The sender will send an email signed with his own private key, so that the receiver can verify the signature with the sender’s public key (which he already has in his possession).The digital signature process would be as follows: If we want to give this same communication scheme authenticity, to ensure that the sender is who he says he is, and the receiver is who he says he is, we must use the digital signature. With these actions, the confidentiality of the information is achieved, since everything will be encrypted, and without the corresponding private key it cannot be decrypted. Normally, the receiver also reattaches its public key, in case the sender does not have it in its repository. The receiver, if he wants to reply to this email, will send an email encrypted with the public key of the sender that he has just received, so that the sender is able to decrypt the information with his own private key (that of the sender).Normally, the sender also attaches his public key in case the receiver does not have it in his repository. The sender will send an email encrypted with the receiver’s public key, so that the receiver is able to decrypt the message with his own private key.The communication process would be like this: Once the sender has their key pair and the receiver’s public key, and the receiver has their key pair and the sender’s public key, they can begin to communicate with each other. The private key should never leave the receiver. The receiver will also create a key pair (public and private), and send the public key to the sender, and could even upload said key to a public key repository.
The private key should never leave the issuer. Sender will create a key pair (public and private), and send the public key to the receiver, and could even upload said key to a public key repository.
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