In a statement issued on Saturday, activists Anjali Bhardwaj and Amrita Johri of the organisation said the Supreme Court had issued detailed guidelines to maintain transparency.
Besides Sinha, the panel has short-listed journalist Uday Mahurkar, former Labour Secretary Heera Lal Samariya and former Deputy CAG Saroj Punhani as Information Commissioners.
Union Minister Jitendra Singh said a high level search committee follows a method of obtaining relevant information about various candidates while scrutinizing applications and shortlists candidates.
The State Chief Information Commissioner (CIC) Raja Sadaram Soma demitted office on expiry of his term on Monday, on account of attaining 65 years.
There is a vacancy of five more information commissioners at the commission after Julka's appointment as the CIC.
Chief Information Commissioner RK Mathur says PMO justified in denying information on demonetisation
The PMO had said that sharing of any information pertaining to the matter may have jeopardized the entire process of demonetisation which had been undertaken in utmost secrecy.