\x89\x50\x4E\x47\x0D\x0A\x1A\x0A PNG  \x89\x50\x4E\x47\x0D\x0A\x1A\x0A # This is an example of policy module enforcing ECDHE and ECDHE with PSK # key exchanges key_exchange = ECDHE ECDHE-PSK