•layer 7- encrypt email with PGP
•layer 5- encrypt session data with SSL or TLS
•layer 3- encrypt network layer data with IPSec
•layer 2- encrypt data link layer data with MACsec
•layer 5- encrypt session data with SSL or TLS
•layer 3- encrypt network layer data with IPSec
•layer 2- encrypt data link layer data with MACsec