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A New Approach to Constructing Decentralized Identifier for Secure and Flexible Key Rotation - 2021

A New Approach To Constructing Decentralized Identifier For Secure And Flexible Key Rotation

Research Area:  Internet of Things


Owing to the introduction of blockchain technology, a decentralized identity model has been proposed to replace conventional identity models based on centralized authorities. The blockchain platform operated by various participants provides a new root-of-trust functionality for entity identification and access control. Each entity generates and registers its own identifier and credential (public key) to the blockchain such that any entity can obtain the other entity-s public key. When the corresponding private key is compromised, the key rotation to generate and register a new key pair should be performed. However, the current approach for cryptographically binding a decentralized identifier with a public key induces a serious security problem that results in both identity-stealing attacks and multiple identifiers for a single entity. A new decentralized identity to address the security problem above is proposed herein, which is based on a newly proposed cryptographic primitive (infinite one-way hash chain), as well as its security analysis and performance evaluation on Hyperledger Fabric and Contiki Cooja simulator. To demonstrate the applicability of the proposed decentralized identity to various security protocols, an authenticated key exchange protocol is also designed.


Author(s) Name:  Chang-Seop Park; Hye-Min Nam

Journal name:  IEEE Internet of Things Journal

Conferrence name:  

Publisher name:  IEEE

DOI:  10.1109/JIOT.2021.3121722

Volume Information:  Page(s): 1 - 1