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Re: [rare-dev] ecdh vs dh


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  • From: mc36 <>
  • To: , Cristina Klippel Dominicini <>
  • Subject: Re: [rare-dev] ecdh vs dh
  • Date: Mon, 29 Aug 2022 16:06:22 +0200

thanks for confirming the reception of the mail...
and thanks for taking care of the question...
please take your time, it have a good change that
i\m not right so dont put too much effort into it,
just if it really catches an interest somewhere....
thanks,
cs



On 8/29/22 16:01, Cristina Klippel Dominicini wrote:
Hi Csaba!

Sorry for the delay. For some reason, I am not receiving all the threads from
the rare list, and my mail server also blocked some messages. I will check
the archives.

Interesting question! I am honored by your mention as a skilled
mathematician, but I am more a computer engineering trying to understand and
apply the math concepts to computing problems :-D But I have some very
skilled mathematician friends that help me when I have some doubts. I will
check with them if they have any insights about your question and get back to
you soon :-)

Best regards,
Cristina

________________________________________
De: <> em nome de
mc36 <>
Enviado: sexta-feira, 26 de agosto de 2022 06:45
Para: Cristina Klippel Dominicini
Cc:
Assunto: [rare-dev] ecdh vs dh

hi,

can i ask you to help me solve a long lived question of me please:
(i ask you because you're the only well skilled mathematician i know)
(if it's outside of your interest, please forward it someone)

which is harder to find out both a and b:

( (g^a)^b) % p == ( (g^b)^a) % p
where g is 2 or 5, p is a 8192 bit prime, both well known, a and b are both
secrets
here we are talking about positive integers

or

a*b == b*a
here the computation is performed over 448bit elliptic curves


my reasoning is that reversing the multiplication should be easier than
solving the discrete logarithm problem

i see that it is an apples to oranges kind of question so a weak conjecture
is much more than enough

thanks,
cs


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