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This book provides the most complete description, analysis, and comparative studies of modern standardized and most common stream symmetric encryption algorithms, as well as stream modes of symmetric block ciphers.

Stream ciphers. --- Data encryption (Computer science) --- Data encoding (Computer science) --- Encryption of data (Computer science) --- Computer security --- Cryptography --- State ciphers --- Ciphers

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The design of code and cipher systems has undergone major changes in modern times. Powerful personal computers have resulted in an explosion of e-banking, e-commerce and e-mail, and as a consequence the encryption of communications to ensure security has become a matter of public interest and importance. This book describes and analyses many cipher systems ranging from the earliest and elementary to the more recent and sophisticated, such as RSA and DES, as well as wartime machines such as the ENIGMA and Hagelin, and ciphers used by spies. Security issues and possible methods of attack are discussed and illustrated by examples. The design of many systems involves advanced mathematical concepts and this is explained in detail in a major appendix. This book will appeal to anyone interested in codes and ciphers as used by private individuals, spies, governments and industry throughout history.

Cryptography. --- Ciphers. --- Codes --- Contractions --- Signs and symbols --- Symbolism --- Abbreviations --- Code names --- Cryptography --- Writing --- Cryptanalysis --- Cryptology --- Secret writing --- Steganography --- Ciphers --- Data encryption (Computer science) --- Mathematical Sciences --- General and Others

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From the perspective of early modernity, the presence of writing is linked to its visibility and legibility. This may be a questionable assumption, and it was especially problematic for writers in the premodern era, for whom concealment and veiling played such an important role. The aim of this book is to critically examine the category of the "restricted presence of writing," from an interdisciplinary and transcultural perspective.

Philology & Linguistics --- Languages & Literatures --- Writing --- History --- Chirography --- Handwriting --- Language and languages --- Ciphers --- Penmanship --- Invisibility. --- writing.

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Telegraph --- Electric telegraph --- Postal telegraph --- Telegrams --- Ciphers --- Communication and traffic --- Telecommunication --- History.

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Writing at Work covers everything professionals need to know about writing on the job today. The workshop is only 3.5 hours long. HR and L&D managers can use this new course to train experienced employees who already know the basics of business writing but could use a refresher.

Business writing --- Writing --- Chirography --- Handwriting --- Language and languages --- Ciphers --- Penmanship --- Business --- Authorship --- Business communication --- E-books