Most sensitive web transactions are protected by public-key cryptography, a type of that lets computers share information securely without first agreeing on a secret key.

Public-key encryption protocols are complicated, and in computer networks, they’re executed by software. But that won’t work in the of things, an envisioned network that would connect many different sensors — embedded in vehicles, appliances, civil structures, manufacturing equipment, and even livestock tags — to online . Embedded sensors that need to maximize battery life can’t afford the and memory space that software execution of encryption protocols would require.

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