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Semiotics. --- Signs and symbols.

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Signs and symbols --- Symbolism --- Symbolic anthropology --- Anthropology

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Signs and symbols --- Myth --- Signes et symboles --- Mythe --- Symbolism --- Mythes --- Symbole

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Ethnicity --- Ethnology --- Irish --- Signs and symbols --- Religious aspects --- Christianity --- Ethnic identity

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This book is almost entirely concerned with stream ciphers, concentrating on a particular mathematical model for such ciphers which are called additive natural stream ciphers. These ciphers use a natural sequence generator to produce a periodic keystream. Full definitions of these concepts are given in Chapter 2.This book focuses on keystream sequences which can be analysed using number theory. It turns out that a great deal of information can be deducted about the cryptographic properties of many classes of sequences by applying the terminology and theorems of number theory.

Ciphers. --- Number theory. --- Number study --- Numbers, Theory of --- Algebra --- Codes --- Contractions --- Signs and symbols --- Symbolism --- Abbreviations --- Code names --- Cryptography --- Writing