Some cryptographic protocols are vulnerable to replay attacks, a type of weakness that was a focus of attention in the Burroughs-Abadi-Needham logic. Newer, more operational approaches to protocol analysis have not concentrated on this type of attack. This paper fills the gap for the strand space theory. The main technical point is to provide a definition of recency. Our candidate is convenient...

Formal study of aspect-oriented languages is difficult because current theoretical models provide a range of features that is too limited and rely on encodings using lower-level abstractions, which involve a cumbersome level of indirection. We present a calculus, based on Abadi and Cardelli’s object calculus, that explicitly models a base language and a variety of point cut description language...

Step-indexed semantic models of types were proposed as an alternative to purely syntactic proofs of type safety using subject reduction. Building on work by Ahmed, Appel and others, we introduce a step-indexed model for the imperative object calculus of Abadi and Cardelli. Providing a semantic account of this calculus using more ‘traditional’, domain-theoretic approaches has proved challenging ...

The main contribution of this paper is a formal characterization of recursive object specifications and their existence based on a denotational untyped semantics of the object calculus. Existence is not guaranteed but can be shown employing Pitts’ results on relational properties of domains. The semantics can be used to analyse and verify Abadi & Leino’s object logic but it also suggests extens...

Abstrak
 
 PT. Putra Perkasa Abadi (PPA) merupakan kontraktor pertambangan dengan spesialisasi alat berat penyedia jasa persewaan peralatan, pemindahan tanah & pertambangan.Terdapat beberapa permasalahan yang sering terjadi dalam penambangan antara lain kerusakan prematur pada vessel, durasi dumping lama, carryback material, dan high risk aktivitas dumping. Melekatnya material di ...

We propose an interpretation of a typed concurrent calculus of objects based on the imperative object calculus of Abadi and Cardelli. The target of our interpretation is a version of the blue calculus, a variant of the π-calculus that directly contains functions, with record and firstorder types. We show that reductions and type judgments are derivable in a rather simple and natural way, and th...

The secure deployment of components is widely recognized as a crucial problem in component-based software engineering. While major effort is concentrated on preventing malicious components from penetrating secure systems, other security violations may also cause significant problems. We uncover a technique that creates a major breach of security by allowing rogue components to interfere with co...