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| '''Alexander d'Agapeyeff''' wrote an elementary book on cryptography in |
'''Alexander d'Agapeyeff''' wrote an elementary book on cryptography in ], entitled ''Codes and Ciphers''. | ||
| ⚫ | In the first edition, he included a challenge cipher. Nobody solved solved it and he embarrassingly admitted later that he no longer knew how he had encrypted it. It was left out of the second and later editions. Some think it was botched, but many think it could still be solved. It has lots of "phenomena" noted, but nothing close to a crack. | ||
| In the first edition, he included a challenge cipher. | |||
| '''Nobody's solved it''', and he embarrassedly admitted later that he no longer knew how he'd encrypted it. | |||
| ⚫ | It was left out of the second and later editions. Some think it was botched, |
||
| The "ciphertext" is: | |||
| Here is the cipher: | |||
| <blockquote> | |||
| ---- | |||
| <tt> | <tt> | ||
| 75628 28591 62916 48164 91748 58464 74748 28483 81638 18174<br/> | 75628 28591 62916 48164 91748 58464 74748 28483 81638 18174<br/> | ||
| Line 15: | Line 12: | ||
| 71658 36264 74818 28462 82649 18193 65626 48484 91838 57491<br/> | 71658 36264 74818 28462 82649 18193 65626 48484 91838 57491<br/> | ||
| 81657 27483 83858 28364 62726 26562 83759 27263 82827 27283<br/> | 81657 27483 83858 28364 62726 26562 83759 27263 82827 27283<br/> | ||
| 82858 47582 81837 28462 82837 58164 75748 58162 92000<br/> | 82858 47582 81837 28462 82837 58164 75748 58162 92000 <br/> | ||
| </tt> | </tt> | ||
| </blockquote> | |||
| ---- | |||
| ==External links== | |||
| * | |||
| Good Luck if you try to solve it ! | |||
| ] | |||
| ] | |||
| ] | ] | ||
Revision as of 20:26, 2 December 2005
Alexander d'Agapeyeff wrote an elementary book on cryptography in 1939, entitled Codes and Ciphers. In the first edition, he included a challenge cipher. Nobody solved solved it and he embarrassingly admitted later that he no longer knew how he had encrypted it. It was left out of the second and later editions. Some think it was botched, but many think it could still be solved. It has lots of "phenomena" noted, but nothing close to a crack.
The "ciphertext" is:
75628 28591 62916 48164 91748 58464 74748 28483 81638 18174
74826 26475 83828 49175 74658 37575 75936 36565 81638 17585
75756 46282 92857 46382 75748 38165 81848 56485 64858 56382
72628 36281 81728 16463 75828 16483 63828 58163 63630 47481
91918 46385 84656 48565 62946 26285 91859 17491 72756 46575
71658 36264 74818 28462 82649 18193 65626 48484 91838 57491
81657 27483 83858 28364 62726 26562 83759 27263 82827 27283
82858 47582 81837 28462 82837 58164 75748 58162 92000