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Extracting and verifying cryptographic models from C protocol code by symbolic execution

: Aizatulin, M.; Gordon, A.D.; Jürjens, J.


Chen, Y. ; Association for Computing Machinery -ACM-, Special Interest Group on Security, Audit and Control -SIGSAC-:
CCS 2011, 18th ACM Conference on Computer and Communications Security. Proceedings : Oct 17-21, 2011, Chicago, IL, USA
New York: ACM, 2011
ISBN: 978-1-4503-1075-8
ISBN: 978-1-4503-0948-6
Conference on Computer and Communications Security (CCS) <18, 2011, Chicago/Ill.>
Conference Paper
Fraunhofer ISST ()

Consider the problem of verifying security properties of a cryptographic protocol coded in C. We propose an automatic solution that needs neither a pre-existing protocol description nor manual annotation of source code. First, symbolically execute the C program to obtain symbolic descriptions for the network messages sent by the protocol. Second, apply algebraic rewriting to obtain a process calculus description. Third, run an existing protocol analyser (ProVerif) to prove security properties or find attacks. We formalise our algorithm and appeal to existing results for ProVerif to establish computational soundness under suitable circumstances. We analyse only a single execution path, so our results are limited to protocols with no significant branching. The results in this paper provide the first computationally sound verification of weak secrecy and authentication for (single execution paths of) C code.