Abstract:

This paper analyzes Gu’s scheme and proposes a conspiracy attack on it. Using the conspiracy attack, any t (t is threshold value) or more LAs (license authorities) may woke together to reconstruct the secret polynomial of the license and derive the secure share keys of other LAs in P2P networks. They can also impersonate some other LAs to generate a valid partial license and break the protected mechanism of digital content in P2P network. A digital content protected scheme is presented for P2P networks based on Gu’s scheme. The new scheme can achieve all the properties in Gu’s scheme, and withstand the conspiracy attack in Gu’s scheme.

Key words: peer-to-peer(P2P) network, digital content protection, conspiracy attack

摘要：

分析了Gu等人提出的P2P网络数字内容保护方案，指出其中存在合谋攻击，即当P2P网络中大于门限值的LAA合谋，就可以重新构造网络的秘密多项式函数，得到网络的秘密参数，从而破环P2P网络的数字内容保护机制。基于该方案，提出了一种新的P2P网络数字内容保护方案，不仅具有Gu等人方案的特点，而且能抵抗合谋攻击。

关键词: P2P网络, 数字内容保护, 合谋攻击

CLC Number: 

• TP309