Message safety transfer system

The invention discloses an information security transmission system, comprising a first information device and a second information device. The first information device acquires at lest one identification data and connects with the second information device through a network to exchange information, acquires the key pair for decoding and coding by passing through or refusing passing through the identification center, establishes a data transmission security channel, encrypts and decrypts the transmitted data, and protects the security of the transmitted data. The first information device and the second information device are respectively provided with a first dynamic codec and a second dynamic codec, which execute a dynamic coding, and ensure the completed and correct data transmission and the security of the transmitted data by assorting with an automatic debugging mechanism and an automatic correcting mechanism. Besides, the transmitted data also has an accessing limit, so that the receiver can only access