Sign document with out using encryption an encryption? [closed]

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Is this possible to sign document with out using an encryption?? if possible then how ??

Normally we sign document using encrypting user private key with the message and send to other user and other user decrypt this message using sender public key. but it is this possible without encryption process any other process?

Answer 1

You can make use of hash based message authentication code's (HMAC), or even just hash codes.

For example, you can just hash the document and verify the hash to ensure no tampering occurred. Problem here is managing that hash value, because let's say you pass that hash with the document. Somebody could edit the document, update the hash, and you would be none the wiser.

A keyed hash solves all those problems, but you must properly manage that secret key.