该公钥密码体制具有较高的背包密度，因此可以抵抗低密度子集和攻击。
The cryptosystem obtains a high knapsack density, and hence it is secure against low density subset-sum 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。
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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