Consider the case of Alice sending a message, m, to Bob. Both Alice and Bob use public key cryptography and each has a public and private key as described in the text.  The figure attached below shows the operations that Alice must perform to provide confidentiality, authentication, and integrity when sending a message to Bob over the network. We can use either symmetric key or public key cryptography to encrypt a message.  For our purposes, either technique will encrypt the message, and applying both doesn't make it "more secure".  Also, we can assume that the session key would remain a secret so the fact that it is discarded does not make it "more secure".  Why do we use a session key, Ks, instead of relying only on public key Cryptography?  In other words, why do we use both public key and symmetric key cryptography?

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