We extend the Abadi-Cardelli calculus of primitive objects with object extension. We enrich object types with a more precise, uniform, and exible type structure. This enables to type object extension under both width and depth subtyping. Objects may also have extend-only or virtual contra-variant methods and read-only co-variant methods. The resulting subtyping relation is richer, and types of ...

Formal specification language and deduction system for object-oriented models is proposed in this article. It extends ς-calculus introduced by Martín Abadi and Luca Cardelli with propositional connectives, and quantified terms. The first-order type system of ς-calculus serves as typing theory of suggested calculus. Deduction system consists of reduction rules of ς-terms, equality theory of ς-ca...

We formalize Abadi and Rogaway's computational soundness result in the Coq interactive theorem prover. This requires to model notions of provable cryptography like indistinguishability between ensembles of probability distributions, PPT reductions, and security notions for encryption schemes. Our formalization is the rst computational soundness result to be mechanized, and it shows the feasibil...

This paper provides one more step towards bridging the gap between the formal and computational approaches to the verification of cryptographic protocols. We extend the well-known Abadi-Rogaway logic with probabilistic hashes and give a precise semantic interpretation to it using Canetti’s oracle hashes. These are probabilistic polynomialtime hashes that hide all partial information. Finally, w...

In the ECOOP’97 conference, the author of the present paper investigated a conservative extension, called Ob+1<:, of the first-order Object Calculus Ob1<: of Abadi and Cardelli, supporting method extension in presence of object subsumption. In this paper, we extend that work with explicit variance annotations and selftypes. The resulting calculus, called Ob+s<:, is a proper extension of Ob+1<:....

In the past few years a lot of attention has been paid to the use of special logics to analyae cryptographic protocols, foremost among these being the logic of Burrows, Abadi and Needham (the BAN logic). These logics have been successful in finding weaknesses in various examples. In this paper a limitation of the BAN logic is illustrated with two examples. These show that it is easy for the BAN...

In this era of interconnectedness, technological progress occurs very quickly. One technology that istrending and has been widely accepted by almost everyone around the world is e-commerce. However, in Indonesiaitself, there are still many businesses done conventionally, such as CV. Cahaya Abadi. This causesbusiness processes to not work efficiently, especially during transaction processing. An...

Ipteks for the community on CV.Agro Citra Abadi Batu with aim of helping partners in order to have a reliable accounting information systems that can provide important information, accurate and timely, so owners parties concerned analyze take right decision. Problems is not yet able evaluate his performance having system make financial statements. The purpose this activity improve understanding...