Provided in the present application are a blockchain and DNSSEC-based user authentication method, a system, a device, and a medium, the method comprising: when an encrypted connection over Internet need to be performed between a server and a client, authenticating, by the server, the identity of the client by means of a blockchain-based authentication mechanism, and authenticating, by the client, the identity of the server by means of a DNSSEC-based mechanism. According to the blockchain and DNSSEC-based user authentication method provided in the present application, mutual authentication for an encrypted connection process over Internet is achieved by means of blockchain and DNSSEC-based validation mechanisms without relying on CA authentication. Thus, there are no problems of CA single point of failure or multi-CA mutual trust risk. In addition, the blockchain and DNSSEC-based user authentication method according to the present application is relatively convenient to be implemented.
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