Cryptography

Download Cryptography and Network Security (4th Edition) by William Stallings PDF

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By William Stallings

In this age of viruses and hackers, of digital eavesdropping and digital fraud, safeguard is paramount. This strong, updated educational is a finished therapy of cryptography and community defense is perfect for self-study. Explores the fundamental matters to be addressed through a community safety strength via an instructional and survey of cryptography and community protection expertise. Examines the perform of community protection through sensible purposes which were carried out and are in use at the present time. presents a simplified AES (Advanced Encryption regular) that allows readers to know the necessities of AES extra simply. beneficial properties block cipher modes of operation, together with the CMAC mode for authentication and the CCM mode for authenticated encryption. contains an increased, up to date remedy of intruders and malicious software program. an invaluable reference for process engineers, programmers, procedure managers, community managers, product advertising team of workers, and approach help experts.

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Additional info for Cryptography and Network Security (4th Edition)

Sample text

8. 1 What is the OSI security architecture? 2 What is the difference between passive and active security threats? 3 List and briefly define categories of passive and active security attacks. 4 List and briefly define categories of security services. 5 List and briefly define categories of security mechanisms. 4 that shows the relationship between security services and attacks. 4 that shows the relationship between security mechanisms and attacks. [Page 26] Part One: Symmetric Ciphers Cryptography is probably the most important aspect of communications security and is becoming increasingly important as a basic building block for computer security.

Two more definitions are worthy of note. An encryption scheme is unconditionally secure if the ciphertext generated by the scheme does not contain enough information to determine uniquely the corresponding plaintext, no matter how much ciphertext is available. That is, no matter how much time an opponent has, it is impossible for him or her to decrypt the ciphertext, simply because the required information is not there. With the exception of a scheme known as the one-time pad (described later in this chapter), there is no encryption algorithm that is unconditionally secure.

Another form of service denial is the disruption of an entire network, either by disabling the network or by overloading it with messages so as to degrade performance. [Page 15] Active attacks present the opposite characteristics of passive attacks. Whereas passive attacks are difficult to detect, measures are available to prevent their success. On the other hand, it is quite difficult to prevent active attacks absolutely, because of the wide variety of potential physical, software, and network vulnerabilities.

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