A digital signature provides a means of ensuring the integrity of the document, confirming that it has not been changed after being signed. This is accomplished through the use of cryptographic techniques that uniquely bind the signature to the document in its original form. If the document is altered in any way after signing, the digital signature will fail verification, indicating the change. Alternatives are incorrect because they defy the purpose of a digital signature in terms of ensuring document integrity.
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How do digital signatures work?
What is the difference between digital signatures and handwritten signatures?