Big Data

308 

Big Data: Storage, Sharing, and Security

respectively have the votes +1, +1, and −1, the reputation system may disclose the following

information to Alice.

Full disclosure: All tuples (Bob,+1), (Carol,+1), (David,−1) as well as the aggregated

score (+1 if sum is used) are known by Alice.

Permuted disclosure: All voters Bob, Carol, and David are known by Alice as well as

the scores but permuted so Alice cannot determine who voted what.

Identity disclosure: All voters Bob, Carol, and David are known by Alice, however,

individual votes are hidden and only the aggregated score is known by Alice.

Votes disclosure: All votes are known by Alice but the ...