21st century wire say almost two years since cloud storage provider dropbox appoint former secretary state condoleezza rice board move edward snowden time call hostile data privacy snowden comment matter first appear video interview conduct guardian publish july 17 2014 article dropbox target know wannabe prism partner tell guardian put condoleezza rice board probably anti-privacy official imagine one ones oversee stellar wind think great idea hostile privacy prism nsa data collection surveillance program every citizen know prism stellar wind approve implement president george w. bush administration image adam hart-davis dropbox popular cloud storage providers hold encryption key hand nsa request data approved.snowden endorse zero knowledge systems layman term mean cloud storage providers hostile data privacy encrypt data actually host data without ability access ever zero knowledge content data big distinction one easily miss public inundate confuse doublespeak data privacy.snowden add way prove customers trust information make specific reference one cloud company spideroak provider zero knowledge systems read sci-tech news 21st century wire sci-tech filessee also 21st century wire nsa file zero knowledge systems hostile data privacy say snowden