In a multi-proxy multi-signature scheme, a group of original signers can delegate the signing rights to a group of proxy signers. All proxy signers cooperatively sign messages on behalf of the original group. Recently, Sahu and Padhye proposed an identity-based multi-proxy multi-signature (IBMPMS) scheme which was claimed to be secure against existential forgery on adaptive chosen-message and a...

In 1998, Blaze, Bleumer, and Strauss (BBS) proposed proxy re-signatures, in which a semi trusted proxy acts as a translator between Alice and Bob. The proxy resignature schemes can be applied in many applications. However, the existing proxy re-signature schemes were all based on Diffie-Hellman assumption. In this paper, we present a proxy re-signature scheme based on quadratic residues, which ...

In this paper, we first propose the definition and security model of certificate-based proxy signature (CBPS). We then show that the certificate-based proxy signature scheme presented by Kang, Park and Hahn in CT-RSA 2004 are insecure against key replacement attacks. We further propose two certificate-based proxy signature schemes, which are shown to be existentially unforgeable against adaptiv...

In this paper it has been attempted to investigate the capability of the consumption-based capital asset pricing model (CCAPM), using the general method of moment (GMM), with regard to the Epstien-zin recursive preferences model for Iran's capital market. Generally speaking, recursive utility permits disentangling of the two psychologically separate concepts of risk aversion and elasticity of i...

In a (t, n) threshold proxy signature scheme, an original signer can delegate the signature authority to a proxy group of n member such that t or more than t proxy signers can cooperatively sign messages on behalf of the original signer, but t − 1 or fewer proxy signers cannot generate a valid proxy signature. In this paper, we review the security of C. L. Hsu et al.’s threshold proxy signature...

Background: Child-parent agreement is a controversial aspect of measuring health-related quality of life (HRQoL) in children and adolescents. The aim of this study was to assess the agreement between the child self-reports and parent proxy reports of the PedsQL 3.0 Asthma Module in Iranian children with asthma to evaluate HRQoL. Moreover, the psychometric properties of the child and parent repo...