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Lots accept digital sign

to understand digital signatures we have to begin with electronic signatures let's look at its history over 150 years ago people were using Morse code and a telegraph to electronically accept contracts believe or not obviously there are some legal challenges so in 1869 the case of holy verses Whipple Delta way the message is sent by telegraph that specific issue was do dots and dashes transmitted across a wire constitute a valid contract offer and acceptance that was the question before the court and court indeed said yes it did so New Hampshire Supreme Court said that it makes no difference whether operator writes with a steel pan on inch long or whether his pen be a copper wire or thousand miles long either case the thought is communicated to the paper by the either use of common ink or more subtle fluid known as electricity so court validated electronic signature usage in the 1980s some companies and even some progressive individuals began using fax machine for high priority or time-sensitive delivery of paper-based document well the court in addressing the issues in a few mostly non-commercial cases have been nearly anonymous in holding fax the signature to be binding there are some modern examples if you guys go to grocery store and use this signature pad to sign your signature well guess what you have used electronic signature another example if you have used your ATM machine and punch your four-digit code that is actually also an electronic signature what are the laws governing the electronic signature that is very important because you know the reason I'm giving you this a bit of a background is because lot of you think that electronic or digital signature is not legal and I'm laying out the ground that it is valid and supported by law so electronic signals law basically says that it doesn't have to be those wet signatures written the pen signature can actually include a sound or symbol or a process couple key legislation first one is called uniform electronic transmissions Act which back in 1995 the state of Utah enacted is law 46 states and DC photo Rico and Virgin Island all adapted this particular law governing the electronic signature also in year two thousand president clinton signed law called e-sign act became a federal law out of electronic signatures came digital signatures digital signatures we're talking about today it's a subset of electronic signatures since it's a subset all the laws that apply to electronic signatures will also apply to digital signatures what is the purpose of digital signatures basically digital signatures used for two main purposes number one we try to authenticate document we lock the document which means that after we digitally sign it no alteration will be allowed if somebody alters the document then we'll know about it probably the most important feature of digital signature is to lock the document itself the second purpose is to authenticate the signer of the document if it says you only signed it we just want to make sure that you only sign the document not someone else so those two are the main purposes of digital signature how do they do it digital signatures are created and verify cryptography which is the branch of applied mathematics neither of us are mathematicians so we're not going to go into this but basically all it is is that branch of mathematics deals with transforming messages into seemingly unintelligible forms and back again so encryption decryption using a public key or private key to use the digital signatures we are going to need something called digital certificate or digital ID think of this as a electronic driver license somebody has to so defy that I'm yung Lee if I'm living in a digital world because you're not going to see my signature it's all numbers in bits so we're going to carry a digital ID where do we go get it your uncle cannot issue or driver license nobody will really take it seriously the same thing applies here if OMT I issues our certificate everybody's going to say well who's omt I but if somebody says I got it from verisign then most people will know that a legitimate valid or known third-party certificate authority i'll call CA verisign is that most of all known but there are others like a Commodore or godaddy.com