Simplify the following text for a Grade 11 native English-speaking person.
Original: Some other Internet security systems in widespread use , such as Secure Sockets Layer ( SSL ) , Transport Layer Security ( TLS ) and Secure Shell ( SSH ) , operate in the upper layers of the TCP\/IP model .
Simplified: Other Internet security protocols in widespread use , such as SSL , TLS and SSH , operate in the upper layers of these models .