law: Companies Act, 2013 
  21.
  
    Authentication
  
  of documents, proceedings and contracts.
  Save
  
  as otherwise provided in this Act,—
  a.      a document or
  
  proceeding requiring authentication by a company; or
  b.     contracts made by or
  
  on behalf of a company, may be signed by any key managerial personnel or an
  
  officer of the company duly authorized by the Board in this behalf.