(a)^b^c = (a)^c^b = (a)^bc
A puts a session key in side the box, encrypt with Ka and sends to B
A ------------------ B
[]Ka ------------>
[] ---------------->
B gets the box, encrypts with Kb and sends to A
<------------[]Ka
<------------[]Kb
A gets the box, decrypts with Ka and sends to B
[] ------------->
[]Kb--------->
B gets the box, descrypts with Kb and get the session key.
----------------[]
----------------[]
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