https://en.wikipedia.org/wiki/Cryptographic_hash_function 
Read the third and fourth bullets.

Read the whole article, for that matter.

Charles


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of Jon Perryman
Sent: Monday, August 26, 2019 3:20 PM
To: [email protected]
Subject: Re: vendor distributes their private key

 Non-repudiation for the message is not guaranteed by a hash. There is more 
than 1 message that could match that hash.

Jon.

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