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Is there a name for this?; A simple transposition cipher
Topic Started: Jan 17 2014, 09:44 PM (358 Views)
fiziwig
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:

Code:
 
[space][space]5[space]1[space]3[space]4[space]2[space]<-[space]column[space]key
3[space]_[space]_[space]_[space]_[space]_
5[space]_[space]_[space]_[space]_[space]_
2[space]_[space]_[space]_[space]_[space]_
1[space]_[space]_[space]_[space]_[space]_
4[space]_[space]_[space]_[space]_[space]_
|
|
+<-[space]row[space]key


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:

Code:
 
[space][space]5[space]1[space]3[space]4[space]2
3[space]_[space]_[space]_[space]_[space]_
5[space]_[space]_[space]_[space]_[space]_
2[space]_[space]_[space]_[space]_[space]_
1[space]N[space]O[space]W[space]I[space]S
4[space]_[space]_[space]_[space]_[space]_

[space][space]5[space]1[space]3[space]4[space]2
3[space]_[space]_[space]_[space]_[space]_
5[space]_[space]_[space]_[space]_[space]_
2[space]T[space]H[space]E[space]T[space]I
1[space]N[space]O[space]W[space]I[space]S
4[space]_[space]_[space]_[space]_[space]_

etc.,[space]until:

[space][space]5[space]1[space]3[space]4[space]2
3[space]M[space]E[space]F[space]O[space]R
5[space]O[space]D[space]M[space]E[space]N
2[space]T[space]H[space]E[space]T[space]I
1[space]N[space]O[space]W[space]I[space]S
4[space]A[space]L[space]L[space]G[space]O


Now read out by columns in key order like an ordinary columnar:

Code:
 
EDHOL[space]RNISO[space]FMEWL[space]OETIG[space]MOTNA


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
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
Elite member
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Grip2000
Jan 17 2014, 11:06 PM
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
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
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
Elite member
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novice
Jan 18 2014, 09:10 AM
Your cipher is a NIHILIST TRANSPOSITION. You will find it listed at the website of the American Cryptogram Association here
Thank you!

I knew I'd seen it somewhere before. I just couldn't remember.
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