Data encryption, Description, DES

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Telecommuncations Primer Signals, Building Blocks and Networks. Data Encryption & Description, DES, Single and Two key Concept

Educação Tecnologia

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Steganography is the practice of concealing a file, message, image, or video within another file, message, image, or video. The word steganography combines the Greek words steganos meaning "covered, concealed, or protected", and graphein meaning "writing". The first recorded use of the term was in 1499 by Johannes Trithemius in his Steganographia, a treatise on cryptography and steganography, disguised as a book on magic. Generally, the hidden messages appear to be (or be part of) something else: images, articles, shopping lists, or some other cover text. For example, the hidden message may be in invisible ink between the visible lines of a private letter. Some implementations of steganography that lack a shared secret are forms of security through obscurity, whereas key-dependent steganographic schemes adhere to Kerckhoffs's principle. The advantage of steganography over cryptography alone is that the intended secret message does not attract attention to itself as an object of scrutiny. Plainly visible encrypted messages—no matter how unbreakable—arouse interest, and may in themselves be incriminating in countries where encryption is illegal.Thus, whereas cryptography is the practice of protecting the contents of a message alone, steganography is concerned with concealing the fact that a secret message is being sent, as well as concealing the contents of the message. Steganography includes the concealment of information within computer files. In digital steganography, electronic communications may include steganographic coding inside of a transport layer, such as a document file, image file, program or protocol. Media files are ideal for steganographic transmission because of their large size. For example, a sender might start with an innocuous image file and adjust the color of every 100th pixel to correspond to a letter in the alphabet, a change so subtle that someone not specifically looking for it is unlikely to notice it.

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The chapters follow a sequence that I consider to be a logical progression through the subject matter, and in the main, follow the order of objectives stated in the BTEC unit of Electrical and Electronic Principles. The major exception to this is that the topics of instrumentation and measurements do not appear in a specifi c chapter of that title. Instead, the various instruments and measurement methods are integrated within those chapters where the relevant theory is covered. Occasionally a word or phrase will appear in bold blue type, and close by will be a box with a blue background. These emphasised words or phrases may be ones that are not familiar to students, and within the box will be an explanation of the words used in the text. Throughout the book, Worked Examples appear as Q questions in bold type, followed by A answers. In all chapters, Assignment Questions are provided for students to solve. The fi rst chapter deals with the basic concepts of electricity; the use of standard form and its adaptation to scientifi c notation; SI and derived units; and the plotting of graphs. This chapter is intended to provide a means of ensuring that all students on a given course start with the same background knowledge. Also included in this chapter are notes regarding communication. In particular, emphasis is placed on logical and thorough presentation of information, etc. in the solution of Assignment Questions and Practical Assignment reports. This Textbook supersedes the second edition of Fundamental Electrical and Electronic Principles. In response to comments from colleges requesting that the contents more closely match the objectives of the BTEC unit Electrical and Electronic Principles, some chapters have been removed and some exchanged with the companion book Further Electrical and Electronic Principles, ISBN 9780750687478. Also, in order to encourage students to use other reference sources, those chapters that have been totally removed may be accessed on the website address http://books.elsevier. com/companions/9780750687379. The previous edition included Supplementary Worked Examples at the end of each chapter. The majority of these have now been included within each chapter as Worked Examples, and those that have been removed may be accessed on the above website. This book continues with the philosophy of the previous editions in that it may be used as a complete set of course notes for students undertaking the study of Electrical and Electronic Principles in the fi rst year of a BTEC National Diploma/Certifi cate course. It also provides coverage for some other courses, including foundation/ bridging courses which require the study of Electrical and Electronic Engineering. Fundamental Electrical and Electronic Principles contains 349 illustrations, 112 worked examples, 26 suggested practical assignments and 234 assignment questions. The answers to the latter are to be found towards the end of

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