TRUST BASED PROFILE COORDINATING SECURE SOCIAL SYSTEMS

The statistics of photo sharing on social networks proposes a three realms
model: a social realm, in which identities are entities, and friendship is a relation;
second, a visual sensory realm, of which faces are entities, and co-occurrence in
images a relation; and third, a physical realm, in which bodies belong, with physical
proximity being a relation. Information sharing is an attractive feature which
popularizes Online Social Networks (OSNs). To prevent possible privacy leakage of
photos, we design a mechanism to enable each individual in a photo be aware of the
posting activity and participate in the decision making on the posting and tagging.
Unfortunately, it may leak users’ privacy if they are allowed to post, comment, and
tag a photo freely. If a request is sent to another person it will show the matches and
mismatches. Then for user tagging or adding to a group it will not automatically tag
it will ask for permission from the user. Each user is able to define his/her privacy
policy and exposure policy. Only when a photo is processed with owner’s privacy
policy and co-owner’s exposure policy could it be posted. However, the co-owners
of a co-photo cannot be determined automatically, instead, potential co-owners
could only be identified by using the tagging features on the current OSNs.