Some other MISC@1 security systems in widespread use , such as Secure Sockets Layer -LRB- SSL -RRB- , Transport Layer Security -LRB- TLS -RRB- and ORGANIZATION@1 -LRB- SSH -RRB- , operate in the upper layers of these models .

MISC@2 security protocols in widespread use , such as SSL , TLS and SSH , operate in the upper layers of these models .
