Encrypt Database Content

Hi,

A question. You can change the content after pressing the submit button before saving it into the database. Here I encrypt the data with a function on ‘cfdb_form_data’.

But where/how can I decrypt the data before viewing it in the backend?
Is there a hook/filter/action where i can apply the decryption function before viewing it in the backend?

http://ww.wp.xz.cn/plugins/contact-form-7-to-database-extension/