Web Site Forms/Data Encryption

I have written many web site forms that take user data and add or update an entry in a back-end database, and/or write data to CSV. I have also written numerous scripts to rotate log files daily, and to do something with the rotated files (typically email it to the client).

I sometimes also create an admin interface; this can frequently end up a much bigger project than the initial form. On MySQL projects I find much of the administration interface can be done by phpMyAdmin, which is friendly enough even for a non-programmer to use effectively.

I have used gpg and pgp to encrypt data that is sent out, and have a solid understanding of public key encryption.