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This paper presents a service that provides security through the technology of Web Services. The use of web services to provide security in e-learning systems will complement the features of services developed in language and/or different architectures. Thus, the work is not limited to platforms in which the client (e-learning system) was developed, since this service is provided on a flexible, scalable and configurable way. The proposed service uses public key cryptography, digital signature and secret key cryptography to provide integrity, non-repudiation, confidentiality and authenticity. The main features of the proposed service are presented in this paper, with their employability in a case study for the chat tool for collaborative learning environments, Sakai and Moodle.
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