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›› 2011, Vol. 28 ›› Issue (5): 642-647.DOI: 10.7523/j.issn.2095-6134.2011.5.012

• Research Articles • Previous Articles     Next Articles

A modified method for storage and revoking of the AACS device keys

YANG Hui-Hui1,2, ZHAO Xian-Feng2   

  1. 1. Graduate University, Chinese Academy of Sciences, Beiing 100049, China;
    2. State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijng 100190, China
  • Received:2010-09-20 Revised:2010-10-18 Online:2011-09-15

Abstract:

The advanced access content system is a standard for content distribution and digital rights management. It revokes compromised devices by revoking their corresponding device keys and manages them by using the subset cover tree method, which needs many device keys for storing each device. On the reasonable assumption that devices are revoked randomly and uniformly, a modified method is proposed for storage and revoking of the keys. Then, the number of the keys decreases greatly, while the number of the subset covers for legal devices only increases slightly.

Key words: AACS, device keys, subset cover tree, DRM

CLC Number: