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Digital signature construction quote

hello and welcome what is a digital signature a digital signature is not your signature at a store or restaurant when you use your credit card a digital signature is a method of providing accountability for electronic transactions where a handwritten signature is not possible or feasible it provides authenticity in other words the source is huah claims to be it provides non-repudiation or the inability of both sender and receiver to deny that it was sent or received and it also provides integrity or the assurance that no unauthorized changes were made before we get into the example here are some terms you should be familiar with if you aren't already if you're not familiar with these terms be sure to watch my videos on asymmetric cryptography cryptography hashing and encryption you should be familiar with the term public key private key what a hash and a digest is what encryption and decryption is and PKI or public key infrastructure as a quick review remember that for digital signatures to work each user has to have a public key and a private key this is part of the public key infrastructure needed for digital signatures to work as another quick review remember that a hash is a similar represent or a smaller representation of a larger message here is how a digital signature works the sender creates a message it can be an email a document or transmitted data but we'll just call it a message for purposes of this video the software performs a hashing function on the message to create a small digital representation called a digest the software then encrypts the hash or the digest with the sender's private key and then the message is sent on its way the encrypted hash is a pendant to the message on the receivers side if the receiver gets the message plus the encrypted digest or the hash the receiver then decrypt the hash using the sender's public key to reveal a hash or a digest the receivers software then performs the same hashing function on the original message to produce a digest the software compares the two digests to see if they're the same a few examples of digital signature software are DocuSign and Adobe Digital signatures have several practical uses such as email signatures ecommerce transactions software patches digital certificates and contract or agreement signing I hope this video has been helpful please leave any questions comments or corrections in the comment box below thanks for watching have a great day