By Gilles Barthe, Benjamin Grégoire, Santiago Zanella Béguelin (auth.), Jeremy Gibbons, Pablo Nogueira (eds.)
This ebook constitutes the refereed complaints of the eleventh overseas convention on arithmetic of application development, MPC 2012, held in Madrid, Spain, in June 2012. The thirteen revised complete papers offered including 3 invited talks have been rigorously reviewed and chosen from 27 submissions. The papers are prepared in topical sections on safeguard and data circulate, synchronous and real-time platforms, algorithms and video games, software calculi, instrument help, algebras and datatypes, and specific practical programming.
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Extra resources for Mathematics of Program Construction: 11th International Conference, MPC 2012, Madrid, Spain, June 25-27, 2012. Proceedings
Scheduler-Independent Declassiﬁcation 4 39 Secure Declassification for Multi-threaded Programs When developing a multi-threaded program, usually a speciﬁcation of the scheduler’s interface is available, but the concrete scheduler is not known. , for setting scheduling priorities). However, the scheduler should not have direct access to secrets via the interface because the scheduling of threads might have an eﬀect on the probability of an attacker’s observations. Hence, one should treat all elements of the scheduler’s interface like public sinks in a security analysis.
Let d ∈ D be a security domain and H ⊆ D × E be a set of escape hatches. An s-speciﬁc strong (d , H )-bisimulation is a per Rd,H ⊆ C ∗ × C ∗ that fulﬁlls the following two conditions: 1. ∀(cnf , cnf ) ∈ R↑d,H . ∀Cls ∈ classes(R↑d,H ). prob s (cnf , Cls) = prob s (cnf , Cls) 2. the property λcnf ∈ Cnf . (cnf ∈ classes(R↑d,H )) is an invariant under s. Condition 1 in Deﬁnition 10 ensures that if a single computation step is performed in two related conﬁgurations cnf and cnf under a scheduler s then each 1 By increasing the number of runs such inferences are possible with high conﬁdence, even if the diﬀerence between observed frequency and expected frequency is small.
Running P2 with two memories that diﬀer in h deterministically results in two diﬀerent thread pools, namely in l:=3 0, l:=4 1 and l:=6 1,l:=7 0 . These two thread pools must be related by Rlow,lH ,PP according to Condition 2 in Deﬁnition 15. However, the probability of moving from these two conﬁgurations into the same equivalence class diﬀers as our biased scheduler chooses the ﬁrst thread with a higher probability than the second. Therefore, Condition 2 is violated by / WHAT&WHEREs . ♦ the second computation step and, hence, P2 ∈ Example 3.
Mathematics of Program Construction: 11th International Conference, MPC 2012, Madrid, Spain, June 25-27, 2012. Proceedings by Gilles Barthe, Benjamin Grégoire, Santiago Zanella Béguelin (auth.), Jeremy Gibbons, Pablo Nogueira (eds.)