Columnar transposition Cipher (encoder / decoder) Examples

1. Columnar transposition Cipher encoder

Text : ABCD efghi 12345
Key : key
Remove Special Characters (except a-z0-9) : True
Use X, if required : True
Write Read Order : Write by Rows, Read by Columns

Solution:

A columnar transposition cipher is a form of transposition cipher that involves writing the plaintext in row-by-row and then reading the ciphertext in column-by-column, based on a keyword's alphabetical order

Write the plaintext in row-by-row

k 2	e 1	y 3
a	b	c
d	e	f
g	h	i
1	2	3
4	5	_

The columns are sorted alphabetically, based on the keyword and the new table is

e 1	k 2	y 3
b	a	c
e	d	f
h	g	i
2	1	3
5	4	_

Read the ciphertext in column-by-column
beh25,adg14,cfi3X

Plaintext	: abcdefghi12345
Key	: key
Ciphertext	: beh25adg14cfi3X

2. Columnar transposition Cipher encoder

Text : hello world
Key : code
Remove Special Characters (except a-z0-9) : True
Use X, if required : True
Write Read Order : Write by Rows, Read by Columns

Solution:

Write the plaintext in row-by-row

c 1	o 4	d 2	e 3
h	e	l	l
o	w	o	r
l	d	_	_

The columns are sorted alphabetically, based on the keyword and the new table is

c 1	d 2	e 3	o 4
h	l	l	e
o	o	r	w
l	_	_	d

Read the ciphertext in column-by-column
hol,loX,lrX,ewd

Plaintext	: helloworld
Key	: code
Ciphertext	: holloXlrXewd

This material is intended as a summary. Use your textbook for detail explanation.
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1. Examples