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Envelope encryption is the usual method of using public key encryption on large amounts of data , this is because public key encryption is slow but symmetric encryption is fast . This is not news to the millions who hope their house will be their retirement savings and that they will get enough for it to see them through to the cemetery . " This is leading-edge work , " says James E. Smith , professor of electrical and computer engineering at the University of Wisconsin . This is especially a problem , because of the resources involved ; specifically , because of the new features , is one mote reprogrammed or the entire cluster ? This is the idea behind Y-PEER , a youth education network pioneered by UNFPA that now extends across 39 countries and links over 200 community-based , national and international organizations with a range of tools that help young people communicate more effectively and motivate others to stay alive and healthy .