@techreport{TR-IC-11-05,
   number = {IC-11-05},
   author = {Fabio Piva and Ricardo Dahab},
   title  =  {{E-commerce  and  fair  exchange:  The  problem  of item
                   validation}},
   month = {February},
   year = {2011},
   institution = {Institute of Computing, University of Campinas},
   note = {In English, 13 pages.
    \par\selectlanguage{english}\textbf{Abstract}
       Fair  exchange  protocols  have been widely studied since their
       proposal,  but  are  still  not  implemented on most e-commerce
       transactions available. For several types of items, the current
       e-commerce   business   models  fail  to  provide  fairness  to 
       customers.  The  item  validation problem is a critical step in
       fair  exchange, and is yet to receive the proper attention from
       researchers.  We  believe these issues should be addressed in a
       comprehensive  and  integrated  fashion  before  fair  exchange 
       protocols  can be effectively deployed in the marketplace. This
       is  the  aim  of  our  research,  and drawing attention to this
       problems  and  possible solutions is the goal of this technical
       report.
  }
}