A general model for MAC generation using direct injection

Bartlett, Harry, Al Mashrafi, Mufeed, Simpson, Leonie, Dawson, Edward, & Wong, Kenneth Koon-Ho (2013) A general model for MAC generation using direct injection. Lecture Notes in Computer Science [Information Security and Cryptology: 8th International Conference, Inscrypt 2012], 7763, pp. 198-215.

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Abstract

This paper presents a model for generating a MAC tag by injecting the input message directly into the internal state of a nonlinear filter generator. This model generalises a similar model for unkeyed hash functions proposed by Nakano et al. We develop a matrix representation for the accumulation phase of our model and use it to analyse the security of the model against man-in-the-middle forgery attacks based on collisions in the final register contents. The results of this analysis show that some conclusions of Nakano et al regarding the security of their model are incorrect. We also use our results to comment on several recent MAC proposals which can be considered as instances of our model and specify choices of options within the model which should prevent the type of forgery discussed here. In particular, suitable initialisation of the register and active use of a secure nonlinear filter will prevent an attacker from finding a collision in the final register contents which could result in a forged MAC.

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ID Code: 55534
Item Type: Journal Article
Refereed: Yes
Keywords: MAC, Hash functions, Stream ciphers, Forgery attacks, SSS, SOBER-128, NLSv2
DOI: 10.1007/978-3-642-38519-3_13
ISSN: 0302-9743
Subjects: Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > DATA FORMAT (080400) > Data Encryption (080402)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > Institutes > Institute for Future Environments
Current > Schools > School of Mathematical Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Please consult the authors.
Deposited On: 11 Feb 2013 04:15
Last Modified: 09 Feb 2015 17:29

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