Question Bank - Computer Networks

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In cryptography, the following uses transposition ciphers and the keyword is LAYER. Encrypt the following message. (Spaces are omitted during encryption)WELCOME TO NETWORK SECURITY !

A.
WMEKREETSILTWETCOOCYONRU!
B.
EETSICOOCYWMEKRONRU!LTWET
C.
LTWETONRU!WMEKRCOOCYEETSI
D.
ONRU!COOCYLTWETEETSIWMEKR

Solution:

transposition ciphers conceptWrite the plain text in rows of width l and read it off by columns. Take the columns in an order defined by a key. [If you take the columns in their natural order”without using a key”, then the procedure amounts to a path transposition. The Scytale corresponds to such a columnar transposition with a trivial key.]Explanation:l = 5;KeywordL A Y E RKey 3 1 5 2 4Plaintext = WELCOMETONETWORKSECURITY!now read it column-wise based on the key, So generated ciphertext isEETSI C00CY WMEKR ONRU! LTWET.The correct answer is option 2

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