最后给出了对该类方案的已知明文的同态攻击方法，弥补了该类方案理论分析上的不足。

Homeostasis attack of this kind of scheme is also proposed with known plaintext, all of these could make up the shortcoming of theory analysis.

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本文最后还证明了他们提出的两类改进型方案也不能抵御同态攻击，因而并不具有所说的安全性。

Finally this paper shows that two kinds of the improved schemes proposed by Qi can not resist the homomorphism attack, and does not have the security as Qi said.

youdao

本文最后还证明了他们提出的两类改进型方案也不能抵御同态攻击，因而并不具有所说的安全性。

Finally this paper shows that two kinds of the improved schemes proposed by Qi can not resist the homomorphism attack, and does not have the security as Qi said.

youdao