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README.md

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+# Encrypted form
+This is a small project to send encrypted form data to a recipient.
+The data is encrypted using the form recipient's PGP key.
+
+## Requirements
+Apache/NGINX with PHP and the GnuGP PHP module. The module is installed with 
+`apt install php-gnupg` on Debian and Ubuntu systems.
+
+The Apache/NGINX process also needs write permission to the GnuPG home
+directory (set the GnuPG home directory in `contact.php`).
+
+You also need to set the following variables in `contact.php`:
+
+* `$recipient` (email of the form recipient)
+* `$subject` (a subject line for the email)
+* `$key` (the **public** PGP key of the recipient)
+* `$fingerprint` (the fingerprint of the public PGP key)
+