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arXiv 0909.0236cs.CR
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正规椭圆基与环面密码

Normal Elliptic Bases and Torus-Based Cryptography

Clement Dunand, Reynald Lercier

摘要:

我们考虑有限域上代数环面$T_n(F_q)$的表示。我们利用正常的椭圆基表明,对于无穷多squarefree整数$n$和无穷多个值的$q$,我们可以编码$m$环面元素,一个小的固定开销和$m$ $ϕ(n)$ -元组的$F_q$元素,在准线性时间在$\log q$。这改进了先前已知的算法,这些算法都具有准二次复杂度。结果,编码阶段的成本现在在Diffie-Hellman密码方案中可以忽略不计。

英文摘要:

We consider representations of algebraic tori $T_n(F_q)$ over finite fields. We make use of normal elliptic bases to show that, for infinitely many squarefree integers $n$ and infinitely many values of $q$, we can encode $m$ torus elements, to a small fixed overhead and to $m$ $ϕ(n)$-tuples of $F_q$ elements, in quasi-linear time in $\log q$. This improves upon previously known algorithms, which all have a quasi-quadratic complexity. As a result, the cost of the encoding phase is now negligible in Diffie-Hellman cryptographic schemes.

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