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| Is there a name for this?; A simple transposition cipher | |
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| Tweet Topic Started: Jan 17 2014, 09:44 PM (358 Views) | |
| fiziwig | Jan 17 2014, 09:44 PM Post #1 |
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Elite member
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I'm assuming this has been done before, but I can't seem to find a name for it among my books. Just to make it easy, I'll use a 5 x 5 grid for the columnar transposition, BUT, I put an additional key down the left side:
Next, I write the message "NOW IS THE TIME OR ALL GOOD MEN" into the grid, filling the rows in the order given by the row key:
Now read out by columns in key order like an ordinary columnar:
There must be some name for this type of transposition. Does anybody know what it is? Edited by fiziwig, Jan 17 2014, 09:44 PM.
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| Grip2000 | Jan 17 2014, 11:06 PM Post #2 |
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no member
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COMB : Irregular "toothed" pattern used as cage in transposition systems consisting of a series of lines or columns (of small squares) of unequal length. COMB TRANSPOSITION : Transposition using a "comb" in place of the normal cage. http://www.codesandciphers.org.uk/documents/cryptdict/page20.htm http://www.nsa.gov/public_info/_files/cryptologic_histories/cryptology_of_gis.pdf (Page 11) http://s13.zetaboards.com/Crypto/single/?p=8004725&t=6802232 |
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| fiziwig | Jan 18 2014, 02:31 AM Post #3 |
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Elite member
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All rows and columns are exactly the same length. So that's not it. It's just that in addition to taking out the columns in key order, you fill the rows in key order too. |
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| novice | Jan 18 2014, 09:10 AM Post #4 |
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Super member
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Your cipher is a NIHILIST TRANSPOSITION. You will find it listed at the website of the American Cryptogram Association here |
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| fiziwig | Jan 18 2014, 10:32 PM Post #5 |
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Elite member
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Thank you! I knew I'd seen it somewhere before. I just couldn't remember. |
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