Viber began encrypting messages in April, said Agaoua, whose appointment was announced Thursday and who will be based in Israel where most of the company's 350 employees work, primarily in research and development. While the company will be able to say which users spoke to one another, it won't be able to provide the content of messages, he added. "Even if we had a judge's warrant, we wouldn't be able to say what you said, because we don't have it."