Javascript/Html Server side verification

There's isn't a way from preventing someone from taking pot-shots at your data. But you can obfuscate whats going on.
https://paragonie.com/blog/2015/09/compr...ion-in-php

Ok sounds good what im thinking is creating to
send a crypted version of the user id instead using $this->load->library('encryption');

this gives a huge number but a user wanting to try change that value wont be very successful

then when data is sent i can decrypt the value and check it up agaisnt the value in the db

what you think

and is there a way to have shorter encrypted responces?