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HTTP/3 spin bit [pdf]

55 pointsby angrygoatover 5 years ago

4 comments

cesarbover 5 years ago
Some context: <a href="https:&#x2F;&#x2F;blog.apnic.net&#x2F;2018&#x2F;03&#x2F;28&#x2F;just-one-quic-bit&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blog.apnic.net&#x2F;2018&#x2F;03&#x2F;28&#x2F;just-one-quic-bit&#x2F;</a> (discussed on HN at <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=16695816" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=16695816</a>).
jakeoghover 5 years ago
Another fingerprint vector, with location leak.<p>&quot;generally lacks required precision&quot; well, generally, you combine measurement vectors to obtain required precision.
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KaiserProover 5 years ago
But each packet is numbered, why can&#x27;t one use the ACK of the numbered packet instead?
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londons_exploreover 5 years ago
Has anyone tested this out on a real network?<p>I imagine that it won&#x27;t work at all when you combine something like 3G (with random periods of hundreds of milliseconds of no packets delivered and them all queueing up), with a little packet reordering.<p>The &#x27;spin&#x27; will end up measuring half, 1&#x2F;3, or 1&#x2F;4 the original RTT. The issue won&#x27;t resolve until the connection ends up idle for at least 1 RTT.
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