A System to Prevent Multi-users and Multi-sessions Attack to Breach Privacy Policies in a Trust-End Filter

Among the different technological solutions realized in order to preserve data privacy, the front end trust filter could be effectively applied in environments characterized by high dynamism and untrustworthiness. Unfortunately, a preliminary assessment of this approach suggested a possible weakness: by using different user´s profiles the privacy policy can be eluded and sensitive information could be obtained by inference over legal data set. This paper proposes a solution that could be helpful for two purposes: it could be used in the design phase for identifying which use scenarios (i.e., sequences of legal queries) could threaten data privacy; additionally, it could be used for identifying users which could potentially exploit inference for disclosing confidential information.