This text sets about analyzing a Micropayment system from the security and efficiency mainly, attempting to look for the best equalization point of the two. And it has enumerated Millicent, MicroMint and PayPal to illustrate.

• 本文主要就从微支付系统的安全和成本两方面着手进行分析,试图寻找二者的最佳平衡点,并列举了 Millicent、MicroMint 和 PayPal 三个案例举例说明。