Electronics and Telecommunications Research Institute

Gun-Tae Bae

Sang-Woo Lee

Yun-Kyung Lee

Hyun-Sook Cho

Jung-Yeon Hwang

Byung-Ho Chung

Sok-Joon Lee

Sin-Hyo Kim

Hye-Ran Mun

Disclosed herein is a method of verifying key validity and a server for performing the method. The method is configured such that a service provision server verifies key validity in an anonymous service for providing local linkability. The service provision server receives a revocation list. A local revocation list is generated using the received revocation list and a secret key. A virtual index of a service user required to verify key validity is calculated. Whether a key of the service user is valid is verified, based on whether the virtual index is included in the local revocation list.

Method of verifying key validity and server for performing the same

The present invention relates to a content protection apparatus and method using binding of additional information to an encryption key. The content protection apparatus includes an encryption unit for creating an encryption key required to encrypt data requested by a user terminal and then generating encrypted data in which the data is encrypted. An additional information management unit manages additional information including authority information about the encrypted data. A White-Box Cryptography (WBC) processing unit generates a WBC table required to bind the encryption key corresponding to the encrypted data to the additional information. A bound data generation unit generates bound data in which the encrypted key is bound to the additional information, using a cipher included in the WBC table.

Content protection apparatus and method using binding of additional information to encryption key

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Daejeon, South Korea

Gun-Tae Bae