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In this paper, we propose a new Robust Delegation Signcrypted Authentication Protocol (RD-SAP) against the False Home Location Register Attack in 3GPP. The proposed authentication protocol is based on Public Key Signcryption technique to solve the problem of FHLR attack on Tian F Lee protocol and which provides the user identity privacy, mutual authentication, nonrepudiation. This study also presents an enhanced protocol, which is not only has the same security properties as the original protocol, but also avoids the weakness in the original protocol. Therefore this scheme enjoys both computational and communicational efficiency.

Robust Delegation Signcrypted Authentication Protocol against FHLR Attack in 3GPP Wireless Communications