How to send a Message with a Digital Signature

In summary, to send a message:
1. A hash algorithm is used to generate the message digest from the message.

2. The message digest is fed into the digital signature algorithm that generates the signature of the message. The signing of the message is accomplished byeencrypting the message digest with the sender’s private key and attaching the result to the message. Thus, the message is a signed message.

3. The message and the attached message digest are sent to the receiver. The receiver then decrypts the attached message digest with the sender’s public key.