Network security : private communication in a public world /
Kaufman, Charlie.
Perlman, Radia.
Speciner, Mike.
Englewood Cliffs, N.J.  : PTR Prentice Hall ; London : Prentice-Hall International (UK),
c1995.
Bibliography: p471-479. - Includes index
Computer security.
Computer networks
Data encryption (Computer science)
Computers