Professor Muttukrishnan Rajarajan, who is the Professor of Security Engineering and Director Institute for Cyber Security at City University has said that the “problem” with the NHS Covid app is that it is “quite sensitive”. It comes after more than half a million users in England and Wales received an alert in the seven days to July 7, the highest seven-day total since data was first published in January. Report by Patelr. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn