Figure 1 illustrates the idea of dimensions for the analysis of security requirements; additional dimensions will be identified and contrasted later on. The framework allows for a structured analysis of security in EBPs since a matrix can be used to illustrate the different dimensions. Security measures can be arranged in this matrix according to the security requirements. The remainder of this paper has the following structure: Section 2 discusses the dimensions of our framework. Section 3 applies the framework to a sample business scenario of a virtual shopping mall. A discussion of the results, open questions and related work follows in Section 4, before future research areas conclude this paperOur framework analyzes security using several dimensions such as security objectives, parties/places and phases of the EBP under consideration. Each of these dimensions consists of so-called elements, e.g. the dimension phase comprises four elements, and one of these elements is the negotiation phase. The purpose of this section is to describe the major dimensions of our framework and identify the elements relevant for every dimension. Please note that the framework is designed to be open, i.e. it can be adjusted through adding or removing dimensions and/or elements. In our opinion the dimensions discussed in Sections 2.1, 2.2 and 2.3 are the most important and influential ones in an e-business setting. Section 2.4 discusses further dimensions, which could be used to extend our framework
Fig1Accountability As An_decrypted
Fig. 1 Dimensions of the framework Organized in a matrix

2.1 Security Objectives

The term security objective defined in as “a processing or communication service that is provided by a system to give a specific kind of protection to system resources” or — with more emphasis on communication In — as “a service, provided by a layer of communicating open systems, which ensures adequate security of the system or of data transfer”. Therefore, security objectives are the goals that are to be achieved, while security services are means to achieve these goals. Traditionally, when talking about data security, three security objectives are addressed: confidentiality, integrity, and availability. To better suit the needs of e-business with all its legal aspects, more security objectives have been identified recently, the most important one being accountability.

Confidentiality describes the state in which data is protected from unauthorized disclosure, e.g. a loss of confidentiality occurs when the content of a communication or a file is disclosed.

Integrity means that the data has not been altered or destroyed, which can be done accidentally (e.g. transmission errors) or with malicious intent (e.g. sabotage).

Availability refers to the fact that authorized persons can access data and systems within an appropriate period of time. Reasons for loss of availability may be attacks or instabilities of the system.

Accountability: If the accountability of a system is guaranteed, the participants of a communication activity can be sure that their communication partner is the one he or she claims to be. Thus, the communication partners can be held accountable for their actions..

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