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D'Agapeyeff cipher.
1

%I #15 Oct 11 2019 11:15:07

%S 75628,28591,62916,48164,91748,58464,74748,28483,81638,18174,74826,

%T 26475,83828,49175,74658,37575,75936,36565,81638,17585,75756,46282,

%U 92857,46382,75748,38165,81848,56485,64858,56382,72628,36281,81728

%N D'Agapeyeff cipher.

%C The D'Agapeyeff cipher is an as-yet unbroken cipher that appears in the first edition of Codes and Ciphers, an elementary book on cryptography published by the Russian-born English cartographer Alexander D'Agapeyeff in 1939.

%H Paolo P. Lava and Giorgio Balzarotti, Dec 05 2007, <a href="/A135209/b135209.txt">Table of n, a(n) for n = 0..78</a>

%H American Cryptogram Association, <a href="https://web.archive.org/web/20171210145225/http://www.und.nodak.edu/org/crypto/crypto/general.crypt.info/dagapeyeff/dagapeyeff-challenge-1939.txt">Discussion of possible causes of failure to solve D'Agapeyeff cipher</a> [Via Internet Archive Wayback Machine]

%H Robert Matthews, <a href="http://robertmatthews.org/index.php/dagapeyeff/">Notes on the D’Agapeyeff Cipher</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/D%27Agapeyeff_cipher">D'Agapeyeff cipher</a>

%Y Cf. A101110, A101111, A101112.

%K fini,full,nonn

%O 0,1

%A _Paolo P. Lava_ and _Giorgio Balzarotti_, Dec 05 2007