When two of the best debaters Parliament spar, it's time to listen in.

Finance Minister Arun Jaitley and senior Congress leader P Chidambaram, who also held the finance portfolio in the UPA government sparred in parliament today over Aadhaar, the biometric identification system that has been questioned over data privacy.

Expectedly, Chidambaram cited the example of the inadvertent leak of MS Dhoni's Aadhar details, and he questioned the government on how it would protect the privacy of transactions, facts and materials.

"The Pentagon is being hacked - what is the guarantee you can prevent the hacking of Aadhaar?" the former finance minister asked in the Rajya Sabha.

"MS Dhoni's wife has complained his Aadhaar number is being made public."

Jaitley quipped, "The Pentagon got hacked even without the Aadhaar. So the hacking doesn't happen because of Aadhaar."

Don't trivialise the question, shot back Chidambaram. "If you don't want to answer, say so."  Jaitley replied that he had a point. "If firewalls are to be breached, they can happen anywhere."

Speaking on Sakshi Dhoni's complaint, the finance minister said "it was immature behaviour on behalf of the person who went there."