Her objective is unlikely to be realised, as it's impossible for providers to decode messages sent through end-to-end encryption.
Once small scale in their ambitions, the mostly new companies making these apps sense a huge opportunity to grab business users anxious about the implications of living in the post-Snowden world.
Whats App is one of the most popular messaging apps out there.
Secure messaging apps have grown in popularity as consumers seek protection from hackers and surveillance, but end-to-end encryption faces an uncertain future in the UK.
Home secretary Amber Rudd has called for technology companies to build back door into their encrypted content for security services to use when they require access in the fight against terrorism.
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Many use encryption but operate using insecure channels in which the keys are stored centrally and hide behind proprietary technologies that mask software weaknesses.
As it happens, earlier in 2015 Facebook's Whats App started using the Text Secure platform (now called Signal – see below) from the Open Whisper Systems which improves security by using true end-to-end encryption with perfect forward secrecy (PFS).
In March, Wiki Leaks released information documenting over 8,000 CIA spying files in its 'Vault 7' collection.
Reports surrounding this claimed that the CIA was able to easily bypass Whats App's (and Signal's) security systems and read user messages.
In 2016, the company revealed that it had more than one billion users.