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arXiv 0709.0175math.AGmath.NT
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超椭圆曲线的Jacobian对

Pairings on Jacobians of Hyperelliptic Curves

Christian Robenhagen Ravnshoj

摘要:

考虑定义在有限域上的超椭圆亏格2曲线的雅可比矩阵。在雅可比矩阵的自同态环的一定限制条件下,给出了雅可比矩阵上所有非退化、双线性、反对称和伽罗瓦不变对的一个显式刻画。从这一描述可以得出,没有这样的配对可以比Weil配对更有效地计算。为了建立这个结果,我们需要一个明确的描述的表示Frobenius自同态的l-挠子群的雅可比。给出了该描述。特别是,我们表明,如果特征多项式的Frobenius自同态分裂成线性因子模l,那么Frobenius是diagonalizable。最后,在Frobenius元是自同态环的某个子环的元素的限制下,证明了如果Frobenius自同态的特征多项式分裂为模l的线性因子,则Jacobian关于l的嵌入度与总嵌入度是相同的.

英文摘要:

Consider the jacobian of a hyperelliptic genus two curve defined over a finite field. Under certain restrictions on the endomorphism ring of the jacobian we give an explicit description all non-degenerate, bilinear, anti-symmetric and Galois-invariant pairings on the jacobian. From this description it follows that no such pairing can be computed more efficiently than the Weil pairing. To establish this result, we need an explicit description of the representation of the Frobenius endomorphism on the l-torsion subgroup of the jacobian. This description is given. In particular, we show that if the characteristic polynomial of the Frobenius endomorphism splits into linear factors modulo l, then the Frobenius is diagonalizable. Finally, under the restriction that the Frobenius element is an element of a certain subring of the endomorphism ring, we prove that if the characteristic polynomial of the Frobenius endomorphism splits into linear factors modulo l, then the embedding degree and the total embedding degree of the jacobian with respect to l are the same number.

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