Abstract
Web services are considered as a powerful solution for information systems integration which is based on the service oriented architecture (SOA). Privacy is a big obstacle when using web services. Therefore, accessing web service with minimal privacy disclosure is an important challenge. Credentials encryption are used for privacy preserving. To the best of our knowledge, in the current privacy preserving approaches for web services, there is no technique that uses the credentials encryption using certificate authority as a third party. In this paper, a proposed approach for minimal privacy disclosure is proposed. This approach is based on the encryption and certificate authorities as third parties. The proposed approach is implemented and tested. The results show that the minimal privacy disclosure is achieved in the proposed approach.