Two Chinese cipher telegrams from 1916 presented in "Chinese Cryptography: 1871-1945" are now solved by Daniel Bourdeau.
The one is a telegram to Sun Yat-sen, for which he identified the code condenser (kind of superencryption) by brute force attack after cleverly narrowing down the search scope.
The second was not technically "unsolved" because the decryption is attached, but the encryption scheme has not been known. Bourdeau found it is a three-kana code. It still remains to be found out how the three-kana code groups are mapped to character numbers in a codebook.
See "Solution of Two Chinese Cipher Telegrams Archived in Japan (1916)" and Bourdeau's github pages quoted therein.
No comments:
Post a Comment