Instruct: Classify a given review into positive or negative sentiment.
Query: Engaging and Readable

Levy does a good job of making a complex and potentially dry subject readable for a wide audience. Using an approach similar to the approach he took in _Hackers_, he uses the the personal history of the participants as a lens to study the history of a technology development._Crypto_ outlines the history of cryptography as it lurched towards public availability. Levy provides an overview of both technical and political obstacles that occurred along the way. Examines issues of control, personal freedom, and national security.