In an article titled "What does the "Year Zero" and "Vault 7" stuff from Wikileaks mean?", Pavel Durov, the Founder of social network Vkontakte and messenger Telegram, explained how CIA can read your messages even if you are using a secure messaging application.
Durov said that the hackers do not need to directly hack the targeted applications. Instead, they can exploit the vulnerabilities in the mobile operating systems to access your sensitive information and messages.
"To put 'Year Zero' into familiar terms, imagine a castle on a mountainside. That castle is a secure messaging app. The device and its OS are the mountain. Your castle can be strong, but if the mountain below is an active volcano, there's little your engineers can do." he explained. "So in the case of 'Year Zero', it doesn't matter which messenger you use."
He explained that the hackers can gain access to your keyboard that allows them to know which key you press.
"No app can hide what shows up on your screen from the system. And none of this is an issue of the app." said Durov
The founder of the Telegram urged the main developers of operating systems and devices, such as Apple, Google or Samsung, immediately start fixing their vulnerabilities.
He said that normal users do not need to worry about this. But, if the CIA is on your back, it doesn't matter which messaging apps you use as long as your device is running iOS or Android.