Raising incidents of security threats among active sessions is an increasing concern in IoT environment. Continuous authentication was introducing to be superior to traditional authentication schemes by constantly verify usersÂ’ identities on an ongoing basis and spot the moment at which an illicit attacker seizes control of the session. However, several challenges remain unsolved. . In this paper, we propose a decentralized token-based authentication based on fog computing and blockchain. The protocol provides a secure authentication protocol using access token, ECC cryptography, and also blockchain as decentralized identity storage. The blockchain uses cryptographic identifiers, records immutability, and provenance, which allows the implementation of a decentralized authentication protocol.
Key words: blockchain, IoT environment, Token ,Authentication
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