SECRET CODES AND CIPHERS                                                        

                                                                                

CODES HAVE BEEN IMPORTANT TO MANKIND ALMOST SINCE THE BEGINNING OF WARFARE AND ESPIONAGE. INDEED, EVEN SMOKE SIGNALS AND NATIVE DRUMS HAVE BEEN USED TO COMMUNICATE I A PRIMITIVE FORM OF CODE. THIS BOOK THOROUGHLY EXAMINES AND EXPLAINS TRANSPORTATION AND SUBSTITUTION CIPHER SYSTEMS AS WELL AS THE MAJOR CODE SYSTEMS: CODE GROUPS, ONE AND TWO PART CODES, AND ENCIPHERED CODES. A COMPREHENSIVE WORK ON AN EXTREMELY INTERESTED SUBJECT.                                                

                                                                                

5.5" X 8.5", SOFTCOVER, 86 PAGES.