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Paper Details

%T A Circus Development and Verification of an Internet Packet Filter.
%A Alistair A. McEwan
%E Peter H. Welch, Jon Kerridge, Frederick R. M. Barnes
%B Communicating Process Architectures 2006
%X In this paper, we present the results of a significant and
   large case study in Circus. Development is top\-down \- from
   a sequential abstract specification about which safety
   properties can be verified, to a highly concurrent
   implementation on a Field Programmable Gate Array.
   Development steps involve applying laws of Circus allowing
   for the refinement of specifications; confidence in the
   correctness of the development is achieved through the
   applicability of the laws applied; proof obligations are
   discharged using the model\-checker for CSP, FDR, and the
   theorem prover for Z, Z/Eves. An interesting feature of this
   case study is that the design of the implementation is
   guided by domain knowledge of the application \- the
   application of this domain knowledge is supported by, rather
   than constrained by the calculus. The design is not what
   would have been expected had the calculus been applied
   without this domain knowledge. Verification highlights a
   curious error made in early versions of the implementation
   that were not detected by testing.

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