android security framework

WeintroducetheAndroidSecurityFramework(ASF),ageneric,extensiblesecurityframeworkforAndroidthatenablesthedevelopmentandintegrationofawidespectrumofsecuritymodelsinformofcode-basedsecuritymodules.ThedesignofASFreflectslessonslearnedfromtheliteratureonestablishedsecurityframeworks(suchasLinu