Computer Security – ESORICS 2013: 18th European Symposium on by Ivan Damgård, Marcel Keller, Enrique Larraia, Valerio

By Ivan Damgård, Marcel Keller, Enrique Larraia, Valerio Pastro, Peter Scholl (auth.), Jason Crampton, Sushil Jajodia, Keith Mayes (eds.)

This e-book constitutes the refereed complaints of the 18th ecu Symposium on machine safety, ESORICS 2013, held in Egham, united kingdom, in September 2013.

The forty three papers incorporated within the ebook have been rigorously reviewed and chosen from 242 papers. the purpose of ESORICS is to extra the growth of study in desktop defense by means of setting up a eu discussion board for bringing jointly researchers during this quarter, by means of selling the trade of principles with approach builders and by way of encouraging hyperlinks with researchers in similar parts. The papers hide all subject matters with regards to protection, privateness and belief in desktops and networks.

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Extra info for Computer Security – ESORICS 2013: 18th European Symposium on Research in Computer Security, Egham, UK, September 9-13, 2013. Proceedings

Sample text

This scheme is semantically secure if Paillier’s Decision Composite Residuosity Assumption [35] holds. 5 Mixed Trapdoor Commitment Scheme We now construct a commitment scheme which we will use instead of traditional UC commitment schemes [9] in our circuit evaluation protocol. 1 To the best of our knowledge, this is a novel scheme. We define a mixed trapdoor commitment scheme to be a commitment scheme that is either: perfectly hiding and equivocable; or statistically binding, depending on the distribution of the CRS.

Additionally, P sends an empty message to Q to ensure that both parties agree on the shared input ϕ. See Figure 3. Multiplication. In this instruction, the product of two values in the circuit is computed: V [k0 ] ← V [k1 ] · V [k2 ]. We can rewrite this as: SP [k0 ] + SQ [k0 ] ← SP [k1 ]·SP [k2 ] + SP [k1 ]·SQ [k2 ] + SQ [k1 ]·SP [k2 ] + SQ [k1 ]·SQ [k2 ] pˆ (˜ u+˜ v) (u+v) qˆ where we introduce pˆ, qˆ, u˜, v˜, u, v to simplify the discussion. The idea of this protocol is for P and Q to compute pˆ and qˆ, respectively, using their private shares.

1 Realizing ΠABB P and Q each maintain the following global state: several associative arrays mapping the identifier of a value in the circuit (in Σ ) to a variety of cryptographic objects: SP and SQ map to the shares of P and Q of the values in the circuit (in Zn ), respectively; CP and CQ map to the commitment of the corresponding shares; XP (maintained by P only) and XQ (Q only) map to the opening of the commitments. For the Proof functionality, both parties maintain lists of identifiers corresponding to values that are known to P and Q: KP and KQ , respectively.

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