Abstract-Cloud computing is used to share computing resources and data over internet.When sensitive data is shared over Internet, it should be transferred in secured manner. Data security is ensured using Identity Based Encryption mechanism. In the existing Cloud Computing system which is implemented using Identity Based Encryption mechanism, authorized user can share their credential to unauthorized user and data can be accessed by unauthorized user who hasn't subscribed to Cloud Computing System. To overcome this issue, we propose a notion called Extended Identity Based Encryption(E-IBE) system, which ensures authentication and confidentiality. In this approach, we use Kerberos authentication protocol along with Identity Based Encryption methodology to ensure authentication and confidentiality.
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