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History 3/4 Deployment problems for security Effort needed in set-up too much for some cases Initial plans for security are often (too?) ambitious In many cases most of the cost in security is in deployment Example: calculate the investment to upgrade all GSM SIM cards to new ones -- N = 1.5G, process cost per unit ~ 20$ Increased number of roaming, mobile users Can not rely on local shared secrets Technical problems in some of the solutions for securing our protocols |