Bifid Cipher solver calculator (encoder / decoder)

SolutionHelp

Solution

Solution provided by AtoZmath.com

1. ABCD efghi

2. hello world

Example

1. Bifid Cipher encoder

Text : ABCD efghi
Period / Length : 5
Alphabet25 : abcdefghiklmnopqrstuvwxyz
Coordinates Read Order : Row then Column

Solution:

The Bifid cipher is a 5x5 grid-based Polybius square cipher, that converts each letter into pair of coordinates (row, column), then rearrange them and convert them back to letters to get ciphertext

Alphabet = abcdefghiklmnopqrstuvwxyz

	1	2	3	4	5
1	a	b	c	d	e
2	f	g	h	i	k
3	l	m	n	o	p
4	q	r	s	t	u
5	v	w	x	y	z

The text is converted to its coordinates (row, column), then written vertically, in group of 5 columns

Plaintext	a	b	c	d	e	f	g	h	i
Text coordinates	11	12	13	14	15	21	22	23	24
Row	1	1	1	1	1	2	2	2	2
Col	1	2	3	4	5	1	2	3	4

Read each group in rows
11111,12345 | 2222,1234

Now divided up into pairs again and this pairs turned back to letters

Combined coordinates	11	11	11	23	45	22	22	12	34
Ciphertext	a	a	a	h	u	g	g	b	o

Plaintext	: abcdefghi
Period	: 5
Ciphertext	: aaahuggbo

2. Bifid Cipher encoder

Text : hello world
Period / Length : 5
Alphabet25 : abcdefghiklmnopqrstuvwxyz
Coordinates Read Order : Row then Column

Solution:

The Bifid cipher is a 5x5 grid-based Polybius square cipher, that converts each letter into pair of coordinates (row, column), then rearrange them and convert them back to letters to get ciphertext

Alphabet = abcdefghiklmnopqrstuvwxyz

	1	2	3	4	5
1	a	b	c	d	e
2	f	g	h	i	k
3	l	m	n	o	p
4	q	r	s	t	u
5	v	w	x	y	z

The text is converted to its coordinates (row, column), then written vertically, in group of 5 columns

Plaintext	h	e	l	l	o	w	o	r	l	d
Text coordinates	23	15	31	31	34	52	34	42	31	14
Row	2	1	3	3	3	5	3	4	3	1
Col	3	5	1	1	4	2	4	2	1	4

Read each group in rows
21333,35114 | 53431,24214

Now divided up into pairs again and this pairs turned back to letters

Combined coordinates	21	33	33	51	14	53	43	12	42	14
Ciphertext	f	n	n	v	d	x	s	b	r	d

Plaintext	: helloworld
Period	: 5
Ciphertext	: fnnvdxsbrd