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[tor-talk] TCP Stealth - Improved Kernel-Based Port-Knocking in Linux


This work could be of interest for the TOR project.

"TCP Stealth replaces the traditional random TCP SQN number with a token
that authenticates the client and (optionally) the first bytes of the TCP
payload. Clients and servers can enable TCP Stealth by explicitly setting
a socket option or linking against a library that wraps existing network
system calls."

"Finally, applications that try to enable users to cicrumvent censorship âsuch as Tor bridges [5]â may want to hide their existence from scans by censors."
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