XiaoFeng Wang Zhuowei Li Ninghui Li Jong Youl Choi PRECIP: Towards Practical and Retrofittable Confidential Information Protection. 2008 NDSS http://www.isoc.org/isoc/conferences/ndss/08/papers/12_PRECIP_towards_practical.pdf conf/ndss/2008 db/conf/ndss/ndss2008.html#WangLLC08