Unix and Unix-like Systems
The FreeS/WAN and forks such as Openswan and strongSwan offer VPNs which can also operate in OE mode using IPsec based technology. Obfuscated TCP is another method of implementing OE.
Read more about this topic: Opportunistic Encryption
Famous quotes containing the word systems:
“I am beginning to suspect all elaborate and special systems of education. They seem to me to be built up on the supposition that every child is a kind of idiot who must be taught to think.”
—Anne Sullivan (1866–1936)