Multiplicative Cipher | Decimation Cipher solver calculator (encoder / decoder)

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Solution

Solution provided by AtoZmath.com

1. ABCD efghi

2. hello world

Example

1. Multiplicative Cipher encoder

Text : ABCD efghi
Multiplication Key : 3
Alphabet : abcdefghijklmnopqrstuvwxyz

Solution:

A multiplicative cipher encrypts a message by multiplying each letter's numerical value (0-25) by a fixed key (which is coprime to 26) and the corresponding letter is substituted.

Alphabet = abcdefghijklmnopqrstuvwxyz

Letter	a	b	c	d	e	f	g	h	i	j	k	l	m	n	o	p	q	r	s	t	u	v	w	x	y	z
Number	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25

Each letter is shifted down based on the key letter

Plaintext	A	B	C	D	e	f	g	h	i
Text Value (2)	0	1	2	3	4	5	6	7	8
((2) * 3) Mod 26	0	3	6	9	12	15	18	21	24
Ciphertext	A	D	G	J	m	p	s	v	y

Plaintext	: ABCD efghi
Multiplication Key	: 3
Ciphertext	: ADGJ mpsvy

2. Multiplicative Cipher encoder

Text : hello world
Multiplication Key : 3
Alphabet : abcdefghijklmnopqrstuvwxyz

Solution:

A multiplicative cipher encrypts a message by multiplying each letter's numerical value (0-25) by a fixed key (which is coprime to 26) and the corresponding letter is substituted.

Alphabet = abcdefghijklmnopqrstuvwxyz

Letter	a	b	c	d	e	f	g	h	i	j	k	l	m	n	o	p	q	r	s	t	u	v	w	x	y	z
Number	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25

Each letter is shifted down based on the key letter

Plaintext	h	e	l	l	o	w	o	r	l	d
Text Value (2)	7	4	11	11	14	22	14	17	11	3
((2) * 3) Mod 26	21	12	33=7	33=7	42=16	66=14	42=16	51=25	33=7	9
Ciphertext	v	m	h	h	q	o	q	z	h	j

Plaintext	: hello world
Multiplication Key	: 3
Ciphertext	: vmhhq oqzhj