PLEASE FILL OUT THE CHART GIVEN BELOW Man-in-the-middle attack when Alice and Bob employ Diffie-Hellman key exchange. Alice Carol (Intruder) Bob p=17 and α= 4 are known to all Choose kpri,A =a = 7 Choose kpri,B =b = 8 Alice’s public key: kpub,A = A= αa mod p = Bob’s public key: kpub,B = B=αb mod p = Send A to Bob; intercepted by Carol Send B to Alice; intercepted by Carol Carol chooses c=6; computes A’ = B’ =αc mod p Carol sends A’ to Bob as if it is A from Alice Carol sends B’ to Alice as if it is from Bob Alice derives the shared secret key as K1= B’a mod p Carol derives K1= Ac mod p, K2= Bc mod p, Bob derives the shared secret key as K2= A’b mod p Session 1 established with key K1: verify that Alice and Carol have derived the same key K1 Session 2 established with key K2; verify that Carol and Bob have derived the same key K2
PLEASE FILL OUT THE CHART GIVEN BELOW
Man-in-the-middle attack when Alice and Bob employ Diffie-Hellman key exchange.
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Alice |
Carol (Intruder) |
Bob |
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p=17 and α= 4 are known to all |
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Choose kpri,A =a = 7 |
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Choose kpri,B =b = 8 |
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Alice’s public key: kpub,A = A= αa mod p = |
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Bob’s public key: kpub,B = B=αb mod p = |
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Send A to Bob; intercepted by Carol |
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Send B to Alice; intercepted by Carol |
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Carol chooses c=6; computes A’ = B’ =αc mod p |
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Carol sends A’ to Bob as if it is A from Alice |
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Carol sends B’ to Alice as if it is from Bob |
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Alice derives the shared secret key as K1= B’a mod p |
Carol derives K1= Ac mod p, K2= Bc mod p, |
Bob derives the shared secret key as K2= A’b mod p |
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Session 1 established with key K1: verify that Alice and Carol have derived the same key K1 |
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Session 2 established with key K2; verify that Carol and Bob have derived the same key K2 |
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