Formal Specification for Online Food Ordering System Using Z Language

An Object-Z Specification of a Petrol Supply System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.427-429.2349 ◽

2013 ◽

Vol 427-429 ◽

pp. 2349-2353

Author(s):

Yang Ping Li ◽

Wei Quan Zhao ◽

Xiao Rui Wei

Keyword(s):

Complex Systems ◽

Formal Methods ◽

Formal Specification ◽

Object Oriented ◽

Supply System ◽

Data Intensive ◽

Z Language ◽

Complex Computer ◽

Formal Specification Language

As modern complex computer systems become increasingly sophisticated and data-intensive, people have long recognized the importance of precisely and unambiguously specifying them with formal methods. This paper advocates the use of Object-Z, a formal specification language, in the description of complex systems. Object-Z is an extension to the Z language to facilitate specification in an object-oriented style. First, we informally describe the syntax and semantics of Object-Z, highlighting those features that facilitate decomposing a large system into a collection of underlying objects and thus separating concerns. Then, we demonstrate the use of Object-Z by presenting a case study of a petrol supply system, illustrating how the system runs by communicating the constituent objects. Finally, we discuss several issues we encountered in this exercise, which may serve as feedback to the development of Object-Z.

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A Verified Formal Specification of A Secured Communication Method For Smart Card Applications

Academic Society for Appropriate Technology ◽

10.37675/jat.2021.7.2.172 ◽

2021 ◽

Vol 7 (2) ◽

pp. 172-187

Author(s):

Donald D. Kim

Keyword(s):

Formal Specification ◽

Secure Communication ◽

Security Policy ◽

Security Breaches ◽

Business Applications ◽

Communication Method ◽

High Assurance ◽

Z Language ◽

Embedded Operating Systems ◽

Secured Communication

In remote villages without access to modern IT technology, simple devices such as smartcards can be used to carry out business transactions. These devices typically store multiple business applications from multiple vendors. Although devices must prevent malicious or accidental security breaches among the applications, a secure communication channel between two applications from different vendors is often required. In this paper, first, we propose a method of establishing secure communication channels between applications in embedded operating systems that run on multi-applet smart cards. Second, we enforce the high assurance using an intransitive noninterference security policy. Thirdly, we formalize the method through the Z language and create the formal specification of the proposed secure system. Finally, we verify its correctness using Rushby's unwinding theorem.

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