Message authentication code

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Encrypting the Tunnel

At this point, we have created an IP tunnel. but our tunnel is not protected. Only after we have secured this tunnel, can we call it a VFN tunnel. This is what we are going to achieve in this task. To secure this tunnel, we need to achieve two goals, con?dentiality and integrity. The confidentiality is achieved using encryption, i.e.. the contents that go through the tunnel is encrypted. The integrity goal ensures that nobody can tamper with the traffic in the tunnel or launch a replay attack. Integrity can he achieved using Message Authentication Code (MAC). Both goals can be achieved using Transport Layer Protocol (TLS).

TLS is typically built on top of TCP. The sample VPN client and server programs in Task 2 use UDF't so we first need to replace the UDP channel in the sample code with a TCP channel, and then establish a TLS session between the two ends of the tunnel. A sample TLS client and server program.

Reference no: EM133265558

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