在高密度随机背包困难性假设下，可以证明方案在唯密文攻击下是安全的。

Under the assumption that the random high-density knapsack problem is infeasible, the proposed schemes are provably secure against ciphertext-only attack.

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分析表明，该文所设计的加密算法不但能抵抗唯密文攻击，而且能有效地抵抗选择明文攻击。

The analysis indicates that the encryption algorithm not only can effectively resist cipher-text-only attack but also chosen-plaintext attack.

youdao

分析表明，该文所设计的加密算法不但能抵抗唯密文攻击，而且能有效地抵抗选择明文攻击。

The analysis indicates that the encryption algorithm not only can effectively resist cipher-text-only attack but also chosen-plaintext attack.

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