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# 数学代写|密码学代写Cryptography Theory代考|CSE546 The Cost of Insecurity

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## 数学代写|密码学Cryptography Theory代考|The Cost of Insecurity

There was a very high cost associated with the lack of a secure voice system. Shortly before the Japanese attack on Pearl Harbor, American cryptanalysts broke a message sent in the Japanese diplomatic cipher known as Purple. It revealed that Japan would be breaking off diplomatic relations with the United States. In the context of the times, this meant war. General Marshall knew he needed to alert forces at Pearl Harbor to be prepared for a possible attack, but, not trusting the A-3 Scrambler, he refused to use the telephone. If the Japanese were listening in, they would learn that their diplomatic cipher had been broken, and would likely change it. The United States would thus lose the benefit of the intelligence those messages provided. The result was that the message was sent by slower means and didn’t arrive until after the attack.7

SIGSALY-A Solution from the Past Applied to Speech
Fortunately, the simpler problem of enciphering text had been mastered-a perfect system had been found, namely the one-time pad (see Section 2.7) — and it was possible to create an analog of it for voice. The new device would add random values to the sound wave. It’s a method completely different from inverting and reordering subbands. It’s the story of SIGSALY.
The following are equivalent:

1. SIGSALY
2. RC-220-T-1
3. The Green Hornet
4. Project X-61753
5. Project $X$ (the atomic bomb was Project $Y$ )
6. X-Ray
7. Special Customer
Proof-see the literature.

## 数学代写|密码学Cryptography Theory代考|Plan B

Once the SIGSALY installations were in place, all that was necessary for communication was that each location have the same record. Initially spares were made, but as confidence was gained, only two copies of each record were made. Still, there was a Plan B.

Figure $10.10$ looks like a locker room, but it is simply SIGSALY’s back-up key, codenamed SIGBUSE. If for some reason the records couldn’t be used for keying purposes, SIGBUSE could generate a pseudorandom key mechanically.

Because SIGSALY would link Roosevelt and Churchill, the Americans and the British needed to be satisfied that it was secure. The British had the added concern that the operating teams, which would consist of Americans, even in London, would hear everything. Thus, in January 1943, the British sent their top cryptanalyst, Alan Turing, to America to evaluate the system. After much debate, probably reaching President Roosevelt, ${ }^{16}$ Turing was allowed access to details of the closely guarded secret project.

Turing helped by suggesting improvements to the SIGBUSE key, and he reported to the British, “If the equipment is to be operated solely by U.S. personnel it will be impossible to prevent them listening in if they so desire.” In reality, the Americans were often so focused on their jobs they had no idea what was actually said.

## 数学代写|密码学Cryptography Theory代考|The Cost of Insecurity

SIGSALYー一过去应用于语音的解决方案

1. 西格萨利
2. $\mathrm{RC}-220-\mathrm{T}-1$
3. 青蜂侠
4. 项目 $x-61753$
5. 项目 $X$ （原子弹是项目 $Y$ )
6. X射线
7. 特殊客户

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。