Rational Secret Sharing And It’s Application In Cloud Storage

In recent years, the popularity of cloud storage services has increaseddramatically, individuals and especially business hesitate to entrust their data tocloud storage services since they fear that they will lose control over it. And thisprevents cloud storage development. Secret sharing scheme has been playing a keyrole in protecting data security, including preventing an attacker to destruct andtheft the data. So research of the secret sharing scheme not only has theoreticalsignificance, but promotes the cloud storage security. This article first reviewsseveral secret sharing schemes, analyze several classic secret sharing schemes, thenanalyzes the social-rational secret sharing scheme, which is a new direction in thisfield. This scheme uses individual s sociality, which means in social life, players areinvited to each game based on their reputation. They always seek to maximize theutility, and rational secret sharing.This thesis proposes a belief-based learning model based rational secretsharing, which bridges belief learning model, game theory, cryptography andreputation systems. Compare to the social-rational secret sharing scheme, thisscheme uses belief-based learning model, which the players can form beliefs aboutthe other players action based on the history. Then the players can make decisionsdepend on different situation to maximize his utility. Analysis shows that thisscheme can incent the players to cooperate.In this article, we apply the verifiable secret sharing scheme in the distributedfile system in cloud storage system. When the client uploads his data to the system,the data is split into pieces using secret sharing scheme, and store the shares on datanodes of the data clustering, when the client downloads the data, just a specificnumber of shares are needed to reconstruct the shares, the remaining shares are usedas data fault tolerance; A reputation system is build, when the nodes sent correctsecret shares, the reputation value increases, otherwise, the reputation valuedecreases. Analysis show that the system security has improved and data storagespaces have decreased. As we only need parts of the secret shares, the read timedecreases.