Abstract
We examine the role of session identifiers (SIDs) in security proofs for key establishment protocols. After reviewing the practical importance of SIDs we use as a case study the three-party server-based key distribution (3PKD) protocol of Bellare and Rogaway, proven secure in 1995. We show incidentally that the partnership function used in the existing security proof is flawed. There seems to be no way to define a SID for the 3PKD protocol that will preserve the proof of security. A small change to the protocol allows a natural definition for a SID and we prove that the new protocol is secure using this SID to define partnering.
This work was partially funded by the Australian Research Council Discovery Project Grant DP0345775.
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Choo, KK.R., Boyd, C., Hitchcock, Y., Maitland, G. (2005). On Session Identifiers in Provably Secure Protocols. In: Blundo, C., Cimato, S. (eds) Security in Communication Networks. SCN 2004. Lecture Notes in Computer Science, vol 3352. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-30598-9_25
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DOI: https://doi.org/10.1007/978-3-540-30598-9_25
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