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Professor Willy Susilo

Signatures

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Full-Text Articles in Science and Technology Studies

Secure Single Sign-On Schemes Constructed From Nominative Signatures, Jingquan Wang, Guilin Wang, Willy Susilo Mar 2014

Secure Single Sign-On Schemes Constructed From Nominative Signatures, Jingquan Wang, Guilin Wang, Willy Susilo

Professor Willy Susilo

Single Sign-on (SSO) allows users to only log on once and then access different services via automatic authentication by using the same credential. However, most existing SSO schemes do not satisfy security notions or require a high trust level on a trusted third party (TTP), even though SSO has become popular in new distributed systems and computer networks. Motivated by this fact, we formalise a new security model of single sign-on, which not only satisfies strong security notions but also has a low trust level on TTP. We then propose a generic construction of SSO from nominative signatures, and present ...


Fairness In Concurrent Signatures Revisited, Willy Susilo, Man Ho Au, Yang Wang, Duncan S. Wong Mar 2014

Fairness In Concurrent Signatures Revisited, Willy Susilo, Man Ho Au, Yang Wang, Duncan S. Wong

Professor Willy Susilo

Concurrent signature, introduced by Chen, Kudla and Paterson, is known to just fall short to solve the long standing fair exchange of signature problem without requiring any trusted third party (TTP). The price for not requiring any TTP is that the initial signer is always having some advantage over the matching signer in controlling whether the protocol completes or not, and hence, whether the two ambiguous signatures will bind concurrently to their true signers or not. In this paper, we examine the notion and classify the advantages of the initial signer into three levels, some of which but not all ...


(Strong) Multi-Designated Verifiers Signatures Secure Against Rogue Key Attack, Yunmei Zhang, Man Ho Allen Au, Guomin Yang, Willy Susilo Mar 2014

(Strong) Multi-Designated Verifiers Signatures Secure Against Rogue Key Attack, Yunmei Zhang, Man Ho Allen Au, Guomin Yang, Willy Susilo

Professor Willy Susilo

Designated verifier signatures (DVS) allow a signer to create a signature whose validity can only be verified by a specific entity chosen by the signer. In addition, the chosen entity, known as the designated verifier, cannot convince any body that the signature is created by the signer. Multi-designated verifiers signatures (MDVS) are a natural extension of DVS in which the signer can choose multiple designated verifiers. DVS and MDVS are useful primitives in electronic voting and contract signing. In this paper, we investigate various aspects of MDVS and make two contributions. Firstly, we revisit the notion of unforgeability under rogue ...