How can I encrypt user materials on the site (texts, images, other files)?

Question

Yii

As I think... a key is attached to a group of users and all materials are automatically encrypted by it somehow... but how to organize this process so as not to strain the server too much?

Answer 1

mcrypt, you can choose the degree of algorithm security, which is directly proportional to the costs
php knows how to work with mcrypt
Think about where and how you will store keys to user storages
For example, CodeIgniter can encrypt user data. You can use, or just peep how it's done.