Secret messages : concealment, codes, and other types of ingenious communication /
Butler, William S.
Secret messages : concealment, codes, and other types of ingenious communication / William S. Butler and L. Douglas Keeney. - New York : Simon & Schuster, c2001. - 192 p. : ill. ; 22 cm.
Includes bibliographical references (p. 179-181) and index.
0684869985
00-046368
Ciphers.
Cryptography.
Z103 / .B88 2001
652/.8
Secret messages : concealment, codes, and other types of ingenious communication / William S. Butler and L. Douglas Keeney. - New York : Simon & Schuster, c2001. - 192 p. : ill. ; 22 cm.
Includes bibliographical references (p. 179-181) and index.
0684869985
00-046368
Ciphers.
Cryptography.
Z103 / .B88 2001
652/.8
