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Consider the elliptic curve group based on the equation 2 3 + + mod where = 1 8 3 7 , = 5 6 0
Consider the elliptic curve group based on the equation
mod
where
and
We will use these values as the parameters for a session of Elliptic Curve DiffieHellman Key Exchange. We will use
as a subgroup generator.
You may want to use mathematical software to help with the computations, such as the Sage Cell Server SCS
On the SCS you can construct this group as:
GEllipticCurveGF
Here is a working example.
Note that the output on SCS is in the form of homogeneous coordinates. If you do not care about the details simply ignore the rd coordinate of output.
Alice selects the private key
and Bob selects the private key
What is
the public key of Alice?
What is
the public key of Bob?
After exchanging public keys, Alice and Bob both derive the same secret elliptic curve point
The shared secret will be the
coordinate of
What is itvv
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