  Guttman presented a model-theoretic approach to establishing security goals
in the context of Strand Space theory. In his approach, a run of the
Cryptographic Protocol Shapes Analyzer (CPSA) produces models that determine if
a goal is satisfied. This paper presents a method for extracting a sentence
that completely characterizes a run of CPSA. Logical deduction can then be used
to determine if a goal is satisfied. This method has been implemented and is
available to all.
