How does the data encryption/tokenisation system work?

Personal data is encrypted, in other words converted to a code which can be reversed using a randomly-generated encryption key (a token). Furthermore, personal data is stored in a separate, protected database in a state of constant encryption. This data (telephone number and email address only) is used only where necessary for essential functions of the app, for example to contact you to collect a prize from the draw, and accessed by using the token temporarily and solely for the operation required.