Introduction

Introduction

Figure . 

Introduction

Figure . 

TO live in a modern society is to walk the delicate tightrope between a need for security and the right to privacy. The events of September 11, 2001, might have made that tightrope thinner than ever, but the truth is that this tension between security and privacy has been with us a long time.

In fact, it has been there since at least the days of the founding of the United States when the founding fathers, recognizing the need for both security and privacy, wrote the Constitution, which established a powerful federal government ...

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