SHA-256是单向散列函数吗？ [英] Is SHA-256 a one-way hash function?

问题描述

在阅读计算机科学中未解决的问题列表时：

http://en.wikipedia.org/wiki/List_of_unsolved_problems_in_computer_science [ ^ ]

我读过这个问题：存在单向函数吗？

但是在阅读信息时关于SHA-256，我确实读到SHA-256是一种单向加密函数。

但是如果SHA-256是单向函数，那么应该删除那个问题。 />
那么，SHA-256是不是一个单向函数？



提前谢谢。

Hi,

While reading this list of unsolved problems in computer science:
http://en.wikipedia.org/wiki/List_of_unsolved_problems_in_computer_science[^]
I did read this question: "Do one-way functions exist?"
But while reading information about SHA-256, then I did read that SHA-256 is a one-way cryptographic function.
But if SHA-256 is a one-way function, then that question should be deleted.
So, is SHA-256 a one-way function or not?

Thanks in advance.

推荐答案

是的，它是单向散列函数。



试试。 [< a href =http://www.fyneworks.com/encryption/sha-256-encryption/target =_ blanktitle =New Window> ^ ]



还有很多其他的。

Yes it is a one way hash function.

Try it.[^]

There are also many others.

Probaly（很好，很有可能）SHA-256并不能满足所有要求（来自理论定义） ）：使一个函数有损（不是一对一）具有单向函数是不够的。

Probaly (well, with very high probability) the SHA-256 doesn''t satisfy all the requirements (from the Theoretical definition): "it is not sufficient to make a function "lossy" (not one-to-one) to have a one-way function".

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