Hashcash - A Denial of Service Counter-Measure
Hashcash - A Denial of Service Counter-Measure
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发表时间：
2002
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通讯作者：
Adam Back
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作者：
Adam Back
Hashcash最初是在1997年5月提出的一种机制，用于抑制对未计量的互联网资源（如电子邮件和匿名转发器）的系统性滥用。五年过去了，本文集中介绍了各种应用、改进建议和相关的后续出版物，并描述了使用hashcash进行实验的初步经验。hashcash CPU成本函数计算一个可以用作工作量证明的令牌。成本函数的交互式和非交互式变体可以被构造，其可以分别用于服务器可以发出挑战的情况（面向连接的交互式协议）和服务器不能发出挑战的情况（通信是存储转发或面向分组的情况）。
Hashcash was originally proposed as a mechanism to throttle systematic abuse of un-metered internet resources such as email, and anonymous remailers in May 1997. Five years on, this paper captures in one place the various applications, improvements suggested and related subsequent publications, and describes initial experience from experiments using hashcash. The hashcash CPU cost-function computes a token which can be used as a proof-of-work. Interactive and noninteractive variants of cost-functions can be constructed which can be used in situations where the server can issue a challenge (connection oriented interactive protocol), and where it can not (where the communication is store–and– forward, or packet oriented) respectively.