Franksen, Ole Immanuel.

Mr. Babbage's secret : the tale of a cypher-and the APL / Ole Immanuel Franksen ; foreword by H.H. Goldstein. - Birkerod : Strandberg, 1984. - 319 p. : ill. ; 22 cm.

8787200864


Babbage, Charles, 1791-1871.


Cryptographers--Great Britain--Biography.
Cryptography--History.
Ciphers--History.