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ngosrani
Posts: 31
Posted 19:07 Aug 28, 2015 |

Can anyone please explain me how to solve Homework-2 7th question which is on Columnar transposition cipher.

schacha
Posts: 8
Posted 20:14 Aug 28, 2015 |
Hey .. There are 90 alphabets ( 5*18 = 90 ) .. So, you have to check all the multiple of 90 if they form a rectangle and give a favorable answer that has word computer in that line.. While executing that you get 15*6=90 as shown in attachment..and there is a padding of extra one alphabet r at the end. I solved it that way am not sure though if its the correct answer.
Attachments:
afetiso
Posts: 84
Posted 20:20 Aug 28, 2015 |

I did the same, start from 4 columns, than 5 than 6 - works.

dguhath
Posts: 61
Posted 22:29 Aug 28, 2015 |

It's trial and error.

Dr. Guo said there won't be a trial and error question in the exam. The exam will have a keyword to solve the problem if at all.