Collecting data to demonstrate TCP ISN-based port knocking

[Julian Kirsch]

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Hi list,

some of you might remember the proposal of a patch which implements a
variant of port-knocking that can be used to check the authenticity of
arbitrary TCP connections and even can do integrity checking of TCP
payload data by using a pre-shared key [0]. This patch, as well as a
research paper describing its inner workings are available on
gnunet.org under the name "Knock" [1].

As Knock uses two fields in the TCP header in order to hide
information and we explicitly want to be compatible with machines
sitting in typical home networks, we need to make sure that this
information doesn't get corrupted by the majority of NAT boxes out
there. The lack of hard data on this also was one of the objections
when the patch was submitted last time. We thus created a program
which tests if Knock could work in your environment. It would be
greatly appreciated if some of you were able to execute the program on
their machines in order to help us to get an estimation of if Knock
one day could be used in a large scale.

You can find sources, binaries and a more elaborate description here:
https://gnunet.org/knock_nat_tester


Best,
Julian Kirsch

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[0] https://lkml.org/lkml/2013/12/10/1155
[1] https://gnunet.org/knock
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