since I have TM open all the time anyway I have an "info" project where I store various bits of data. There's no RTF or images but I can live without them and I like the portability of plain text.

What I would like is an on-the-fly encryption -- i.e. select the text and run a command to encrypt it (with a pre-set password). Then I could store bank data etc securely.

Any tips on how this might be done? I know there is command-line encryption of various kinds but I'm not sure how I could store a password w/in TM for global use.

thanks! Paul

PS looking forward to the new PHP bundle!