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The main purpose for the use of digital signatures is to assure data:
Integrity
Authenticity
Availability
Confidentiality
The main purpose of digital signatures is to provide the authenticity, that is only one who owns the private key can produce a signature and then this signature can be verified by anyone who has the signer's public key. Digital signature also provides integrity because the signature generation algorithm usually hashes the message before signing on the message digest. Confidentiality is provided by encryption schemes. Availability is one of properties of information security. Comment: The only way to verify a digital signature is if the integrity of the message is intact. You can't have one without the other, otherwise it would be possible to copy and paste a previously created signature onto anything.
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