can't decrypt on new server

[TihomirS]

Hi,

I use this simple class on one of my projects.
I use it only with custom key:
Cryptor::Encrypt('ala-bala@gmail.com', $kkey);
on this server, all works ok.

But I need to go to a new one .. after code transfer and get data from DB I can't decrypt encrypted data..
I get some utf string like - ί�]�͇�a���Mٗ�����6����

If I re-encrypt string and decrypt it all is working fine again .. what I miss?
How to use it to be able to future data transfer to a new server?

P.S. I use the same PHP version on same ubuntu servers
PHP Version 7.2.24-0ubuntu0.18.04.4