Klima, Richard E. <br/><br/>
Cryptology :  classical and modern with maplets / 
Richard E. Klima, Neil P. Sigmon 
 - Boca Raton, FL :  CRC Press,  2012 
 - xiv, 541 p. :  ill. ;  24 cm. 
 - Discrete mathematics and its applications .
 - Discrete mathematics and its applications .
<br/><br/> "A Chapman & Hall book." 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9781439872413 (hardcover : alk. paper) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography<br/>Cryptography--Data processing<br/>Data encryption (Computer science)<br/>Ciphers