Question

1. Using the passphrase WONDER, encrypt the message SCHOOL IS IN DISTANCE LEARNING MODE using columnar transposition. Give the ciphertext.

Answer 1

Answer:

For columnar transposition we arrange plain text in columnar representation according to the passphrase,

we also number the column according to the aplphabetical order

W(6)	O(4)	N(3)	D(1)	E(2)	R(5)
S	C	H	O	O	L
I	S	I	N	D	I
S	T	A	N	C	E
L	E	A	R	N	I
N	G	M	O	D	E

Now writing the columns in ascending order,

first we write column D(1) = ONNRO,

then column E(2)=ODCND,

then column N(3)=HIAAM,

then column O(4)=CSTEG,

then column R(5)= LIEIE,

then column W(6)=SISLN.

Hence the cipher text = ONNROODCNDHIAAMCSTEGLIEIESISLN.