530584 CSV upload to Mysql and encrypt

I need someone to build me an upload function this is what it must do: -Upload a csv file using the drupal website -Overwrite all existing data in database -Encrypt all data on upload into the mysql database -Decrypt all data when client views it from the website. This function will be all web based, nothing will be downloaded to the client computer. The client will log into their account and view this data, but if the mysql database gets hacked all data is encrypted. BONUS: if you can build in a salting function that would be great, but not necessary.