Creating secure registration and authorization in PHP?

Question

PHP

Please advise how you can safely create authorization and registration on the site, or literature where this is described in detail.

Answer 1

Store open data in cookies, and a hash of this data + private key
On the server side, when reading from cookies, validate this data by hash if the cookies have changed the hash will not match!

Answer 2

First, define your security criteria. If you want to securely store your password, this is one thing. If you want, for example, to encrypt user data using a new guest algorithm, this is different. In general, study the implementation in any of the frameworks.