Previously thought limited to Apple and Google browsers, the flaw leaves communications between affected users and websites open to interception.
Updated iOS app lets you send secure group, text, picture and video messages to other Apple mobile devices, and to Android users who have the TextSecure app.
Google has taken its first step to flag ordinary sites like Wikipedia and CNN with a security warning because they are unencrypted, allowing all data transmissions to be viewed by the prying eyes of hackers or governments.
Asking whether terrorists should be given safe spaces to talk, David Cameron pledges to tighten laws that could challenge WhatsApp and other messaging apps.
But under federal law, health insurance companies don't have to encrypt user data.
The flash memory specialist announces a 200GB microSD card, drives to backup phone photos and transfer them to PCs, and a high-endurance microSD card for dashcams.
The result of an encryption issue, the newly discovered bug could have left iOS users of mobile Safari vulnerable to hackers.
Apple and Google working on fixes for the decade-old flaw, which researchers blamed on an abandoned US policy on encryption.
In the wake of government surveillance and widespread hack attacks, Finnish company Jolla has revealed a new privacy-focused operating system.
Sikur's phone, running a locked-down Android derivative, enables encrypted communications. It's one of several arriving at Mobile World Congress.