Encryption and Decryption of Modual

[ConnorGD]

So basically i'm doing a collage project that involves me creating a real life system for a company. And I Have designed a system for a Counselling company called Arch, and they would like most of the information about the client encrypting and decrypting. However I would like to know how to encrypt my module so that any data saved to them files is encrypted. I would really appreciate it if someone helped me out with this. P.s iv read up on DES encryption and 3DES Encryption but I'm not sure how to incorporate that into my system. Below is what my module looks like and the forms that serve as the input into the module.