Computer Security and Cryptography

Computer Security and Cryptography

Alan G. Konheim

Language: English

Pages: 544

ISBN: 0471947830

Format: PDF / Kindle (mobi) / ePub

Gain the skills and knowledge needed to create effective data security systems

This book updates readers with all the tools, techniques, and concepts needed to understand and implement data security systems. It presents a wide range of topics for a thorough understanding of the factors that affect the efficiency of secrecy, authentication, and digital signature schema. Most importantly, readers gain hands-on experience in cryptanalysis and learn how to create effective cryptographic systems.

The author contributed to the design and analysis of the Data Encryption Standard (DES), a widely used symmetric-key encryption algorithm. His recommendations are based on firsthand experience of what does and does not work.

Thorough in its coverage, the book starts with a discussion of the history of cryptography, including a description of the basic encryption systems and many of the cipher systems used in the twentieth century. The author then discusses the theory of symmetric- and public-key cryptography. Readers not only discover what cryptography can do to protect sensitive data, but also learn the practical limitations of the technology. The book ends with two chapters that explore a wide range of cryptography applications.

Three basic types of chapters are featured to facilitate learning:

  • Chapters that develop technical skills
  • Chapters that describe a cryptosystem and present a method of analysis
  • Chapters that describe a cryptosystem, present a method of analysis, and provide problems to test your grasp of the material and your ability to implement practical solutions

With consumers becoming increasingly wary of identity theft and companies struggling to develop safe, secure systems, this book is essential reading for professionals in e-commerce and information technology. Written by a professor who teaches cryptography, it is also ideal for students.

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Plaintext and key will be explained. Problems to test your skills follow the text. 3.1 MONOALPHABETIC SUBSTITUTION A monoalphabetic substitution T : x ¼ (x0, x1, . . . , xn21) ! y ¼ ( y0, y1, . . . , yn21) on plaintext with letters in the alphabet Zm ; {0, 1, 2, . . . , m 2 1} is a rule specifying the substitute u(xi) for the letter xi. Here u ¼ (u(0), u(1), . . . , u(m 2 1)) is a permutation on the letters in the alphabet u : xt ! yt ¼ u(xt ); 0 t , n: We begin by examining substitutions.

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Warranties with respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose. No warranty may be created or extended by sales representatives or written sales materials. The advice and strategies contained herein may not be suitable for your situation. You should consult with a professional where appropriate. Neither the publisher nor author shall be liable for any loss of profit or any.

; . . . ; anÀ1 ) is the concatenation of n letters. We do not require that the text be understandable nor that it be grammatically correct relative to a natural language; thus Good_Morning and vUIÃ _9Uiing8 are both examples of ASCII text. Computer Security and Cryptography. By Alan G. Konheim Copyright # 2007 John Wiley & Sons, Inc. 1 2 CHAPTER 1 APERITIFS Figure 1.1 The encipherment transformation. Encipherment or encryption is a transformation process (Fig. 1.1), T enciphering the.

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