The New Encyclopædia Britannica, Volume 16Encyclopaedia Britannica, 1981 - Encyclopedias and dictionaries |
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Page 326
... cipher Figure 2 : United States Army cipher disk . to be used in the operations of encipherment and deci- pherment . The system known as the Gronsfeld cipher is identical with a Vigenère system with direct standard al- phabets , except ...
... cipher Figure 2 : United States Army cipher disk . to be used in the operations of encipherment and deci- pherment . The system known as the Gronsfeld cipher is identical with a Vigenère system with direct standard al- phabets , except ...
Page 329
... cipher letter , and subtracts each cipher letter from the key to yield the plaintext letter ; because of this , the ma- chine has sometimes been called a " letter - subtractor ma- chine . " The machine has six wheels of identical diam ...
... cipher letter , and subtracts each cipher letter from the key to yield the plaintext letter ; because of this , the ma- chine has sometimes been called a " letter - subtractor ma- chine . " The machine has six wheels of identical diam ...
Page 333
... cipher characters represented two or more different plaintext letters . Codes were expanded in the next three centuries , so that by 1860 large codes were used for diplomatic communications , and cipher systems were a rarity for this ...
... cipher characters represented two or more different plaintext letters . Codes were expanded in the next three centuries , so that by 1860 large codes were used for diplomatic communications , and cipher systems were a rarity for this ...
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