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See detailBreaking Unlinkability of the ICAO 9303 Standard for e-Passports using Bisimilarity
Horne, Ross James UL; Mauw, Sjouke UL; Smith, Zachary Daniel UL et al

in Breaking Unlinkability of the ICAO 9303 Standard for e-Passports using Bisimilarity (2019, September 23)

We clear up confusion surrounding privacy claims about the ICAO 9303 standard for e-passports. The ICAO 9303 standard includes a Basic Access Control (BAC) protocol that should protect the user from being ... [more ▼]

We clear up confusion surrounding privacy claims about the ICAO 9303 standard for e-passports. The ICAO 9303 standard includes a Basic Access Control (BAC) protocol that should protect the user from being traced from one session to another. While it is well known that there are attacks on BAC, allowing an attacker to link multiple uses of the same passport, due to differences in implementation; there still remains confusion about whether there is an attack on unlinkability directly on the BAC protocol as specified in the ICAO 9303 standard. This paper clarifies the nature of the debate, and sources of potential confusion. We demonstrate that the original privacy claims made are flawed, by uncovering attacks on a strong formulation of unlinkability. We explain why the use of the bisimilarity equivalence technique is essential for uncovering our attacks. We also clarify what assumptions lead to proofs of formulations of unlinkability using weaker notions of equivalence. Furthermore, we propose a fix for BAC within the scope of the standard, and prove that it is correct, again using a state-of-the-art approach to bisimilarity. [less ▲]

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See detailDe Morgan Dual Nominal Quantifiers Modelling Private Names in Non-Commutative Logic
Horne, Ross James UL; Tiu, Alwen; Aman, Bogdan et al

in ACM Transactions on Computational Logic (2019), 20(4), 221--2244

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See detailGlobal Types with Internal Delegation
Castellani, Ilaria; Dezani-Ciancaglini, Mariangiola; Giannini, Paola et al

in Theoretical Computer Science (2019)

This paper investigates a new form of delegation for multiparty session calculi. Usually, delegation allows a session participant to appoint a participant in another session to act on her behalf. This ... [more ▼]

This paper investigates a new form of delegation for multiparty session calculi. Usually, delegation allows a session participant to appoint a participant in another session to act on her behalf. This means that delegation is inherently an inter-session mechanism, which requires session interleaving. Hence delegation falls outside the descriptive power of global types, which specify single sessions. As a consequence, properties such as deadlock-freedom or lock-freedom are difficult to ensure in the presence of delegation. Here we adopt a different view of delegation, by allowing participants to delegate tasks to each other within the same multiparty session. This way, delegation occurs within a single session (internal delegation) and may be captured by its global type. To increase flexibility in the use of delegation, our calculus uses connecting communications, which allow optional participants in the branches of choices. By these means, we are able to express conditional delegation. We present a session type system based on global types with internal delegation, and show that it ensures the usual safety properties of multiparty sessions, together with a progress property. [less ▲]

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See detailThe Sub-Additives: A Proof Theory for Probabilistic Choice extending Linear Logic
Horne, Ross James UL

in 4th International Conference on Formal Structures for Computation and Deduction (FSCD 2019). (2019)

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See detailGraphical Models for Security - 6th International Workshop, Revised Papers
Albanese, Massimiliano; Horne, Ross James UL; Probst, Christian W.

Scientific Conference (2019)

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See detailConstructing weak simulations from linear implications for processes with private names
Horne, Ross James UL; Tiu, Alwen

in Mathematical Structures in Computer Science (2019)

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See detailThe Attacker Does not Always Hold the Initiative: Attack Trees with External Refinement
Horne, Ross James UL; Mauw, Sjouke UL; Tiu, Alwen

in Proc.\ 5th International Workshop on Graphical Models for Security (GraMSec'18) (2018, July 08)

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See detailQuasi-Open Bisimilarity with Mismatch is Intuitionistic
Horne, Ross James UL; Ahn, Ki Yung; Lin, Shang-wei et al

in Proceedings of LICS '18: 33rd Annual ACM/IEEE Symposium on Logic in Computer Science, Oxford, United Kingdom, July 9-12, 2018 (LICS '18) (2018)

Quasi-open bisimilarity is the coarsest notion of bisimilarity for the π-calculus that is also a congruence. This work extends quasi-open bisimilarity to handle mismatch (guards with inequalities). This ... [more ▼]

Quasi-open bisimilarity is the coarsest notion of bisimilarity for the π-calculus that is also a congruence. This work extends quasi-open bisimilarity to handle mismatch (guards with inequalities). This minimal extension of quasi-open bisimilarity allows fresh names to be manufactured to provide constructive evidence that an inequality holds. The extension of quasi-open bisimilarity is canonical and robust --- coinciding with open barbed bisimilarity (an objective notion of bisimilarity congruence) and characterised by an intuitionistic variant of an established modal logic. The more famous open bisimilarity is also considered, for which the coarsest extension for handling mismatch is identified. Applications to checking privacy properties are highlighted. Examples and soundness results are mechanised using the proof assistant Abella. [less ▲]

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See detailSemantics for specialising attack trees based on linear logic
Horne, Ross James UL; Mauw, Sjouke UL; Tiu, Alwen

in Fundamenta Informaticae (2017), 153(1-2), 57-86

Attack trees profile the sub-goals of the proponent of an attack. Attack trees have a variety of semantics depending on the kind of question posed about the attack, where questions are captured by an ... [more ▼]

Attack trees profile the sub-goals of the proponent of an attack. Attack trees have a variety of semantics depending on the kind of question posed about the attack, where questions are captured by an attribute domain. We observe that one of the most general semantics for attack trees, the multiset semantics, coincides with a semantics expressed using linear logic propositions. The semantics can be used to compare attack trees to determine whether one attack tree is a specialisation of another attack tree. Building on these observations, we propose two new semantics for an extension of attack trees named causal attack trees. Such attack trees are extended with an operator capturing the causal order of sub-goals in an attack. These two semantics extend the multiset semantics to sets of series-parallel graphs closed under certain graph homomorphisms, where each semantics respects a class of attribute domains. We define a sound logical system with respect to each of these semantics, by using a recently introduced extension of linear logic, called MAV , featuring a non-commutative operator. The non-commutative operator models causal dependencies in causal attack trees. Similarly to linear logic for attack trees, implication defines a decidable preorder for specialising causal attack trees that soundly respects a class of attribute domains. [less ▲]

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See detailA Characterisation of Open Bisimilarity using an Intuitionistic Modal Logic
Ahn, Ki Yung; Horne, Ross James UL; Tiu, Alwen

in 28th International Conference on Concurrency Theory (CONCUR 2017). (2017)

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See detailPrivate Names in Non-Commutative Logic
Horne, Ross James UL; Tiu, Alwen; Aman, Bogdan et al

in 27th International Conference on Concurrency Theory (CONCUR 2016) (2016)

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See detailA descriptive type foundation for RDF Schema
Ciobanu, Gabriel; Horne, Ross James UL; Sassone, Vladimiro

in Journal of Logical and Algebraic Methods in Programming (2016), 85(5), 681-706

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See detailSPEC: An Equivalence Checker for Security Protocols
Tiu, Alwen; Nguyen, Nam; Horne, Ross James UL

in Programming Languages and Systems - 14th Asian Symposium, APLAS 2016, Hanoi, Vietnam, November 21-23, 2016, Proceedings (2016)

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See detailMinimal type inference for Linked Data consumers
Ciobanu, Gabriel; Horne, Ross James UL; Sassone, Vladimiro

in Journal of Logical and Algebraic Methods in Programming (2015), 84(4), 485-504

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See detailThe consistency and complexity of multiplicative additive system virtual
Horne, Ross James UL

in Scientific Annals of Computer Science (2015), 25(2), 245-316

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See detailBehavioural analysis of sessions using the calculus of structures
Ciobanu, Gabriel; Horne, Ross James UL

in In Perspectives of System Informatics, 10th International Andrei Ershov Informatics Conference, PSI 2015, in Memory of Helmut Veith, Kazan and Innopolis, Russia, August 24-27 (2015)

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See detailA verified algebra for read-write Linked Data
Horne, Ross James UL; Sassone, Vladimiro

in Science of Computer Programming (2014), 89

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See detailNon-interleaving Operational Semantics for Geographically Replicated Databases
Ciobanu, Gabriel; Horne, Ross James UL

in 15th International Symposium on Symbolic and Numeric Algorithms for Scientific Computing, {SYNASC} 2013, Timisoara, Romania, September 23-26, 2013 (2013)

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See detailTracing where and who provenance in Linked Data: A calculus
Dezani-Ciancaglini, Mariangiola; Horne, Ross James UL; Sassone, Vladimiro

in Theoretical Computer Science (2012), 464

Detailed reference viewed: 60 (1 UL)