Re: ECC point compression trick

William L. Bahn wrote:
And still the question stands - is 3 or 4 the negative square
root of 2 mod 7?

<snip>

I think we're focusing on a non-issue here.

Clearly any standard would have to mandate either a numerical or
deterministic process to determine which is the "positive root". If
the prime is 3 mod 4 then you can use the power rule. That will always
yield the same value. Regardless of who or how you implement the
exponentiation.

Oh well, I guess this is the best we can hope for usenet. Bickering
and fighting over minute details because somehow, somewhere, someone is
"more wrong" then you.

I'm sorry I brought it up.

Tom

.

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