Abstract: With the rapid development of mobile Internet and smart phone,the security of information transmission in network is more and more important.As a new technology of information storage,transmission and recognition,two-dimensional code has been widely applied in many fields.However,because the two-dimensional code coding algorithm is open and its information encryption is unimplemented,there are information danger in some areas.In this paper,a new algorithm based on singular value decomposition (SVD) was proposed to encrypt encoded data through the study of two-dimensional code coding rules and encryption algorithms.Usually the digital image files in our computer is stored in the form of matrix,and each element of the matrix is also expressed in the corresponding image coordinates of pixel va-lue.Therefore,through the computer digital image processing,there is actually a series of non negative matrix operations.Decryption is the inverse process of encryption,by obtaining the singular value decomposition and encryption of the picture matrix,and the encrypted solution of the plaintext information.The experiment shows that this method is efficient in encryption and decryption,and has good security.

Key words: Encryption, Singular value, Two-dimensional code