This thesis explores the implementation of Chameleon Hash function in the decentralized identity management system. At the beginning, basic concepts of blockchain, consensus mechanism and CAP theorem are introduced. Next, basic concepts related to Identity Management Systems are explored. Then, the Chameleon Hash function is described. The methodology with the tools used in this thesis and the steps of the environment setup is defined. Further, web page front-end structure and its scripts, smart contract, and Chameleon Hash function implementation scripts are shown. The results of the identity management system processes are provided. Finally, the conclusion and future work related to this thesis is discussed.