Product showcase: Trust Onion uses rotating codewords to verify callers

Trust Onion is a free app that gives trusted groups three rotating codewords to check who they are communicating with. It also includes signed selfies, message checks, and callback requests. It is available for macOS, iOS, and Android. I tested the iPhone app with an older person, exploring setup and the tools available when a call or message raises concerns.

Summary from Help Net Security.

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