A new construction of authentication codes with arbitration using pseudo-symplectic spaces is described.Some parameters and the probabilities of successful attacks are computed. 給出一種由偽辛幾何空間構造帶仲裁的認證碼的方法，并計算了有關參數，分析了各種攻擊成功的概率。
Single bit and multiple bits diffusion code and the method of constructing authentication code and block cipher used with them is suggested in this paper. 本文提出了單比特和多比特擴散碼以及用它們構造認證碼和分組密碼的方法。
