Nonrepudiation protects against repudiation by either the sender or the receiver of the data. Authentication means to identify and authenticate the party at the other end of the line. Data integrity is to protect data from modification, insertion, deletion, and replaying. Data confidentiality is to protect data from disclosure attack. We mentioned five security services: data confidentiality, data integrity, authentication, nonrepudiation, and access control.

Examples of active attacks are modification, masquerading, replaying, repudiation, and denial of service.ģ. Attacks that threaten the integrity and availability are active attacks. An active attack may change the data or harm the system. Examples of passive attacks are snooping and traffic analysis. This means that the attack does not modify data or harm the system. In a passive attack, the attacker’s goal is just to obtain information. Availability means that information needs to be available to authorized entities. Integrity means that changes to the information need to be done only by authorized entities. Confidentiality means protecting confidential information. The three security goals are confidentiality, integrity, and availability. Hundreds of examples, as well as fully coded programs, round out a practical, hands-on approach which encourages students to test the material they are learning.Sh is s a Co re tud ur d v y se ia re so H er ur o. Difficult math concepts are organized in appendices at the end of each chapter so that students can first learn the principles, then apply the technical background. A gentle introduction to the fundamentals of number theory is provided in the opening chapters, paving the way for the student to move on to more complex security and cryptography topics. While many security books assume knowledge of number theory and advanced math, or present mainly theoretical ideas, Forouzan presents difficult security topics from the ground up.

In this new first edition, well-known author Behrouz Forouzan uses his accessible writing style and visual approach to simplify the difficult concepts of cryptography and network security. Student Edition | Instructor Edition | Information Center | HomeĬryptography and Network Security Behrouz A.

Forouzan network security