In cryptography, the following uses transposition ciphers and the keyword is…
2018
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
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Show answer & explanation
Correct answer: B
Step 1: Identify the cipher type as Columnar Transposition using the keyword 'LAYER'. Step 2: Determine column order. Sort letters alphabetically: A, E, L, R, Y. This corresponds to indices 1, 3, 0, 4, 2.
Step 3: Prepare plaintext. Remove spaces from 'WELCOME TO NETWORK SECURITY !' to get 'WELCOMETONETWORKSECURITY!'. Step 4: Fill grid. Arrange the message into rows of length 5 (keyword length). Read columns vertically in the order determined by the sorted keyword.
Step 5: Concatenate column contents to form the final ciphertext.
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