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Signcryption is a cryptographic primitive which simultaneously provides both confidentiality and authenticity in a single logical step. In a proxy signature scheme, an original signer delegates his signing power to a proxy agent, who signs a message on behalf of him. This paper introduces a new proxy signcryption scheme based on the Discrete Logarithm(More)
In this paper, a new identity-based proxy signcryption scheme is presented. The proposed scheme allows partial delegation of signing rights. Consequently, a signature created by the proxy signer is distinguishable from that created by the principal signer. This level of security is a common requirement in many applications to prevent malicious proxy agents(More)
Signcryption is a public key cryptographic primitive that combines the functionalities of encryption and digital signatures in a single logical step at low computational and communications costs. This paper presents a new efficient multi-recipient identity-based signcryption scheme. The scheme provides public verifiability of ciphertext origin which is an(More)
Anonymity of consumers is an essential functionality that should be supported in any digital rights management system. Privacy protection is an important aspect for wider acceptance of consumers of DRM systems. The concept of a blind signature is one possible cryptographic solution, yet it has not received much attention in the identity-based setting. In(More)
Security is an essential requirement in the industrial world. Information leakage to competitors can cause financial problems for a company. Moreover, the wide use of the Internet as an environment for doing business and shopping calls for secure electronic transactions. Confidentiality of the information is preserved through the use of encryption schemes.(More)
Publishing digital content covered by intellectual property or copyright is faced by the challenge of countering illegal access to the digital good, while still enabling consumers to exercise their usage rights on purchased contents. Digital rights management (DRM) systems consist of architectures, protocols and technologies aimed at providing satisfactory(More)
Signcryption is a cryptographic primitive which simultaneously provides both confidentiality and authenticity in a single logical step. Signcryption based on elliptic curves provides the same level of security using smaller keys compared to schemes based on the discrete logarithm problem over finite fields. Identity-based cryptography serves as an efficient(More)