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Journal of Ambient Intelligence and Humanized Computing

PUF-based mutual authentication and session key establishment protocol for IoT devices

Fahem Zerrouki, Samir Ouchani, Hafida Bouarfa

Published Aug 6, 2022• 34 citations
Publisher
DOI
10.1007/s12652-022-04321-x

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Recently, Zerrouki et al. proposed a Physically Unclonable Function (PUF) mutual authentication and session key establishment protocol for IoT (Internet of Things) devices. Zerrouki et al.’s PUF protocol is interesting because it does not require the storage of any sensitive information on the local memory of the IoT device, which avoids many potential attacks, especially side-channel attacks. Therefore, we carefully investigate the security of Zerrouki et al.’s PUF protocol under the leakage assumption of the session key. Our findings are in the following. First, Zerrouki et al.’s PUF protocol fails to provide known-key security. That is, the adversary can impersonate not only the server to cheat the IoT device but also the IoT device to cheat the server when the adversary corrupts a session key between the server and the IoT device. Second, Zerrouki et al.’s PUF protocol suffers from the key-compromise impersonation attack. It means that the adversary can impersonate the IoT device to cheat the server if the adversary discloses the server’s secret key. Third, Zerrouki et al.’s PUF protocol does not support backward secrecy for the session key. That is, the adversary is always able to derive the session key from the previous session key. We also suggest the root cause of these security flaws in Zerrouki et al.’s PUF protocol. As a case study, our cryptanalysis results would promote a security model for more robust and efficient PUF authentication and session key establishment protocol. Moreover, our idea of the key compromise can be used to evaluate other novel PUF protocol designs.

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Peer to Peer (P2P) or direct connection IoT has become increasingly popular owing to its lower latency and higher privacy compared to database-driven or server-based IoT. However, wireless vulnerabilities raise severe concerns on IoT device-to-device communication. This is further aggravated by the challenge to achieve lightweight direct mutual authentication and secure key exchange between IoT peer nodes in P2P IoT applications. Physical unclonable function (PUF) is a key enabler to lightweight, low-power and secure authentication of resource-constrained devices in IoT. Nevertheless, current PUF-enabled authentication protocols, with or without the challenge-response pairs (CRPs) of each of its interlocutors stored in the verifier’s side, are incompatible for P2P IoT scenarios due to the security, storage and computing power limitations of IoT devices. To solve this problem, a new lightweight PUF-based mutual authentication and key-exchange protocol is proposed. It allows two resource-constrained PUF embedded endpoint devices to authenticate each other directly without the need for local storage of CRP or any private secrets, and simultaneously establish the session key for secure data exchange without resorting to public-key algorithm. The proposed protocol is evaluated using the Mao and Boyd logic as well as the automatic security analysis tool ProVerif to corroborate its mutual authenticity, secrecy, and resistance against replay and man-in-the-middle attacks. Using two Avnet Ultra96-V2 boards to emulate the two IoT endpoint devices of a network, a physical prototype system is also constructed to demonstrate and validate the feasibility of the proposed secure P2P connection scheme.

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Recently, Zerrouki et al. proposed a Physically Unclonable Function (PUF) mutual authentication and session key establishment protocol for IoT (Internet of Things) devices. Zerrouki et al.’s PUF protocol is interesting because it does not require the storage of any sensitive information on the local memory of the IoT device, which avoids many potential attacks, especially side-channel attacks. Therefore, we carefully investigate the security of Zerrouki et al.’s PUF protocol under the leakage assumption of the session key. Our findings are in the following. First, Zerrouki et al.’s PUF protocol fails to provide known-key security. That is, the adversary can impersonate not only the server to cheat the IoT device but also the IoT device to cheat the server when the adversary corrupts a session key between the server and the IoT device. Second, Zerrouki et al.’s PUF protocol suffers from the key-compromise impersonation attack. It means that the adversary can impersonate the IoT device to cheat the server if the adversary discloses the server’s secret key. Third, Zerrouki et al.’s PUF protocol does not support backward secrecy for the session key. That is, the adversary is always able to derive the session key from the previous session key. We also suggest the root cause of these security flaws in Zerrouki et al.’s PUF protocol. As a case study, our cryptanalysis results would promote a security model for more robust and efficient PUF authentication and session key establishment protocol. Moreover, our idea of the key compromise can be used to evaluate other novel PUF protocol designs.
Device authentication and key exchange protocol are essential front line of access controls in IoT security, and physical unclonable function (PUF) is a key enabler to lightweight, low-power and secure authentication of internet enabled endpoint devices in IoT. Current PUF-enabled authentication protocol requires the verifier to store a sufficiently large number of challenge-response pairs (CRPs) of each of its interlocutors, which makes the protocol impractical in application scenarios where the verifier is a resource-constrained device, especially when the verifier needs to communicate with multiple PUF- embedded endpoints. To solve this problem, a new lightweight PUF-based mutual authentication and key-exchange protocol is proposed in this paper to allow two resource-constrained PUF embedded endpoint devices to authenticate each other without the need to store the CRPs locally, and simultaneously establish the session key for secure data exchange without resorting to public-key algorithm. The PUF response reliability is mitigated by the use of reverse fuzzy extractor to offload the compute- intensive error decoding to the server during the initialization phase of the protocol. The proposed protocol is evaluated using ProVerif to corroborate its secrecy, mutual authenticity as well as resistance against replay and man-in-the-middle attacks.
Peer to Peer (P2P) or direct connection IoT has become increasingly popular owing to its lower latency and higher privacy compared to database-driven or server-based IoT. However, wireless vulnerabilities raise severe concerns on IoT device-to-device communication. This is further aggravated by the challenge to achieve lightweight direct mutual authentication and secure key exchange between IoT peer nodes in P2P IoT applications. Physical unclonable function (PUF) is a key enabler to lightweight, low-power and secure authentication of resource-constrained devices in IoT. Nevertheless, current PUF-enabled authentication protocols, with or without the challenge-response pairs (CRPs) of each of its interlocutors stored in the verifier’s side, are incompatible for P2P IoT scenarios due to the security, storage and computing power limitations of IoT devices. To solve this problem, a new lightweight PUF-based mutual authentication and key-exchange protocol is proposed. It allows two resource-constrained PUF embedded endpoint devices to authenticate each other directly without the need for local storage of CRP or any private secrets, and simultaneously establish the session key for secure data exchange without resorting to public-key algorithm. The proposed protocol is evaluated using the Mao and Boyd logic as well as the automatic security analysis tool ProVerif to corroborate its mutual authenticity, secrecy, and resistance against replay and man-in-the-middle attacks. Using two Avnet Ultra96-V2 boards to emulate the two IoT endpoint devices of a network, a physical prototype system is also constructed to demonstrate and validate the feasibility of the proposed secure P2P connection scheme.