We consider kleptoparasitic interactions between two individuals – the Owner and Intruder model situation as a sequential game in an extensive form. The is possession of resource when another individual, Intruder, comes along may try to steal it. If makes such stealing attempt, has decide whether defend resource; if defends, can withdraw or continue with attempt. value differently we distinguis...

Traditional approaches are inefficient to support finegrained encryption. Under such approaches, data owner is responsible for encrypting the data before uploading them into cloud and re-encrypting the data whenever there is a change in user’s sub access control policy. Data owners thus incur high communication and computation costs. In order to minimize the overhead at the data owner, fine-gra...