The present disclosure describes technologies related to two-dimensional (2D) code generation and recognition. In one implementation, registration information is received from a server for authenticating and registering the server, and the server is registered if the registration information is authenticated. The registration information is then saved. A request from the server for generating a 2D code is received, wherein the request includes information to be encoded to the 2D code. The information to be encoded to the 2D code is digitally signed by generating a digital signature using asymmetrical encryption, and the digitally signed information is sent to the server to be encoded to the 2D code.