This book is a clear and informative introduction to cryptography and data protection--subjects of considerable social and political importance. It explains what algorithms do, how they are used, the risks associated with using them, and why governments should be concerned. Important areas are highlighted, such as Stream Ciphers, block ciphers, public key algorithms, digital signatures, and applications such as e-commerce. This book highlights the explosive impact of cryptography on modern society, with, for example, the evolution of the internet and the introduction of more sophisticated banking methods.

An Introduction to Sociolinguistics (SIXTH EDITION)

This comprehensive new edition of Wardhaugh’s textbook incorporates additional study features and numerous new and updated references to bring the book completely up-to-date, whilst maintaining the features that made the book so popular with lecturers and students: accessible coverage of a wide range of issues, clearly written, and with useful student study features.

Hermione Lee is one of the leading literary biographers in the English-speaking world, the author of widely acclaimed lives of Edith Wharton and Virginia Woolf. Now, in this Very Short Introduction, Lee provides a magnificent look at the genre in which she is an undisputed master--the art of biography. Here Lee considers the cultural and historical background of different types of biographies, looks at the factors that affect biographers, and asks whether there are different strategies, ethics, and principles required for writing about one person compared to another.

An Introduction to Psycholinguistics examines the psychology of language as it relates to learning, mind and brain as well as to aspects of society and culture. How do we learn to speak and to understand speech? Is language unique to humans? Does language influence culture? Using non-technical language, and providing concrete examples, the authors explore: How children learn to speak and read their native language; Deaf language education; Case studies of wild children and animals and what we can learn from these; Second language acquisition, second language teaching methods, and the problems associated with bilingualism; Language and the brain; The relationship between thought and language.

Film is an art form with a language and an aesthetic all its own. Since 1979, David Bordwell and Kristin Thompson's Film Art has been the best-selling and widely respected introduction to the analysis of cinema.