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In the US, the government’s cryptography policy has evolved from a national
security tool to a key component of the global information superhighway. Try
Cryptography’s Role in Securing the Information Society (Computer Science and
Telecommunications Board, National Research Council, National Academy Press,
Washington, £36.95/$44.95, ISBN 0 309 05475 3) for a valuable
source of reference on policies relating to the secure handling of digital
information, especially business transactions. Edited by Kenneth Dam and Herbert
Lin, it is fairly heavy reading, but a mine of useful information.