What is Digital Signature?

Just as a handwritten signature is affixed to a printed letter for verification that the letter originated from its purported sender, digital signature performs the same task for an electronic message. A digital signature is an encrypted version of a message digest, attached together with a message. A secure digital signature system consists of two parts:

A method of signing a document such that forgery is detected, and A method of verifying that a signature was actually gene... ...

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