UGC-NET | UGC NET CS 2015 Jun – III | Question 28

A message “COMPUTERNETWORK” encrypted (ignore quotes) using columnar transposition cipher with a key “LAYER”. The encrypted message is :
(A) CTTOEWMROPNRUEK
(B) MROUEKCTTPNROEW
(C) OEWPNRCTTUEKMRO
(D) UEKPNRMROOEWCTT


Answer: (C)

Explanation: According to columnar transposition cipher with key LAYER:
5 element in key so there will be 5 column in every row and write down the order in key alphabetically.
L A Y E R
3 1 5 2 4

C O M P U
T E R N E
T W O R K
Now encode it in column wise manner from column 1 to column 5 according to order defined by key.
The Encrypted message will be OEWPNRCTTUEKMRO.
For more information on columnar transposition cipher Refer:Columnar Transposition Cipher
Option (C) is correct.


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