Security of content encryption key(CEK) is based on asymmetric encryption algorithm in existing DRM systems. Asymmetric algorithm solved the problem with distribution of symmetric key. However, it is slower than symmetric algorithm. In this paper, we ...
Security of content encryption key(CEK) is based on asymmetric encryption algorithm in existing DRM systems. Asymmetric algorithm solved the problem with distribution of symmetric key. However, it is slower than symmetric algorithm. In this paper, we propose a key management mechanism which improves efficiency in content consumption while ensuring security. CEK gets protected by symmetric algorithm. User's Device Identifier(DID) is used as symmetric key. When transmitted to license server, DID is encrypted using user's private key to ensure the integrity. DID is unique for each device, and also it is unchangeable. hence, even though it is exposed, it is impossible to decrypt CEK in any other device. In this paper, we examine key's security and efficiency of encrypting and decrypting CEK.