In a one-page letter, Chidambaram has asked Singh to ''instruct'' the Planning Commission to bring a note to the cabinet on the status of the UIDAI, so that there is ''clarity'' on which agency – the Registrar-General of India (RGI) or the UIDAI – will carry on with the task of capturing the biometric data of the population.
The UIDAI comes under the nodal authority of the Planning Commission while the RGI functions under the home ministry.
Meanwhile the home secretary has also written to the cabinet secretary, saying that the UID data is not reliable as anyone can get themselves registered under any name with any address.
The note also says that the UID doesn't accept the ministry of home affairs' data as it sees the ministry as competition.
The letter comes not just in the wake of a standing committee of Parliament rejecting the UIDAI bill, but two articles in the media attacking Chidambaram for obstructing the progress of the scheme.
'Some inspired stories have appeared in the media painting the MHA black and presenting distorted facts. I enclose two extracts – one from Tthe Economist and the other from the Hindustan Times,'' Chidambaram has written.
Both letters have been accessed by sections of the media.
The home minister says in his letter that the work of the RGI - which had been asked to collect biometric data of all usual residents in the country and send it to the UIDAI for checking duplication and generating Aadhar numbers - was ''proceeding well and is expected to be completed by mid-2013''.
''Since there is no clarity on who will capture the biometric data - the RGI or the UIDAI - I had requested the Planning Commission a few months ago to bring a paper to the cabinet or the appropriate cabinet committee and obtain a decision in the matter,'' he has written, adding that he himself had spoken to Ahluwalia several times on this.
Chidambaram ends his letter to the prime minister saying, ''In my respectful submission, it would not be in the interest of the government to allow the controversy to be played out in the media.''
In his earlier letter to Plan panel chief Ahluwalia, the home minister had insisted that data collected by the UIDAI did not meet the degree of assurance required under the National Population Register from the point of view of national security.
He had said that the possibility of inclusion of non-usual residents and creation of a false identity profile is very real.
However, UIDAI chairman Nilekani had riposted, "The Aadhaar cards have been given based on the UID data taken as per the accepted procedure."
Opinions on the matter are as divided as the above correspondence suggests. Some feel the problem has arisen because the logical order of the UID project has been put back to front. The assurance of a unique identity came first, then followed fund allocation, and then a feasibility study and the bill to govern it, which has been rejected by the standing committee.
As a result of this the UIDAI exercise has blown up Rs672 crore up to November 2011 without any tangible results to show for it, they say.
Others say that Nilekani, an information technology specialist before he was roped in for the project by Prime Minister Singh, is the right man for the job, but is being stymied by lack of funds and facilities and opposition from the home ministry to what it regards as a parallel centre, which invades on its turf.