Protecting encrypted cookies from compression side-channel attacks

Alawatugoda, Janaka, Stebila, Douglas, & Boyd, Colin (2015) Protecting encrypted cookies from compression side-channel attacks. In Financial Cryptography and Data Security: 19th International Conference, FC 2015, Revised Selected Papers [Lecture Notes in Computer Science, Volume 8975], Sprinegr, San Juan, Puerto Rico, The United States of America, pp. 86-106.

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Compression is desirable for network applications as it saves bandwidth; however, when data is compressed before being encrypted, the amount of compression leaks information about the amount of redundancy in the plaintext. This side channel has led to successful CRIME and BREACH attacks on web traffic protected by the Transport Layer Security (TLS) protocol. The general guidance in light of these attacks has been to disable compression, preserving confidentiality but sacrificing bandwidth. In this paper, we examine two techniques - heuristic separation of secrets and fixed-dictionary compression|for enabling compression while protecting high-value secrets, such as cookies, from attack. We model the security offered by these techniques and report on the amount of compressibility that they can achieve.

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ID Code: 80079
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
DOI: 10.1007/978-3-662-47854-7_6
ISBN: 978-3-662-47853-0
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 [please consult the authors]
Deposited On: 15 Jan 2015 01:50
Last Modified: 09 Sep 2015 03:58

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