A publicly verifiable secret sharing (PVSS) scheme, proposed by Stadler in [Sta96], is a VSS scheme in which anyone, not only the shareholders, can verify that the secret shares are correctly distributed. PVSS can play essential roles in the systems using VSS. Achieving simultaneously the following two features for PVSS is a challenging job: – Efficient non-interactive public verification. – Pr...

Secret sharing schemes protect secrecy and integrity of information by dividing it into shares and distributing these shares among different locations. In k + 1 out of n threshold schemes, security is assured if throughout the entire life-time of the secret the adversary compromises no more than k of the n locations. For long-lived and sensitive secrets this protection may be insufficient. We p...

This chapter focuses on the tensions from two opposite forces: the need for formalization (static knowledge) on the one hand and the tacit understanding that implies creativity and innovation (dynamic knowledge) on the other. In order to explore these concepts, the means of overcoming this confrontation are analyzed – in other words the “knowledge vision” of management, the knowledge culture(s)...

When a client uses the service which is offered by cloud storage providers, he might worry about how to retrieve their original files securely. Relieving client’s storage burden and successfully retrieving data on demand are the ultimate purposes of cloud storage service. To achieve the above two aims, in this paper we propose a specific way to store and retrieve the out stored data in cloud st...