Question: Assuming that I have a certificate that identifies me, and a timestamp from a trusted time authority, what is a good file format/other way to seal text against modification/impersonation? I know that I can seal PDFs, but I'd like to secure my daily notes and ultimately make them searchable, so a folder of sealed PDFs is somewhat inconvenient.

The ultimate goal is an electronic engineering notebook. I've been fighting with this one for years, but last night it occurred to me that I can share my problem with all of you :)

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