Assemble Decline Digital Signature with airSlate SignNow

Assemble decline digital signature

The digital signature is a quite important, because it gives us the possibility for   virtually signed documents and we have sure  that the person that has signed this document   is a certain individual. For that we need  to have one public key infrastructure: it   means ,the users that are involved in the process  has to have a private key and a public key.   In this process the private key is utilized  for signed the message and the public key   is utilized to verify if the signatory is valid  or not. So, in this video we are going to see one   example of the usage of DSA algorithm - the  Digital Signatory Algorithm - we are going to   execute this process of make a sign in  a message and validate this signatory   using the java programming language. So what we  need here basically we need a possibility for   we have a specific user we are going to create  and each user has to be related to a public and   a private key and we use this native java class:  the key part generator to instantiate a key part   for the DSA algorithm. So we have two keys related  to the user once the key are generated we have two   methods: one method which we are going to sign  a specific message so here's the message and   we have to inform the private key of the user  that's going to sign this message and this return   the signature related. So the message stays as it's originally generated   and we have the signature separated in a byte  array, so here is the output of signature   implemented in a very simple way using this  native java class. The signature so we get the   instance of DSA algorithm use the init signed  method passing as parameter the private key.   After call the update method passing as parameter  device to beside it so here our message and then   finally we call the sign method to generate  the signature. If everything is correct here we are   going to have as the output the signature  as a byte array, so the signature is there   and in another use case of your system we have  to validate if this signature is valid or   not. For this proposal we need not more the  private key, but the public key. So here in our   test code our test algorithm we have signed a  specific message based on the private key of   one specific user and now we get the public  key of this user and we are going to verify   if that signature is valid or not so we get the  original message the signature file and the public   key not more the private key because the private  key just the user that make the signature has that.   So it will now in this validate signatory  method looks how it works by date signatory   we have stored the signature generated by the  sync method we have the additional message   and we...