Abstract
Generally, in mobile communication environments, Wireless Authentication and Key Establishment (WAKE) protocols are essential for secure information transmission. Key Recovery (KR) protocols, including WAKE protocols, can enable an authorized third party to gain access to encrypted message data under certain lawful circumstances. However, it is not easy to construct secure and strongly privacy-preserved KR protocols for mobile communication environments due to mobile hardware resources' limitation. In this paper, we propose a security-enhanced KR protocol and then we construct a privacy-enhanced KR protocol, which is based on the security-enhanced KR protocol, for protecting users' location privacy.
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