ID-based key management scheme using threshold decryption for OPMD environment

In this paper, we propose a key management scheme to protect contents in OPMD (One Person Multi Device) environment where a single user has multiple consumer devices. The proposed scheme using IBTD, a key management scheme that uses a user ID as a public key and the threshold decryption scheme that decrypts secret shares only if n the number of secret public values created by a contents server is more than t. Our proposed scheme enables users in OPMD environment to conveniently and easily use their contents through any of their multiple devices, and allows a contents server can manage keys efficiently in the user-centric key management way rather than in the device-centric key management way.