// Lowe modified BAN concrete Andrew Secure RPC 
  
 A, B :          principal      
 Kab, K'ab :     symkey         
 Na, Nb, N'b :   nonce          
 succ :          nonce -> nonce 
  
  
 1.   A -> B  :   A, Na            
 2.   B -> A  :   {Na, K'ab, B}Kab 
 3.   A -> B  :   {Na}K'ab         
 4.   B -> A  :   Nb               
   
 // Security Protocols Open Repository 
 // http://www.lsv.ens-cachan.fr/spore 
   
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