Cryptography and network security william stallings ppt

Published by Carmel Hall Modified over 3 years ago. Some cryptographic techniques are useful here also. A serious adverse effect means that, for example, the loss might i cause a significant degradation in mission capability to an extent and duration that the organization is able to perform its primary functions, but the effectiveness of the functions is significantly reduced; ii result in significant damage to organizational assets; iii result in significant financial loss; or iv result in significant harm to individuals that does not involve loss of life or serious, life-threatening injuries. A processing or communication service that enhances the security of the data processing systems and the information transfers of an organization.

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Two of the most commonly mentioned are: A masquerade attack usually includes one of the other forms of wklliam attack. Assures that information and programs are changed only in a specified and authorized manner.


The work is protected by local and international copyright laws and is provided solely for the use of instructors in teaching their courses and assessing student learning. Assures that systems work promptly and service is not denied to authorized users. 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 scurity degrade performance. Some cryptographic techniques are useful here also.

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The loss could be expected to have a severe or catastrophic adverse effect on organizational operations, organizational assets, or individuals. Order Downloadable Resources Order. If you're interested in creating a cost-saving package for your students, contact your Pearson rep.

Giovambattista Ianni willam This is difficult enough in a centralized data processing environment; with the use of local and wide area networks,the problems are compounded. This term covers two related concepts: Sign In We're sorry! Assures that a system performs its intended function in an unimpaired manner, free from deliberate or inadvertent unauthorized manipulation of the system.

Ensuring timely and reliable access to and use of information. Although the use of the CIA triad to define security objectives is well established, some in the security field feel that additional concepts are needed to present a complete picture. Guarding against improper information modification or destruction, and includes ensuring information non-repudiation and authenticity.

Cryptography and Network Security Chapter 1 - ppt download

Modification of secuurity simply means that some portion of a legitimate message is altered, or that messages are delayed or reordered, to produce an unauthorized effect paths 1 and 2 active. This definition introduces three key objectives goals that are at the heart of computer security: The first, illustrated in Figure 1.

This attack may have a specific target; for example, an entity may suppress all messages directed to a particular destination e. To make this website work, we log user data and share it with processors. If You're an Educator Download instructor resources Additional order info. Note there is a degree of ambiguity aecurity to decurity meaning of these terms, and overlap in their use.

We would like to prevent an opponent from learning the contents of these transmissions. The release securlty message contents is easily understood. Replay involves the passive capture of a data unit and its subsequent retransmission to produce an unauthorized effect paths 1, 2, nework 3 active. A second type of passive attack, traffic analysisis subtler.

This information might be useful in guessing the nature of the communication that was taking place. Are difficult to detect because they do not involve any alteration of the data. Introduction to Information Security Principles Lecture 1: 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.

Typically, the message traffic is sent and received in an apparently normal fashion, and neither the sender nor receiver is aware that a third party has read the messages or observed the traffic pattern.

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