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In this paper, we present a strong universal designated multi verifier signature scheme based on bilinear pairings, which does not resort to random oracles. The security of the proposed scheme relies on the hardness of solving q-Strong Diffie-Hellman problem. The proposed scheme is more efficient than the existing universal designated multi verifier… (More)
BACKGROUND The issue of a possible malignant transformation in the lesions like epithelial dysplasia and oral lichen planus (OLP) is a matter of serious controversy. The purpose of this study was to suggest the malignant transformation rate in OLP and oral epithelial dysplasia (OED) by using immunohistochemical expression of the tumor markers Ki-67, p53,… (More)
Key issuing protocols deal with overcoming the two inherent problems: key escrow and secure channel requirement of the identity based cryptosystems. An efficient key issuing protocol enables the identity based cryptosystems to be more acceptable and applicable in the real world. We present a secure and efficient threshold key issuing protocol. In our… (More)
Non-Hodgkin's lymphoma (NHL) is primarily a disorder of lymph nodes, when limited primarily to extranodal sites it is referred to as primary extranodal lymphoma and accounts for 24-48% of all cases of NHL. The development of peripheral T-cell lymphoma is poorly understood and is thought to be associated with effector T cells involving chromosomal… (More)
Bilinear pairings based mutual authentication scheme using smart card is presented. We propose a novel technique of using two different servers, one for registration and other for authentication. The scheme is resilient to replay, forgery, man-in-the-middle and insider attacks.