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Professor Willy Susilo

Security

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Full-Text Articles in Science and Technology Studies

On The Security Of Auditing Mechanisms For Secure Cloud Storage, Yong Yu, Lei Niu, Guomin Yang, Yi Mu, Willy Susilo Mar 2014

On The Security Of Auditing Mechanisms For Secure Cloud Storage, Yong Yu, Lei Niu, Guomin Yang, Yi Mu, Willy Susilo

Professor Willy Susilo

Cloud computing is a novel computing model that enables convenient and on-demand access to a shared pool of configurable computing resources. Auditing services are highly essential to make sure that the data is correctly hosted in the cloud. In this paper, we investigate the active adversary attacks in three auditing mechanisms for shared data in the cloud, including two identity privacy-preserving auditing mechanisms called Oruta and Knox, and a distributed storage integrity auditing mechanism. We show that these schemes become insecure when active adversaries are involved in the cloud storage. Specifically, an active adversary can arbitrarily alter the cloud data ...


Security Pitfalls Of An Efficient Threshold Proxy Signature Scheme For Mobile Agents, Yong Yu, Yi Mu, Willy Susilo, Man Ho Au Mar 2014

Security Pitfalls Of An Efficient Threshold Proxy Signature Scheme For Mobile Agents, Yong Yu, Yi Mu, Willy Susilo, Man Ho Au

Professor Willy Susilo

A (t,n) threashold proxy signature scheme enables an original signer to delegate his/her signing power to n proxy signers such that any t or more proxy signers can sign messages on behalf of the original signer, but t-1 or less of them cannot produce a valid proxy signature. Based on the RSA cryptosystem, Hong proposed an efficient (t,n) threshold proxy signature for mobile agents. Cai et al. found that the scheme due to Hong is proxy-unprotected , meaning that the original signer can generate a valid proxy signature by himself. However, it is unclear whether the scheme can ...