law: Information Technology Act, 2000
  17. Appointment of Controller and other
  
  officers. – 
  (1) The Central Government may, by
  
  notification in the Official Gazette, appoint a Controller of Certifying Authorities
  
  for the purposes of this Act and may, also by the same or subsequent
  
  notification, appoint such number of Deputy Controllers and Assistant
  
  Controllers as it deems fit.
  (2) The Controller shall discharge his
  
  functions under this Act subject to the general control and directions of the
  
  Central Government.
  (3) The Deputy Controllers and Assistant
  
  Controllers shall perform functions assigned to them by the Controller under
  
  the general superintendence and control of the Controller.
  (4) The qualifications, experience and terms
  
  and conditions of service of Controller, Deputy Controllers and Assistant
  
  Controller shall be such as may be prescribed by the Central Government.
  (5) The Head Office and Branch Officer of the
  
  officer of the Controller shall be at such places as the Central Government may
  
  specify, and these may be established at such places as the Central Government
  
  may think fit.
  (6) There shall be a seal of the Office of the
  
  Controller.