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In this paper, we point out that previous security models for the Designated Verifier Signature (DVS) are not sufficient because some serious problems may be caused such that the verifier cannot confirm the validity of the signature even if a scheme satisfies previous security models. Hence, our aim is to clarify rigorous security requirements for the DVS. We use the universal composability (UC) framework...
Confidential data should be encrypted in out-souring services in cloud computing environment in order to minimise the risk of data revealing. There have been many schemes, classified as searchable encryption, which provides capabilities to securely search over encrypted data through keywords without decryption key. In this paper, we try to combine the technique of searchable encryption with a secret...
The development of the GPS has recently increased the demand for the beneficial services from the mobile users' location data. If the location data are collected from various organizations, more beneficial services will be provided. However, the organizations are never able to share their location data, because they must avoid their users' privacy information leakage. Therefore, we propose a new system...
Designated Verifier Signature (DVS) guarantees that only a verifier designated by a signer can verify the “validity of a signature”. In this paper, we propose a new variant of DVS; Proxiable Designated Verifier Signature (PDVS) where the verifier can make a third party (i.e. the proxy) substitute some process of the verification. In the PDVS system, the verifier can reduce his computational cost by...
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