Information hiding method of QR code

The invention discloses an information hiding method for a QR code, and the method comprises the steps: firstly obtaining verification information and hidden information according to coding information and user identity information, building a verification information retrieval table by taking the identity information and the coding information as indexes, and storing user identities and the verification information corresponding to the user identities; secondly, the hidden information is mapped into an ASCII code, the ASCII code is mapped into a Unicode code, and the Unicode code and the coded information jointly generate a QR code; and the decryption part reads the Unicode coding sequence, the coding information and the corresponding ASCII coding sequence from the QR code. And finally, determining decryption identity information and decryption verification information, further obtaining decryption coding information in the decryption verification information, and verifying whether the QR code is tampered or