第112章 套取情报(1 / 2)

第112章套取情报

十五份电文中,有七份是中统湘潭站发出的。

余则成将这七份电文抽出来单独排在一边。他将这七份电文的前六个电码单独写在黑板上。按照中统的习惯,如果是发给上峰的电文,前六个字应该是:XX(姓名)XX(职务)钧鉴;

然后将自己已经破译的中统电文中“钧鉴”两个字的电文“6874、7003”翻译出来,排在这六组电码上方。

余则成首先将七份电文第五个字码减去“6874”,将差额写在左侧。

随后又将七份电文的第六个字码减去“7003”,将差额写在右侧。

再从中寻找着差额之间有什么联系?其中,左侧有两组差额都是偶数。其他五组都是奇数。

再看看右侧,也是一样,两组对应左侧偶数的,也是偶数;对应右侧奇数的也是奇数!

这是一个重大发现!余则成内心里大喜!他再看看日期。奇数的电文都是双日发出的。偶数的电文都是单日发出的。这说明这种加密跟日期有关!并且是日期跟什么的乘数!如果这个密码只是二重加密的话,这个“什么”还跟奇数有关系!当然,这个密码要是三重加密的话,那就不一定了。

如果是余则成统计小组来计算,那这几份电文可以说基本破译了!可是,他还不能让计算小组来做。他自己做的话,计算量太大,不知道要计算到何年何月了。这让他一下子像是掉进了冰窟窿里。

不过,既然老吕这么看重这几份电文,余则成还是要按步骤来破译。第一,要先确实是不是二重加密?

余则成将差额数字除以日期,没有一个除得通!他再将差额除以日期最大得数之后的差额记下来。互相之间也没有联系。那就说明是三重加密。

要是三重加密,首先必须确定一个破译的方案!这个破译方案要是正确了,就能减少九成的计算量。怎么设计这个破译方案呢?

余则成首先假设这两部密码是同源的。否则,这十几份样本根本不够,又不知道相关内容,对于他一个人来说,破译就无从谈起。

如果假定是同源,那就要在这些电文的差额上动脑筋。最关键的是,余则成手里的这份密码并不是母码。还要将这份密码还原成母码。然后才能考虑在母码基础上破译三重加密。

余则成又将原来破译杜进民密码的过程回忆一遍,又将那一份破译的密码本拿出来。这本密码本肯定也不是母码。他只是要两本密码本之间的联系。因为杜进民这份密码是跟日本人临时联系的,密级相对较低。所以,余则成一直没有将这份密码本拿出来对照。他只是要这个思路。

余则成整整三天没有出门,一个人计算了三天。

武奎元看到余则成胡子拉茬的,心里很心疼,说:“则成,你这么拼命干什么呀?”

吴忆梅也在一边说:“是啊!过几天就要撤离了。你何必呢?搞得统计组也不去了,家里也不顾了!”

余则成想到这三天将两个小娘子冷落到一边了;觉得是有点过分。他露齿一笑,说:“今晚好好陪一陪两个美娇娘!不算了!”

说着,余则成就一手搂着一个,要往房间里走。

“叮铃铃……”

电话响了!

余则成将电话拿起来,问道:“是谁?”

“是我!老吕!”

“吕长官!”余则成喊了一句,就等老吕的下文。

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