substitution attack

In this paper, author makes use of symplectic geometry over finite field to construct Cartesian authentication code, presents a method of its construction, and at the same time, computes its size parameters and successful probability of impersonation attack and substitution attack.

本文利用有限域上辛几何构作了Cartesian认证码，给出了它的一个构造方法，计算了其容量参数、模仿攻击和替换攻击的成功概率。

A construction of Cartesian authentication code from symplectic geometry is given. Its size parameters and its probabilities of successful impersonation attack and of successful substitution attack, are computed respectively.

在有限域的辛几何上把已有的Cartesian认证码进行了推广，得到一类新的Cartesian认证码，并且计算了新认证码的参数及模仿攻击成功的概率和替换攻击成功的概率。

In the present paper, two new constructions of Cartesian authentication codes from pseudo symplectic geometry are presented and their size parameters and their probabilities of successful impersonation attack and of successful substitution attack are computed.

本文利用有限域上的伪辛几何构作了两类Cartesian认证码，并且计算了它们的参数及成功的模仿攻击概率和成功的替换攻击概率。

As an electrophilic agent, the methyl group of methoxy species can directly attack benzene ring to produce toluene via electrophilic substitution reaction.

甲氧基物种的甲基作为一种亲电试剂，可以直接进攻苯环发生亲电取代烷基化反应生成甲苯。