pbc说明文档

pbc的说明文档，很有用的ThePBClibraryisafreeportableClibraryallowingtherapidprototypingofpairing-basedcryptosystems.Itprovidesanabstractinterfacetoacyclicgroupwithabilinearpairing,insulatingtheprogrammerfrommathematicaldetails.Knowledgeofellipticcurvesisoptional.ThePBClibraryisbuiltontopoftheG