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Distributed computing, grid computing, mobile computing, and pervasive computing have been dramatically advanced in recent years with a prolif eration of services and applications. However, security issues are extremely important since attacks and threats are expected, and security is still a major impediment to the further deployment of these services. Security mechanisms are essential to protect data integrity and confidentiality, access control, authentication, quality of service, userdoi:10.1201/9780849379253 fatcat:al3ffh5hnnbp7fpjoicricebgm