Data and Applications Security and Privacy XXVII: 27th by Sabrina De Capitani di Vimercati, Sara Foresti, Sushil

By Sabrina De Capitani di Vimercati, Sara Foresti, Sushil Jajodia, Giovanni Livraga (auth.), Lingyu Wang, Basit Shafiq (eds.)

This publication constitutes the refereed lawsuits of the twenty seventh IFIP WG 11.3 foreign convention on facts and purposes protection and privateness, DBSec 2013, held in Newark, NJ, united states in July 2013. The sixteen revised complete and six brief papers awarded have been rigorously reviewed and chosen from forty five submissions. The papers are geared up in topical sections on privateness, entry regulate, cloud computing, information outsourcing, and cellular computing.

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Additional info for Data and Applications Security and Privacy XXVII: 27th Annual IFIP WG 11.3 Conference, DBSec 2013, Newark, NJ, USA, July 15-17, 2013. Proceedings

Example text

We generated synthetic traffic data with the Brinkhoff generator [2]. The input of the generator is the road map of Oldenburg in Germany2 (Figure 3(a)),which contains 6,105 nodes and 7,035 edges, and the output is a set of moving objects on the road network. We created the data set with 100 discrete timestamps, with 500,000 objects at the beginning and 25,000 new objects introduced at every time stamp. The starting positions and destinations of the moving objects are selected randomly by the generator (see [2] for detailed network-based techniques).

24 J. Biskup and M. Preuß Moreover the functional dependency atid → {a1 , . . , ak } ∈ SCF1 is modelled in L by the singleton set fd F1 containing the sentence (∀Xtid ) (∀X1 ) . . (∀Xk ) (∀X1 ) . . (∀Xk ) [ F1 (Xtid , X1 , . . , Xk ) ∧ F1 (Xtid , X1 , . . , Xk ) ⇒ (X1 ≡ X1 ) ∧ . . ∧ (Xk ≡ Xk ) ] . (3) − Overall the logic-oriented view on f1 in L is dbf1 := db+ f1 ∪ dbf1 ∪ fd F1 . Proposition 1. Under the assumptions of Def. , Ir |=M dbf1 . Proof. Direct consequence of the definitions. An attacker is assumed to know the process of fragmentation as well as the schemas R|AR |SCR and F2 |AF2 |SCF2 of the instances kept hidden from him.

Xn ) ∧ R (Z1 , . . , Zh , Zh+1 , . . , Zk , Xk+1 , . . , Xn ) ∧ kj=1 (Yj ≡ Zj ) . (8) This view on r and f2 is referred to as the set of sentences dbR containing the sentences (4), (5), (6), (7) and (8). 26 J. Biskup and M. Preuß Strictly speaking, dbR alone does not provide any knowledge about the relational instance r; instead, only the combination of dbf1 and dbR describes the knowledge about r that is available to an attacker. The essential part of this insight is formally captured by the following proposition.

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