The world's most widely deployed Wattesb application will remain open to spyware, the company's founder, Pavel Durov, said after Facebook's application had told its users that their phones might have been infected with a virus.
Duroff, the programmer who created the Telegram application to provide secure encrypted communications, published a blog late on Tuesday entitled "Why Watts will never be safe."
The Telegram application has been repeatedly criticized by Russian authorities for its strong encryption and has officially banned its use in the country.
"Watts has a consistent history of not having any encryption when it is created into a series of oddly appropriate security problems for espionage purposes," he wrote.
Watts told his more than 1.5 billion users around the world that the application should be updated to close the vulnerability.
That gap allowed sophisticated malware to be used to spy on journalists, activists and others.
"Every time Wattsb is forced to fix a sensitive gap in practice, another loophole is emerging," Durov said.
He hinted that the FBI may have forced Wattsp or Facebook to introduce "loopholes" or clandestine methods to circumvent security systems in its software.
"To become a privacy service, Watts has to risk losing entire markets and colliding with authorities in his home country," he said.
The brothers Pavel and Nikolai Durof founded the Telegram application and previously established the Vikontakti website, which was popular in Russia.
The number of users of Telgram 200 million users, 7% of them in Russia, according to figures announced in 2018.
In March this year, Telegram said he gained 3 million users within 24 hours when Facebook, Entragam and Wattsp faced difficulties.
In 2018, Russian authorities ordered local Internet providers to ban Telegram after the application refused to allow authorities to access users' messages.
However, efforts to close Telegram in Russia have failed, and the application is still being used.
Telegram allows users to exchange messages, posters, images, video recordings and create groups of up to 200,000 people.