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.

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每次用户登录时，都会生成一个新的密钥对，并在数据库中覆盖该公钥。

Everytime the user logs in, a new key pair is generated and the public key is overwritten in the database.

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公钥证书上的数字签名可以验证该公钥的可靠性以及持有它的那一方的可靠性。

The digital signature on a public key certificate can validate the authenticity of the public key and therefore the party who holds it.

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The right thing to do individually or collectively is to maximize, act in a way that maximizes the overall level of happiness.

于公于私，最正确的选择都该是,即为全方位地最大化地提升幸福。

耶鲁公开课 - 公正课程节选