Churchhouse,R.F. <br/><br/>
Codes & Ciphers 

 - Cambridge  CUP  2002 
 - 240p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer/IT
<br/><br/><label>Dewey Class. No.: </label>001.54  / CHU/COD