cake shop game online - Better Online Games

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Therefore, if there are d data items with H groups in each, then there will be dH group keys in the broadcast. cake shop game online - In DG, since all subscribers in the same group will be dropped at the same time, it is never necessary to issue a new group key and distribute it to the group. cake shop game online - The client needs to contact the SServ but has no interaction with the BServ except for listening to the broadcast. cake shop game online - In DG, client keys are used for communicating with the Subscription Server. At the end of each subscription epoch, d groups will be dropped, and d groups will be added, one group per each data item. cake shop game online - Authentication, subscription and the initial key exchange are performed using public and private keys. cake shop game online - Note that real-world analogies exist for this scenario: readers may subscribe to journals between 1 and 24 months and receive issues monthly. cake shop game online - 5 DROP GROUPS ARCHITECTURE In this environment, there are two separate servers, the Subscription Server (SServ) and the Broadcast Server (BServ). The server can adjust the duration of an epoch depending on the popularity or subscription patterns of the clients of an item. cake shop game online - Once the client contacts the SServ, it communicates the request to the BServ, which incorporates the requested data item in the broadcast. cake shop game online - The two servers need to maintain communication between each other mainly for exchanging information specific to data items. This is designed to remedy a major problem associated with the group key approach, namely, the key expiration problem in a dynamic environment. cake shop game online - When a client wishes to access the service, it first contacts the SServ that handles the subscription requests. Clearly, this is a big step towards limiting the size of the broadcast, thus satisfying the scalability requirement. cake shop game online - For example, if the epoch length is 1 hour, and client A wants to subscribe to a data item for 2. cake shop game online - Although key generation is rather fast and cheap, it is costly to distribute this new key to the clients. cake shop game online - In this environment, the period of validity of a key is small, necessitating the generation of a new key frequently. cake shop game online - Furthermore, when a new client contacts the subscription server, the client is given a group key for each data item that it is interested in. The time continuum is divided into subscription epochs such that subscription expirations are only scheduled to happen at the end of an epoch. Essentially, this bounds the number of groups. 5 hours, it must choose to subscribe for either two or three hours. cake shop game online - Given such a framework, given a subscription horizon of H epochs, in the key component, there can be at most H group keys preceding the data item regardless of the number of subscribers in each group. cake shop game online - For example, if a subscription epoch is one hour long, and the horizon is 24 hours, then there are 24 possible subscription epochs that clients may choose from. cake shop game online - The client then listens to the broadcast prepared by the subscription server and downloads the data items. After exchanging information with the SServ, the client listens to the broadcast prepared by the BServ until its subscription expires cake shop game online. cake shop game online - To limit the number of epochs, a limit is set on the horizon of subscription.