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Host a submission form on an untrusted or shared host by using public-key encryption! This repository hosts the source code for the Lockbox app, which works together with the Lockbox web app.
Lockbox is a barebones form submission app intended to be easily adaptable for different needs. It works by capturing all submitted form data and encrypting it with a (libsodium) public key before saving it. Saved data can only be read by decrypting it with your unique private key, which can be kept offline and protected however you like.
- Use the Lockbox app or the
cmd/genkeys.phpscript to generate
- Only people with the
key.privatefile can decrypt submissions -- make a backup copy of it and keep it somewhere safe! If you lose it, you won't be able to recover any submissions you haven't decrypted yet.
- Upload the web app files and your generated
key.publicfile onto a webserver that supports PHP
- Configure the form by editing
- Rename admin.php to something unpredictable if you would like to use it
- Submissions can only be decrypted using the
key.privateyou generated earlier.
- Download the encrypted
submissions.datfile either directly from your server or by using the renamed
- Use the Lockbox app or
cmd/decrypt.phpto decrypt submissions. It will output a CSV file that can be opened in any spreadsheet editor (such as Microsoft Excel or LibreOffice Calc).
Making HTML forms
- We are working on attaching an HTML form generator. For now, you can write HTML by hand or use any form editor you prefer that is capable of outputting HTML.
- The submission script will capture all form fields submitted to it.
- Field ordering is not preserved by default. If you would like spreadsheet columns to appear in a certain order, you can give your form fields a number and an underscore, for example
03_phoneetc. The Lockbox app will remove the numeric prefix when creating the spreadsheet.
- Do not name a form field
- Submission time, submission number, and submitter IP address are all added automatically.
- Lockbox's encryption is intended to protect against attackers that gain read-only access to the webserver where the form is hosted. Attackers that get access to encrypted data cannot decrypt it.
- Lockbox does not and cannot protect against attackers that can modify the web app. The app can be modified so that submissions received after the compromise are intercepted before they are encrypted. (Submissions received before such a compromise would remain safely encrypted.)