law: Information Technology Act, 2000
  5. Legal recognition of digital signatures. – 
  Where any lay provides that information or any
  
  other matter shall be authenticated by affixing the signature or any document
  
  shall be signed or bear the signature of any person, then, notwithstanding
  
  anything contained in such law, such requirement shall be deemed to have been
  
  satisfied if such information or matter is authenticated by means of digital
  
  signature affixed in such manner as may be prescribed by the Central
  
  Government.
  Explanation.- For the purposes of
  
  this section, "signed", with its grammatical variations and cognate expressions,
  
  shall, with reference to a person, means affixing of his hand written signature
  
  or any mark on any document and the expression "signature" shall be
  
  construed accordingly.