This research will propose what security and privacy protecting technologies can be used in the contact tracing systems. How these technologies will affect the computation burden and energy consumption on mobile phone. The advantages, disadvantages of these technologies will be analysed and discussed. We are looking for healthy volunteers, aged above 18, who are the smart phone users and are the residents in the UK. You would be invited to participate in an online survey for 1 study session. The session would take about 4 minutes of your time. You would be asked to answer some questions about using a contact tracing app and the concerns about it.