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In this paper we propose to employ the concept of proof of violation (POV) for the response time auditing in the cloud. A POV scheme enables a user or a service provider to produce a precise proof of either the occurrence of the violation of properties or the innocence of the service provider. POV schemes are solutions for obtaining mutual nonrepudiation between users and the service provider in the cloud. To the best of our knowledge, it is the first scheme that can perform response time auditing according to cryptographic evidences without the need of a delivery agent. Experimental results are presented that demonstrate the feasibility of the proposed scheme. Service providers can use the proposed scheme to provide a mutual nonrepudiation guarantee for response time in their service-level agreements. [ABSTRACT FROM AUTHOR]

A proxy signature scheme is a method which allows an original signer to delegate his signing authority to a designated person, called a proxy signer. Up to now, most of proxy signature schemes are based on the discrete logarithm problem. In this paper, we propose a proxy signature scheme and a threshold proxy signature scheme from the Weil pairing, and also provide a security proof. [ABSTRACT FROM AUTHOR]

The conflict between accepted modern cryptographic approaches to digital signatures and the venerable traditions of the law of signatures and the law of contracts has been well expounded over the last few years. During this year, hardware progress in public-key encryption has made it possible largely to bridge the gap between these two realms. This paper shows one way to do so. This is a promising time for cryptographic work on digital signatures, as well as for joint legal/cryptographic consideration of outstanding signature issues. [ABSTRACT FROM AUTHOR]