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A comment on USB Type-C to Become More Secure with Authentication Standard. Parent comment

Re:USB Type-C to Become More Secure with Authentication Stan... by lightedman on Wednesday January 02, 2019 @11:47PM (#18812892)
"and allow charging without authentication - who cares where I get 65 W of power from"

That 65W of power on USB-C is coming in at 20V most likely. Many devices simply will not tolerate that high of a voltage. This is why authentication and negotiation are absolutely essential.

[ Parent | on HN ]
Re:USB Type-C to Become More Secure with Authentication Stan... by geofft on Thursday January 03, 2019 @09:26AM (#18815274)
Negotiation, yes. But why authentication? Why do I care from whom the 20 V come as long as it is actually 20 V?

You can fry a regular AC-powered device by giving it 240 V power instead of 120 V, or 50 Hz instead of 60 Hz, or whatever. But we don't need authentication of power outlets. What makes USB different?

[ Parent | on HN ]