// Woo and Lam Pi 3 
  
 A, B, S :    principal 
 Nb :         nonce     
 Kas, Kbs :   skey      
  
  
 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      
   
 // Security Protocols Open Repository 
 // http://www.lsv.ens-cachan.fr/spore 
   
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