authorisationmobile computinghealth careprotocolssmart phonesdata privacyemergency managementmedical information systemsmedical computing4G mobile communicationoutsourcing health data processing operationsmobile healthcare networkoverwhelming personal health informationprivacy disclosureefficient outsourced privacy access control schemesoutsourced attribute-based access mechanismoutsourced privacy-preserving scalar product computationNS3 network simulatoruser privacysecure privacy-preservingmobile-healthcare emergency