如果碰到hash冲突的情况怎么办?有没有可能两个文件产生相同的hash值?


  • administrators

    我们相信在现代,安全,防冲突的加密Hash函数算法中Hash冲突的概率是非常之低。 而且找到hash成一个特定值(第二原像攻击)的第二个文件的可能性更小。 世界各地的密码系统依赖于这些价值是安全的,因此我们认为在Filecoin中这样做是安全的。

    也就是说,安全的Hash函数算法曾在过去破损过。 我们在安全Hash函数算法中发现的Hash冲突大多数是由于密码分析(例如md5和sha1)中的Hash函数的破损引起的。 这种可能性总是有的,大多数其他密码系统 - 如比特币,以太坊,DNSSEC,证书颁发机构,HTTPS等和其他 - 同样脆弱。 不过,我们已经为这个低概率事件计划好了应对方式!我们的内容标识符(CID)使用Multihash格式,以允许安全升级到新的HASH函数算法。


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  • X

    It shouldn't be a significant centralization risk. The costs of buying your own GPUs or starting a new outsourced proving service will be pretty low. Even if many people decide to use third-party provers, there should be a competitive and well-distributed market.

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  • X

    We're working really hard to reduce sealing and proving costs. We really want to support smaller miners, but not at the cost of security. It's always possible to make things faster and cheaper through later optimizations, but it's hard to make things more secure.

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  • X

    Why here! We will make this customizable, right now in lotus its set to some pretty big value. We might even make a special mode for 'filler storage', storage youre adding just for power that doesnt have any real deals associated with it.

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  • X

    Details around faults and recovery can be found in the spec (https://github.com/filecoin-project/specs/). The protocol will accommodate both realistic operational needs for good miners and service providers, while maintaining the security of the protocol and Quality of Service for Clients' data. Having a data storage service offline is not good for Clients, and are not good for the service. At the same time, temporary power failures happen, and the protocol needs to accommodate them to some extent. As we get closer to mainnet, we will set cryptoecon parameters and policies, and we will explain them clearly for everyone.

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