Abstract
The cloud computing is considered as the next-generation of IT technology that can provide various elastic and scalable IT services in pay-as-you-go. This technology has been used by worldwide companies to improve their business performance. Therefore, authentication of both clients and services is a significant issue for the trust and security of the cloud computing. At present, to protect the security of the cloud, many ideas have been proposed. In this paper, we present DSA protocol concentrated on authentication of clients. It is an improved protocol based on Kerberos, which prevents password guessing attack by using dynamic session key. We also solved the problem of service availability by introducing two additional messages in the scheme.
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