Is SHA-256 a one-way hash function?

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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.

Posted 5-Dec-12 7:05am

Thomas Daniels

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2 solutions

Solution 1

Yes it is a one way hash function.

Try it.[^]

There are also many others.

Posted 5-Dec-12 7:14am

BC @ CV

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CPallini · Accepted Answer · 2012-12-05T09:00:00

Solution 2

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".

Posted 5-Dec-12 9:00am

CPallini

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Thomas Daniels 6-Dec-12 11:13am

Thanks.