Page. 13 Cloud data share and search 口 Bob sends to alice an KeyGen email encrypted under Alice s public key 口A|ice' s email gateway wants to test whether the email contains the keyword urgent so that it 3 Trapdoor PEKS could route the email to her PDA immediately. 口 But Alice does not want the email gateway to be Gateway able to decrypther T est messages Alice YES/NOPage . 13 Cloud Data share and search