Abstract Most authentication schemes are using physical token such as smart cards to restrict services. Although these schemes have been widely deployed for various kinds of daily applications; there are severe challenges regarding their infrastructure requirements and security. This paper proposes an efficient authentication protocol based on user's machine-metrics. The proposed protocol uses the machine physical metrics to identify machines in the network, which provides the basic capability to prevent an unauthorized machine to access resources. Thus, machine-merics based authentication for machine can be looked as an analog of biometric-based authentication for human. The proposed protocol is employing the RC4-EA Hashing function to secure the collected machinemerics. Since it is satisfying the basic requirements of a cryptographic hash function. Therefore, the purpose of the proposed protocol is theft-proofing and guarding against attacks based on stolen or lost tokens. Also, it offers strong protection against several attacks such as credential compromising attacks.

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