Count-min sketches for estimating password frequency within Hamming distance two

South, Leah & Stebila, Douglas (2013) Count-min sketches for estimating password frequency within Hamming distance two. Lecture Notes in Computer Science [Information Security and Privacy: 18th Australasian Conference, ACISP 2013, Brisbane, Australia, July 1-3, 2013 Proceedings], 7959, pp. 388-402.

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Abstract

The count-min sketch is a useful data structure for recording and estimating the frequency of string occurrences, such as passwords, in sub-linear space with high accuracy. However, it cannot be used to draw conclusions on groups of strings that are similar, for example close in Hamming distance. This paper introduces a variant of the count-min sketch which allows for estimating counts within a specified Hamming distance of the queried string. This variant can be used to prevent users from choosing popular passwords, like the original sketch, but it also allows for a more efficient method of analysing password statistics.

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ID Code: 62027
Item Type: Journal Article
Refereed: Yes
Additional Information: Proceedings of the 18th Australasian Conference on Information Security and Privacy (ACISP 2013)
Keywords: count-min sketch, Bloom filter, password frequency, approximate string matching
DOI: 10.1007/978-3-642-39059-3_27
ISBN: 9783642390593
ISSN: 1611-3349
Subjects: Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > COMPUTATION THEORY AND MATHEMATICS (080200) > Analysis of Algorithms and Complexity (080201)
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 2013 Springer
Copyright Statement:

This is the author-version of the work.

Conference proceedings published, by Springer Verlag, will be available via http://www.springer.de/comp/lncs/

Deposited On: 25 Aug 2013 23:15
Last Modified: 06 Sep 2014 01:48

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