A secure anonymous proxy signcryption scheme

Abstract

We introduce a new cryptographic primitive identity-based anonymous proxy signcryption which provides anonymity to the proxy sender while also providing a mechanism to the original sender to expose the identity of the proxy sender in case of misuse. We introduce a formal definition of an identity-based anonymous proxy signcryption (IBAPS) scheme and give a security model for it. We also construct an IBAPS scheme and prove its security under the discrete logarithm assumption and computational Diffie–Hellman assumption. Moreover, we do an efficiency comparison with the existing identity-based signcryption schemes and anonymous signcryption schemes and show that our scheme is much more efficient than those schemes, we also compare the efficiency of our scheme with the available proxy signcryption schemes and show that our scheme provides anonymity to the proxy sender at cost less than those of existing proxy signcryption schemes.

A Secure and Efficient Identity-Based Proxy Signcryption in Cloud Data Sharing

“…A proxy signcryption [6][7][8] is a cryptographic algorithm that merges the idea of signcryption and algorithm with a proxy signature. In cryptography, signcryption is a cryptographic algorithm that achieves the functionality of both confidentiality and authentication in a single reasonable step with better performance than a traditional approach.…”

“…In cryptography, signcryption is a cryptographic algorithm that achieves the functionality of both confidentiality and authentication in a single reasonable step with better performance than a traditional approach. The first signcryption scheme was proposed by Y. Zheng [1] later, several signcryption schemes have been proposed [2][3][4][5][6][7][8]. Proxy signature model, allows an entity officially delegate his/her signing right to someone so that he/she can sign a message on his/her behalf.…”

“…In 1997, Zheng [1] made the signcryption idea that accomplishes both confidentiality and authentication in a single reasonable step with better performance than the traditional methods. Later, many signcryption schemes have been proposed [2][3][4][5][6][7][8][9]. Some of these are proxy signcryption [6][7][8] which efficiently combines the idea of proxy signature with the signcryption scheme, and allows an entity to delegate its signcryption authority to a trusted agent on PKI framework.…”

“…Later, many signcryption schemes have been proposed [2][3][4][5][6][7][8][9]. Some of these are proxy signcryption [6][7][8] which efficiently combines the idea of proxy signature with the signcryption scheme, and allows an entity to delegate its signcryption authority to a trusted agent on PKI framework. To solve the key management processes in PKI, the idea of ID-based cryptography (IBC) was developed by Shamir [10] in 1984.…”

An Efficient and Provably-Secure Certificateless Proxy-Signcryption Scheme for Electronic Prescription System

“…In general, the CLPSC scheme comprises three different entities: an original signcrypter (OS), a receiver (R), and a proxy signcrypter (PS). An OS (e.g., a patient) delegates to PS (e.g., a trusted individual such as a family member or neighbor) the authority to signcrypt a message [17,18]. During proxy signcryption, OS sends his/her signing authority to PS with a delegation warrant, which consists of the identities of the delegator, a message space, and the validity time of the delegation.…”