Make Noise and Whisper: A Solution to Relay Attacks (Transcript of Discussion)

Abstract

In the uninterrupted part of my presentation I explained the core of our solution and presented one example for method 1. The solution is described in detail in the paper. In the next paragraphs the discussion continues at the point where I present one example of transaction between Alice and Bob (see the image below).

OK, what happened in a different case? So in this case Bob will insert an error. Alice again sends the same bit, the white ball, which is a one, and Bob will insert an error this time. What would you expect to happen? Well, after the computation what you can see is that on the channel we get the black ball. What means that? From Alice’s perspective that means that she can detect that Bob has inserted an error because the output was different than the input. From Bob’s perspective, it’s not very clear what happened, because he inserted a black ball which means that he was inserting an error. Therefore he has no idea if Alice was inserting a white ball or a black ball, so this was the same if Alice was inserting a black ball as well.