Information encryption method and device, information decryption method and device and safety system

The invention provides an information encryption method and device, an information decryption method and device and a safety system, and relates to the field of information safety. The method comprises the following steps: original data are uniformly segmented; at least two data blocks are obtained; Each data block is decomposed into k data sub-blocks to obtain a decomposition matrix R of originaldata, the reversible matrix A is used for carrying out transformation processing on the decomposition matrix R to generate an encrypted data matrix S, and any element in the encrypted data matrix S is associated with all elements in the decomposition matrix R. Wherein the corresponding decryption process is an inverse process of the encryption process. According to the method and the device, thecorresponding data matrix is obtained by utilizing the secondary confusion processing mode, and any element in the matrix is related to all elements in the matrix obtained by decomposing the originaldata, so that the security