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In this paper, we propose a new Identity-Based Certificateless Proxy Signature scheme, for the grid environment, in order to enable attribute-based authorization, fine-grained delegation and enhanced delegation chain establishment and validation, all without relying on any kind of PKI Certificates or proxy certificates. We show that our scheme is correct and secure. We also give an evaluation of the computational and communication overhead of the proposed scheme. Simulations shows satisfying results.