Abstract- Twitter is a new web application playing dual
roles of online social networking and micro blogging. Users
communicate with each other by publishing text-based
posts. The popularity and open structure of Twitter have
attracted a large number of automated programs, known
as bots, which appear to be a double-edged sword to
twitter. Legitimate bots generate a large amount of benign
tweets delivering news and updating feeds, while malicious
bots spread spam or malicious con- tents.
Keywords- authorized searchable encryption, traceability,
multiple keywords subset search, cloud computing.