[FEATURE REQUEST] Local data encryption

[domportera]

Is your feature request related to a problem? Please describe. Quite often these applications are used to scan highly sensitive documents (esp Card Wallet) - existing on-device unencrypted can be a security risk

Describe the solution you'd like Local database encryption by default for scanned-but-not-exported documents/cards option to export PDFs with password the easiest development-wise might be to have the user be able to set a global password, stored locally (encrypted via fingerprint/android unlock) and have this global password apply to everything exported

Describe alternatives you've considered An application to encrypt once exported, though no alternative solution can exist for the apps' internal scans outside

Additional context I'm a big fan of OSS card wallet and my suggestion largely stems from that, as I am keeping these files for as long as my phone lives. I'd like it to be as secure as possible

I have not checked the source to see if you using file-based encryption already for application files, so ignore that part if you are!

Thanks!! Love your work