Session 1: A to X
A -> X: {Na, A}PKX
X -> A: {Na, Nb}PKA
A -> X: {Nb}PKX
Session 2: X (as A) to B
A(X) -> B: {Na, A}PKB
B -> A(X): {Na, Nb}PKA
A(X) -> B: {Nb}PKB
(Lowe’s modification to fix it: B -> A: {Na, Nb, B}PKA)
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