But the scheme 1 does not provide asymmetry (non-repudiation) and the scheme 2 does not resist collusion attack.
但方案1不能够提供非对称性(防抵赖性)，方案2不能够抵抗共谋攻击。
The standard deviation and concentration ratio of local evaluation was used to identify and control collusion attack.
采用基于局部评价标准差、局部评价集中度的方法识别和抑制共谋攻击；
Proposed a pay-TV scheme with user revocation, but it is a private-key scheme, also it does not provide multiple-service capability and meantime can not resist collusion attack.
Mu等人提出了一个可撤销用户的付费电视方案，但其方案是私钥方案，并且没有提供多服务的功能，同时也不能抵抗共谋攻击。
Proposed a pay-TV scheme with user revocation, but it is a private-key scheme, also it does not provide multiple-service capability and meantime can not resist collusion attack.
Mu等人提出了一个可撤销用户的付费电视方案，但其方案是私钥方案，并且没有提供多服务的功能，同时也不能抵抗共谋攻击。
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