Multiple Silicon Valley technology giants are working to strengthen encryption

As tensions heighten in the ongoing San Bernardino iPhone encryption case, some of Silicon Valley's top technology companies are said to be bolstering their own security measures.

The Guardian has it on good authority that WhatsApp is planning to encrypt in-app voice calls as it does with its secure messaging service in the coming weeks. Facebook, which purchased WhatsApp for around $19 billion in 2014, is also said to be considering tighter security for its self-branded Messenger app.

Rival messaging service Snapchat is working on a secure messaging service as well, the publication said, adding that Google is looking into other uses for the technology behind an encrypted e-mail project.