Abstract
This paper gives an efficient algorithm to compute addition in Jacobian of C34 curves, aiming at C34 curve cryptosystems. Using C34 curves for cryptosystems has two advantages. The first is safety and the second is the short size of the base field. In the paper, we modify the addition algorithm of [1] for Cab curves in the specific manner to C34 curves. We classify all of the forms of the Groebner bases of ideals involved in the algorithm and eliminate the use of Buchberger algorithm from it. Our resulting algorithm computes the addition in Jacobian of C34 curves in about 3 times amount of computation of the one in elliptic curves, when the sizes of groups are set to be the same.
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