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[tcpm] Privacy problems of TCP Fast Open

Erik Sy <sy@informatik.uni-hamburg.de> Fri, 10 May 2019 12:14 UTC

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From: Erik Sy <sy@informatik.uni-hamburg.de>
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Date: Fri, 10 May 2019 14:14:46 +0200
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Subject: [tcpm] Privacy problems of TCP Fast Open
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Hi everyone,

TCP Fast Open has significant privacy problems which are not considered
in RFC 7413.
For example, this protocol allows a passive network observer to
correlate connections established by the same client, which protocols
such as TLS 1.3 and QUIC actively protect against. Furthermore, Fast
Open cookies present a kernel-based tracking mechanism which is quite
persistent. Amongst others, they can be used to conduct cross-browser
tracking on the same operating system.
For further details please refer to this article:
https://arxiv.org/pdf/1905.03518.pdf

I suggest, that the working group takes steps to highlight these privacy
problems of RFC 7413.

Regards,
Erik

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