Tryst: The Case for Confidential
Service Discovery Jeffrey Pang
(CMU), Ben Greenstein (Intel Research
Seattle), Srinivasan Seshan
(CMU), and David Wetherall (Intel
Research Seattle, University of
Summary: Today Service Discovery is done in unsecure and
it has uses because it makes it easy. However it divulges
information that you
may not want to reveal. You will announce identity, and
information that can
others can use for exploits, which leads to keeping of history which
correlated with location. Finally SD today is unauthenticated.
Jeff also described the challenges in design of Tryst; in particular,
Key exchange, and establishment and trust. And how Tyrst solves
Q & A:
Q: The symmetric keys in your system are pair-wise, would that
require many exchanges.
A: Overhead might be reasonable because many devices do not have so
Q: Just looking at the side information can reveal information.
A: Yes there are plenty of other channels that can reveal
information, for example, timing and size of messages, or physical
proximity that can reveal information.