Abstract
The OAuth protocol is a standard that authorizes not only the IoT environment but also the client services connected to the Internet to access the resource of the user stored in the resource server without sharing the account information of the resource server. Each IoT service uses OAuth to reduce the exposure of user privacy and provides scalability and flexibility because it can take advantage of any standard-compliant service. However, in recent OAuth 2.0 protocols, security vulnerabilities such as replay attacks and CSRF are already announced. To prevent this, a variety of OAuth-based access control protocols are being researched. In this paper, we design an OAuth-based access control protocol that is safe for replay attacks in IoT environment, so that IoT service can securely access the user resource of external resource server.
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