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The SPEKE Protocol Revisited

Lookup NU author(s): Professor Feng Hao, Dr Siamak Fayyaz Shahandashti


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The SPEKE protocol is commonly considered one of the classic Password Authenticated Key Exchange (PAKE) schemes. It has been included in international standards (particularly, ISO/IEC 11770-4 and IEEE 1363.2) and deployed in commercial products (e.g., Blackberry). We observe that the original SPEKE specification is subtly different from those defined in the ISO/IEC 11770-4 and IEEE 1363.2 standards. We show that those differences have critical security implications by presenting two new attacks on SPEKE: an impersonation attack and a keymalleability attack. The first attack allows an attacker to impersonate a user without knowing the password by engaging in two parallel sessions with the victim. The second attack allows an attacker to manipulate the session key established between two honest users without being detected. Both attacks are applicable to the original SPEKE scheme, and are only partially addressed in the ISO/IEC 11770-4 and IEEE 1363.2 standards. We highlight deficiencies in both standards and suggest concrete changes.

Publication metadata

Author(s): Hao F, Shahandashti SF

Editor(s): Liqun Chen, Chris Mitchell

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: First International Conference on Security Standardisation Research (SSR 2014)

Year of Conference: 2014

Pages: 26-38

Online publication date: 16/12/2014

Acceptance date: 01/01/1900

ISSN: 0302-9743

Publisher: Springer


DOI: 10.1007/978-3-319-14054-4_2

Library holdings: Search Newcastle University Library for this item

Series Title: Lecture Notes in Computer Science

ISBN: 9783319140537