India’s political firmament has been rocked by alleged use of military-grade private Israeli spyware Pegasus to target smartphones of top politicians, journalists and activists. The last time such large-scale surveillance was exposed was in 2010 when the National Technical Research Organisation was accused of using off-the-air GSM monitoring machines. Gopal Krishna Pillai, then Union home secretary, tells Bhavna Vij-Aurora that hacking and surveillance, both official and non-official, are widespread and rampant. Excerpts: