Digital signatures can be used to sign the message that will authenticate the sender. However, signing a message doesn't prevent a third party from reading the message. To achieve this, we need to encrypt the message and sign it.

In the following example, we are using a public key and a private key (asymmetric algorithm). We use the sender's private key to sign the message and the receiver's public key to encrypt the message. If you observe the code, we also use hash computing in this example. After encrypting the message, we hash the message.

We are going to use RSACryptoServiceProvider, along with RSAPKCS1SignatureFormatter, which will be used to create a signature.

In the following program, we convert text to a byte array using UnicodeEncoding classes, encrypt the message using the receiver's public key and the symmetric or asymmetric...