挑两个刺：
但只需重排密码表上二十六个字母的顺序，密钥就会增加到四千亿亿亿多种
26的阶乘是四百亿亿亿，不是四千亿亿亿。
John,a jazzist,will go to Japan in June to join a jazz party.
其中，J的百分比是12.8，而E的百分比是0，对其进行频率分析就毫无意义。
在June这个单词中，e不是出现了一次么，怎么能说百分比是0。
作业
1.
明码表 Q T L G N H Z M U B S A O W I D Y E C P F K X V
密码表 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
having once recognized however that the symbols stood for letters and having applied the rules which guide us in all forms of secret writings the solution was easy enough the first message submitted to me was so short that it was impossible for me to do more than to say with some confidence that the symbol of the stickman with both arms extended up in the air stood for e as you are aware e is the most common letter in the english alphabet and it predominates to so marked an extent that even in a short sentence one would expect to find it most often out of fifteen symbols in the first message four were the same so it was reasonable to set this down as e it is true that in some cases the figure was bearing a flag and in some cases not but it was probable from the way in which the flags were distributed that they were used to break the sentence up into words i accepted this as a hypothesis and noted that e was represented by the stickman with both arms extended up in the air
