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2017 | OriginalPaper | Buchkapitel

Forward-Secure Searchable Encryption on Labeled Bipartite Graphs

verfasst von : Russell W. F. Lai, Sherman S. M. Chow

Erschienen in: Applied Cryptography and Network Security

Verlag: Springer International Publishing

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Abstract

Forward privacy is a trending security notion of dynamic searchable symmetric encryption (DSSE). It guarantees the privacy of newly added data against the server who has knowledge of previous queries. The notion was very recently formalized by Bost (CCS ’16) independently, yet the definition given is imprecise to capture how forward secure a scheme is. We further the study of forward privacy by proposing a generalized definition parametrized by a set of updates and restrictions on them. We then construct two forward private DSSE schemes over labeled bipartite graphs, as a generalization of those supporting keyword search over text files. The first is a generic construction from any DSSE, and the other is a concrete construction from scratch. For the latter, we designed a novel data structure called cascaded triangles, in which traversals can be performed in parallel while updates only affect the local regions around the updated nodes. Besides neighbor queries, our schemes support flexible edge additions and intelligent node deletions: The server can delete all edges connected to a given node, without having the client specify all the edges.

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Vorheriges Kapitel Lattice-Based DAPS and Generalizations: Self-enforcement in Signature Schemes

Nächstes Kapitel Bounds in Various Generalized Settings of the Discrete Logarithm Problem

A few exceptions include Lai-Chow [13] and a modified version of the one by Kamara et al. [11]. However, these schemes leak substantial information during updates.

While the design of cascaded triangles is original, we do not rule out the possibility that there are similar data structures outside the literature of SSE. To the best of our knowledge, we are unaware of any common similar data structure. There are false relatives such as fractional cascading which solves totally different problems.

Candidate base schemes include [13] and a modified version of [11].

We can drop the restriction \(w_0 = w_1\) by simply encrypting w during additions.

For example, a ciphertext for message m with randomness r can be computed as \(c = (r, {\mathsf {PRF}}(K,r) \oplus m)\), where \({\mathsf {PRF}}\), modeling a random oracle, is a pseudorandom function with secret key K. In practice, one may substitute \({\mathsf {PRF}}\) with an HMAC.

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Bost, R.: \(\sum \)o\(\varphi \)o\(\varsigma \): forward secure searchable encryption. In: Proceedings of the 2016 ACM SIGSAC Conference on Computer and Communications Security, Vienna, Austria, 24–28 October 2016, pp. 1143–1154 (2016)

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Chen, Y.-C., Chow, S.S.M., Chung, K.-M., Lai, R.W.F., Lin, W.-K., Zhou, H.-S.: Cryptography for parallel RAM from indistinguishability obfuscation. In: Sudan, M. (ed.) ITCS 2016, Cambridge, MA, USA, 14–16 January 2016, pp. 179–190. ACM (2016)

Curtmola, R., Garay, J.A., Kamara, S., Ostrovsky, R.: Searchable symmetric encryption: improved definitions and efficient constructions. In: Juels, A., Wright, R.N., Sabrina De Capitani di Vimercati, (eds.) ACM CCS 2006, Alexandria, Virginia, USA, 30 October–3 November 2006, pp. 79–88. ACM Press (2006)

Curtmola, R., Garay, J.A., Kamara, S., Ostrovsky, R.: Searchable symmetric encryption: Improved definitions and efficient constructions. J. Comput. Secur. 19(5), 895–934 (2011)CrossRef

Garg, S., Mohassel, P., Papamanthou, C.: TWORAM: efficient oblivious RAM in two rounds with applications to searchable encryption. In: Robshaw, M., Katz, J. (eds.) CRYPTO 2016. LNCS, vol. 9816, pp. 563–592. Springer, Heidelberg (2016). doi:10.1007/978-3-662-53015-3_20 CrossRef

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Kamara, S., Papamanthou, C., Roeder, T.: Dynamic searchable symmetric encryption. In: Yu, T., Danezis, G., Gligor, V.D. (eds.) ACM CCS 2012, Raleigh, NC, USA, 16–18 October 2012, pp. 965–976. ACM Press (2012)

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Lai, R.W.F., Chow, S.S.M.: Structured encryption with non-interactive updates and parallel traversal. In: 35th IEEE International Conference on Distributed Computing Systems, ICDCS 2015, Columbus, OH, USA, 29 June–2 July 2015, pp. 776–777 (2015)

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Lai, R.W.F., Chow, S.S.M.: Parallel and dynamic structured encryption. In: SECURECOMM 2016 (2016, to appear)

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Titel: Forward-Secure Searchable Encryption on Labeled Bipartite Graphs
verfasst von: Russell W. F. Lai
Sherman S. M. Chow
Verlag: Springer International Publishing
Buch: Applied Cryptography and Network Security
Print ISBN: 978-3-319-61203-4

Electronic ISBN: 978-3-319-61204-1

Copyright-Jahr: 2017
DOI: https://doi.org/10.1007/978-3-319-61204-1_24

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