Question: One often deploys layered encryption to secure a routing protocol. For example, a routing update originated from router A to B and then to C

One often deploys layered encryption to secure a routing protocol. For example, a routing update originated from router A to B and then to C before reaching the last hop X will be protected as follows: update when leaving A: {A, sig_by_A} update when leaving B: {B, {A, sig(A)}}, sig_by_B} update when leaving C: {C, {B, {A, sig(A)}}, sig_by_B}, sig_by_C Explain how B, C, and X will verify the integrity of the update. Discuss the vulnerability with this design we discussed in the class.

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