What is a digital signature?

How can you define digital signature?
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"To sign a document, Bob calculates a hash function of the text to be signed. He then encrypts it with his private key, which presumably only he knows. This is the digital signature."
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Electronic digital signatures are specifically important for electronic the business sector and therefore are an essential component of many assay-mark plans. To work, electronic signatures should be unforgeable. There are a number of file encryption ways to promise this degree of security.
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