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all right this video is on digital signatures electronic signatures or just any signatures thats created digitally and not on a physical piece of paper digital signature is a type of e-signature and is more than just a scribble it serves three purposes first we have non-repudiation that means that the sender cant deny that they sent the message then we have authentication which verifies the message came from the right source and we have integrity it means that the content hasnt been tampered with to create a digital signature algorithms like email programs create one-way hash of the content then send us private key encrypts this as value and its time stamped digital signatures are based on public key cryptography or asymmetric cryptography the sender creates two keys public and private keys are used for non-repudiation and authentication while hashing is used for integrity private key is used to lock it when you send the email and public key is used to unlock it in this case scenari