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We also need end-to-end encryption of voice and text, on mobile networks. And there's absolutely no technical reason preventing it today. As for cloud: you encrypt all data before uploading it. Encrypted cloud providers do exist. Though unless you inspect their client's code, or do the encryption yourself, there's still some level of trust. Cloud computing is harder. Homomorphic encryption simply isn't practical yet. If you're doing cloud computing, you have to trust the provider.Now how does that square with the move to the cloud and handheld devices?