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2006-01-18
P2P作为传播渠道的一个缺陷
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http://eraera.blogbus.com/logs/1833661.html
看到Running Sandwitch的"P2P是人民战争的汪洋大海——知识流通原则(二)",写的很好,这里指出一个P2P作为传播渠道的缺陷:
信息的真实性.
目前我们看到的成功P2P应用都是针对媒体信息(audio, video)的.这个现状的原因除了媒体文件体积大,对带宽的占用多以外,我看还有一个原因,就是媒体文件不易被伪造:如果你去下载"壮志凌云",结果弄来一个"反斗神鹰",那么你一眼就看穿了.
但是如果用P2P来传播文字信息,比如说blog,这个问题就致命了.我从一个不信任的人那里下载一段声称是keso的blog,我怎么知道这是keso@donews.com写的?这个人民战争的汪洋大海里,有人民,也有隐藏的敌人.
我在"Keso,我有个问题:为什么我们一定需要网站?"里说过,集中式的网站虽然有诸多不好,但至少能为我们提供身份确认.如果要把星形的发布结构改变为网状的分布式发布,那么身份确认也要改变为分布式的,否则在集中的身份确认点不能使用的时候(软/硬件故障,被攻击),身份确认无法进行,则分布的发布系统如P2P就可以很容易的被蓄意制造的假内容污染.用户被骗一次以后,这个发布系统就不再可信.
目前知道的可靠分布式身份确认机制是public key / private key加密.说它可靠,是因为对用户的计算能力要求低,但是对攻击者(通常拥有比普通用户强大得多的计算资源),要求则是很高的(只有中国彩票算法才有可能).
随机文章:
要不,弄个p2p的流言板? 2005-12-20搬家了 2006-01-24传播的思维实验 part 2 信息传递和信任关系 2006-01-21入侵keso大脑 2006-01-12BSP网站能为bloggers和读者提供什么?不能提供什么? 2005-12-07
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