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For the following three protocols, discuss which kind of authentication (i.e. aliveness, mutual communication or data agreement) each provides.   Protocol 1: A ->   S:  (A,B) S ->   A:  {(B,KAB,T,{(KAB,A,T)}KBS)}KAS A ->   B:  {(KAB,A,T)}KBS   Protocol 2: A ->   B:  A B ->   A:  NB A ->   B:  {NB}KAS B ->   S:  {(A,{NB}KAS)}KBS S ->   B:  {(A,NB)}KBS   Protocol 3: A ->   B:  (A,NA) B ->   S:  (B,NB,{(A,NA)}KBS) S ->   A:  (NB,{(B,KAB,NA)}KAS,{(A,B,KAB,NB)}KBS) A ->   B:  ({(A,B,KAB,NB)}KBS,{NB}KAB)

For the following three protocols, discuss which kind of authentication (i.e. aliveness, mutual communication or data agreement) each provides.   Protocol 1: A ->   S:  (A,B) S ->   A:  {(B,KAB,T,{(KAB,A,T)}KBS)}KAS A ->   B:  {(KAB,A,T)}KBS   Protocol 2: A ->   B:  A B ->   A:  NB A ->   B:  {NB}KAS B ->   S:  {(A,{NB}KAS)}KBS S ->   B:  {(A,NB)}KBS   Protocol 3: A ->   B:  (A,NA) B ->   S:  (B,NB,{(A,NA)}KBS) S ->   A:  (NB,{(B,KAB,NA)}KAS,{(A,B,KAB,NB)}KBS) A ->   B:  ({(A,B,KAB,NB)}KBS,{NB}KAB)

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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For the following three protocols, discuss which kind of authentication (i.e. aliveness, mutual communication or data agreement) each provides.

 

Protocol 1:

  1. A ->   S:  (A,B)
  2. S ->   A:  {(B,KAB,T,{(KAB,A,T)}KBS)}KAS
  3. A ->   B:  {(KAB,A,T)}KBS

 

Protocol 2:

  1. A ->   B:  A
  2. B ->   A:  NB
  3. A ->   B:  {NB}KAS
  4. B ->   S:  {(A,{NB}KAS)}KBS
  5. S ->   B:  {(A,NB)}KBS

 

Protocol 3:

  1. A ->   B:  (A,NA)
  2. B ->   S:  (B,NB,{(A,NA)}KBS)
  3. S ->   A:  (NB,{(B,KAB,NA)}KAS,{(A,B,KAB,NB)}KBS)
  4. A ->   B:  ({(A,B,KAB,NB)}KBS,{NB}KAB)
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