Abstract: Aiming at the problem of information interaction between multi-security-level devices, a security model based on portable devices was proposed. In use of portable storage device partitions, this model established a security communication channel that transmitted the multi-level interaction problem to the problem of controlling ordered read-write operation sequences. By setting the condition of security level as well as the recognition of partitions and operation, the read-write function for partition was designed to control the read and write operation towards the interactive partition. Based on the above, by designing operation control rules between interaction devices, an effective and bidirectional controlled multi-level security interaction mechanism was built, and the theoretical prove was given. The results of simulations show that the model can realize controlled bidirectional transmission for multi-level information.

Key words: multi-level interaction, portable storage device, security model, bidirectional transmission