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Code of the Week / Re: Double Columnar Transposition
« Last post by george4096 on December 02, 2013, 02:15:45 PM »Hi Phil
I am new to the forum and also like double transpositions. A couple of questions:
1) In the same key used for both transpositions.
2) Could you give a general idea of the key lengths. Are they less than 10, or around 10, 15, 20, or more.
I have developed a program for that, but this would take too much time to test 25 x 25 = 625 possible options for key lengths. Also, when I have an idea about the approximate key length, then based on the cipher text lengths, I can evaluate if at all there are chances of success.
Also, did you take the quotes accurately word by word/letter by letter, or should we expect deviations from the "official" known quotes. I am asking because a known plain text attach would also be an option, which wont work if the text is not exactly as expected.
Regards
George
I am new to the forum and also like double transpositions. A couple of questions:
1) In the same key used for both transpositions.
2) Could you give a general idea of the key lengths. Are they less than 10, or around 10, 15, 20, or more.
I have developed a program for that, but this would take too much time to test 25 x 25 = 625 possible options for key lengths. Also, when I have an idea about the approximate key length, then based on the cipher text lengths, I can evaluate if at all there are chances of success.
Also, did you take the quotes accurately word by word/letter by letter, or should we expect deviations from the "official" known quotes. I am asking because a known plain text attach would also be an option, which wont work if the text is not exactly as expected.
Regards
George