Pavel Durov's comments to RFE/RL on August 28 came as Telegram faces increased pressure from Russian security agencies who have pressured the company to turn over the encrypted keys.
Those demands have worried users of the app, which is hugely popular in Russia, Iran, and other countries with authoritarian governments.
In April, a Moscow court ruled that regulators could block Telegram because of Durov's refusal to turn over the encryption keys. That sparked protests in Moscow and elsewhere.
Durov, a renowned Internet entrepreneur who left Russia under pressure in 2014 and now lives abroad, told RFE/RL that the policy change was sparked by the European Union's General Data Protection Regulation, a sweeping regulation that came into effect this year governing how Internet companies store and use personal data.
The company said there have been no such court orders to date.
The move to block Telegram -- which has met with mixed success -- has deepened concerns that the government is seeking to close avenues for dissent as President Vladimir Putin begins a new six-year term.
Pavel Chikov, a lawyer for Telegram, also defended the new policy.
"As representatives of Telegram, we have never denied the right and even the responsibility of the authorities to fight terrorism. On the contrary, they offered a civilized way: a judicial request in exchange for disclosure, and not even correspondence but only IP and phone number, Chikov said.
The interests of national security and inviolability of private life must be found. Telegram offers its own version. The FSB offered nothing, he said.
Copyright (c) 2015. RFE/RL, Inc. Reprinted with the permission of Radio Free Europe/Radio Liberty, 1201 Connecticut Ave NW, Ste 400, Washington DC 20036.