关键词: 密钥管理, 移动存储设备, 多密级, 等级密钥, 授权访问

Abstract: Aiming at the key management problem of multi-level removable storage devices, a multi-level key management scheme is proposed based on the idea of the hierarchical key, which is able to satisfy the requirements of multi-level information secure interaction. The scheme constructs key relationship parameters among devices with different security levels based on the one-way hash function and the access control matrix. Besides, it designs a multi-level key derivation algorithm and a dynamic key update strategy. The analysis shows that this plan is simple and safe, and it enables the host to authorized access to the multi-level partition of the removable storage devices. In addition, the key management problem for multi-level removable storage devices can be effectively solved, which is of great significance for enhancing the security of multilevel information interaction.

Key words: key management, removable storage device, multilevel, hierarchical key, authorized access