Schneier, Bruce E-mail security : how to keep your electronic messages private / Bruce Schneier. - New York : John Wiley, c1995. - xii, 365 p. : ill. ; 24 cm. + 1 computer disc (CD ; 3/4 in.) Includes index. ISBN: 047105318X 9780471053187 Subjects--Topical Terms: Electronic mail systems LC Class. No.: HE7551 / .S36 1995 Dewey Class. No.: 005.71369 / S358e