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以上来源于: WordNet
Under the assumption that the random high-density knapsack problem is infeasible, the proposed schemes are provably secure against ciphertext-only attack.
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。
Because the sensitive data is encrypted, any direct attack on the database file analysis, can only see the ciphertext.
由于敏感数据被加密，任何直接对数据库文件进行分析的攻击方式，都只能看到密文。
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