Digital Signature is a sort of cryptography. It deals with keeping data private. It a method of converting data and messages into a different form ie encrypting it with the help of a key.
The message can be converted using a code where each character or a group of characters is substituted by a different one or by using a cipher where the message as a whole is converted rather than individual characters. It basically deals with encryption, decryption and authentication.
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Digital signatures are mostly used for authentication purpose.but mind it that we need to get digital signature certificate to create a digital signature and only authorized companies can issue this certificate
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