第一章单表自然序标准密表 1.1凯撒密表 1.2模算术 1.3自然序标准密表 1.4用填充明文成份的方法破自然序标准密表 1.5用频率法破自然序标准密表 1.6自然序“抽样”密表 1.7抽样标准密表的破译 1.8基于线性变换的单表代替 The first chapter single table natural sequence standard secret table 1.1 Caesar table 1.2 modular arithmetic 1.3 natural order standard secret table 1.4 filled with plain text method to break the natural order standard secret table 1.5 by frequency method to break the natural order standard secret table 1.6 natural order “ Sampling ”close Table 1.7 standard sampling of the declassified 1.8 linear table based on a single transform instead