Allaying the fears of Telegram and its users, the FSB said obtaining the encryption keys does not violate users' privacy because the keys themselves are not regarded as information of restricted access.
Russia's communications watchdog on Monday began blocking access to the popular messaging app Telegram after a court banned the service for refusing to give the security services access to private conversations.
The long-running legal battle between state communications regulator Roskomnadzor and the encrypted messaging app came to a head last week when a court ordered Telegram blocked in Russian Federation.
Telegram, which was founded by a Russian entrepreneur, has repeatedly refused requests to give the FSB access to its users' encrypted messages. The number of Internet Protocol (IP) addresses that have been blocked in Russian Federation since the move has ballooned to 17 million by mid-Tuesday, from 2 million earlier in the day.
The authorities took action against Amazon and Google's cloud platforms, which Telegram uses to avoid Russian state interference.
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On Monday evening, according to Anti-Corruption Foundation activist Vladislav Zdolnikov, Roskomnadzor added four "subnet masks" to its "out-load list", which specifies the domains and websites Russian Internet providers are required to block, according to Meduza. But Roskomnadzor responded by banning more than 1.8 million IP addresses belonging to the tech giants yesterday.
"Roskomnadzor has received the ruling of (Moscow's) Tagansky court to block Telegram's services on Russian territory". Telegram is reportedly used by around 20 million Iranian citizens. APKMirror also received a request from Russian Federation to remove the Telegram app in Russian Federation.
It has been called the "app of choice for many Isis, pro-Isis and other jihadi and terrorist elements" by Washington-based Middle East Media Research Institute (MEMRI), which tracks terrorists' online communications, due to the strong level of encryption it deploys.
Clients of leading Internet providers in Russia - Beeline, Megafon, Yota, MTS, and Tele2 - said on April 16 that they were able to maintain access to Telegram by using VPNs.