End to End encryption using Codeigniter

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I'm working on a web app which will have very serious and sensitive data in it. How do I use Codeigniter on the backend and on the frontend some other library to encrypt data throughout the GET and SET process ( Client server encrypted )

https://mega.nz/#info

In this website they say they encrypt end to end. I do not know how to implement this.

Any thoughts on this please ? Any security gurus come up and give me a hand please

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Isaac On

I encrypt all my sensitive data (like ids, passwords, serial_numbers, etc.) from the backend to the front end, and when i retrieve data from the front end i just decrypt it, this way all clients that inspects my code in the front end, doesn't know the meaning of some parts, all this with some functions in a helper file, i don't know if this is what you are searching for