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。
2
Under the assumption that the random high-density knapsack problem is infeasible, the proposed schemes are provably secure against ciphertext-onlyattack.