goldf - written in most popular ciphers: caesar cipher, atbash, polybius square , affine cipher, baconian cipher, bifid cipher, rot13, permutation cipher

Caesar cipher

Caesar cipher, is one of the simplest and most widely known encryption techniques. The transformation can be represented by aligning two alphabets, the cipher alphabet is the plain alphabet rotated left or right by some number of positions.

When encrypting, a person looks up each letter of the message in the 'plain' line and writes down the corresponding letter in the 'cipher' line. Deciphering is done in reverse.
The encryption can also be represented using modular arithmetic by first transforming the letters into numbers, according to the scheme, A = 0, B = 1,..., Z = 25. Encryption of a letter x by a shift n can be described mathematically as

Plaintext: goldf

cipher variations:
hpmeg	iqnfh	jrogi	ksphj	ltqik
murjl	nvskm	owtln	pxumo	qyvnp
rzwoq	saxpr	tbyqs	uczrt	vdasu
webtv	xfcuw	ygdvx	zhewy	aifxz
bjgya	ckhzb	dliac	emjbd	fnkce

Decryption is performed similarly,

(There are different definitions for the modulo operation. In the above, the result is in the range 0...25. I.e., if x+n or x-n are not in the range 0...25, we have to subtract or add 26.)
Read more ...

Atbash Cipher

Atbash is an ancient encryption system created in the Middle East. It was originally used in the Hebrew language.
The Atbash cipher is a simple substitution cipher that relies on transposing all the letters in the alphabet such that the resulting alphabet is backwards.
The first letter is replaced with the last letter, the second with the second-last, and so on.
An example plaintext to ciphertext using Atbash:

Plain:	goldf
Cipher:	tlowu

Baconian Cipher

To encode a message, each letter of the plaintext is replaced by a group of five of the letters 'A' or 'B'. This replacement is done according to the alphabet of the Baconian cipher, shown below.

a   AAAAA   g    AABBA     m    ABABB   s    BAAAB     y    BABBA
b   AAAAB   h    AABBB     n    ABBAA   t    BAABA     z    BABBB
c   AAABA   i    ABAAA     o    ABBAB   u    BAABB 
d   AAABB   j    BBBAA     p    ABBBA   v    BBBAB
e   AABAA   k    ABAAB     q    ABBBB   w    BABAA
f   AABAB   l    ABABA     r    BAAAA   x    BABAB

Plain:	goldf
Cipher:	AABBA ABBAB ABABA AAABB AABAB

Affine Cipher
In the affine cipher the letters of an alphabet of size m are first mapped to the integers in the range 0..m - 1. It then uses modular arithmetic to transform the integer that each plaintext letter corresponds to into another integer that correspond to a ciphertext letter. The encryption function for a single letter is

where modulus m is the size of the alphabet and a and b are the key of the cipher. The value a must be chosen such that a and m are coprime.
Considering the specific case of encrypting messages in English (i.e. m = 26), there are a total of 286 non-trivial affine ciphers, not counting the 26 trivial Caesar ciphers. This number comes from the fact there are 12 numbers that are coprime with 26 that are less than 26 (these are the possible values of a). Each value of a can have 26 different addition shifts (the b value) ; therefore, there are 12*26 or 312 possible keys.
Plaintext: goldf

cipher variations:

hpmeg

trikq

fteqa

rvawk

dxwcu

pzsie

ndkuy

zfgai

lhcgs

xjymc

jlusm

vnqyw

iqnfh

usjlr

gufrb

swbxl

eyxdv

qatjf

oelvz

aghbj

midht

ykznd

kmvtn

worzx

jrogi

vtkms

hvgsc

txcym

fzyew

rbukg

pfmwa

bhick

njeiu

zlaoe

lnwuo

xpsay

ksphj

wulnt

iwhtd

uydzn

gazfx

scvlh

qgnxb

cijdl

okfjv

ambpf

moxvp

yqtbz

ltqik

xvmou

jxiue

vzeao

hbagy

tdwmi

rhoyc

djkem

plgkw

bncqg

npywq

zruca

murjl

ywnpv

kyjvf

wafbp

icbhz

uexnj

sipzd

eklfn

qmhlx

codrh

oqzxr

asvdb

nvskm

zxoqw

lzkwg

xbgcq

jdcia

vfyok

tjqae

flmgo

rnimy

dpesi

prays

btwec

owtln

ayprx

malxh

ychdr

kedjb

wgzpl

ukrbf

gmnhp

sojnz

eqftj

qsbzt

cuxfd

pxumo

bzqsy

nbmyi

zdies

lfekc

xhaqm

vlscg

hnoiq

tpkoa

frguk

rtcau

dvyge

qyvnp

cartz

ocnzj

aejft

mgfld

yibrn

wmtdh

iopjr

uqlpb

gshvl

sudbv

ewzhf

rzwoq

dbsua

pdoak

bfkgu

nhgme

zjcso

xnuei

jpqks

vrmqc

htiwm

tvecw

fxaig

saxpr

ectvb

qepbl

cglhv

oihnf

akdtp

yovfj

kqrlt

wsnrd

iujxn

uwfdx

gybjh

tbyqs

fduwc

rfqcm

dhmiw

pjiog

bleuq

zpwgk

lrsmu

xtose

jvkyo

vxgey

hzcki

uczrt

gevxd

sgrdn

einjx

qkjph

cmfvr

aqxhl

mstnv

yuptf

kwlzp

wyhfz

iadlj

vdasu

hfwye

thseo

fjoky

rlkqi

dngws

bryim

ntuow

zvqug

lxmaq

xziga

jbemk

webtv

igxzf

uitfp

gkplz

smlrj

eohxt

cszjn

ouvpx

awrvh

mynbr

yajhb

kcfnl

xfcuw

jhyag

vjugq

hlqma

tnmsk

fpiyu

dtako

pvwqy

bxswi

nzocs

zbkic

ldgom

ygdvx

kizbh

wkvhr

imrnb

uontl

gqjzv

eublp

qwxrz

cytxj

oapdt

acljd

mehpn

zhewy

ljaci

xlwis

jnsoc

vpoum

hrkaw

fvcmq

rxysa

dzuyk

pbqeu

bdmke

nfiqo

aifxz

mkbdj

ymxjt

kotpd

wqpvn

islbx

gwdnr

syztb

eavzl

qcrfv

cenlf

ogjrp

bjgya

nlcek

znyku

lpuqe

xrqwo

jtmcy

hxeos

tzauc

fbwam

rdsgw

dfomg

phksq

ckhzb

omdfl

aozlv

mqvrf

ysrxp

kundz

iyfpt

uabvd

gcxbn

sethx

egpnh

qiltr

dliac

pnegm

bpamw

nrwsg

ztsyq

lvoea

jzgqu

vbcwe

hdyco

tfuiy

fhqoi

rjmus

emjbd

qofhn

cqbnx

osxth

autzr

mwpfb

kahrv

wcdxf

iezdp

ugvjz

girpj

sknvt

fnkce

rpgio

drcoy

ptyui

bvuas

nxqgc

lbisw

xdeyg

jfaeq

vhwka

hjsqk

tlowu

goldf

sqhjp

esdpz

quzvj

cwvbt

oyrhd

mcjtx

yefzh

kgbfr

wixlb

iktrl

umpxv

The decryption function is

where a - 1 is the modular multiplicative inverse of a modulo m. I.e., it satisfies the equation

The multiplicative inverse of a only exists if a and m are coprime. Hence without the restriction on a decryption might not be possible. It can be shown as follows that decryption function is the inverse of the encryption function,

ROT13 Cipher
Applying ROT13 to a piece of text merely requires examining its alphabetic characters and replacing each one by the letter 13 places further along in the alphabet, wrapping back to the beginning if necessary. A becomes N, B becomes O, and so on up to M, which becomes Z, then the sequence continues at the beginning of the alphabet: N becomes A, O becomes B, and so on to Z, which becomes M. Only those letters which occur in the English alphabet are affected; numbers, symbols, whitespace, and all other characters are left unchanged. Because there are 26 letters in the English alphabet and 26 = 2 * 13, the ROT13 function is its own inverse:

ROT13(ROT13(x)) = x for any basic Latin-alphabet text x

An example plaintext to ciphertext using ROT13:

Plain:	goldf
Cipher:	tbyqs

Polybius Square

A Polybius Square is a table that allows someone to translate letters into numbers. To give a small level of encryption, this table can be randomized and shared with the recipient. In order to fit the 26 letters of the alphabet into the 25 spots created by the table, the letters i and j are usually combined.

	1	2	3	4	5
1	A	B	C	D	E
2	F	G	H	I/J	K
3	L	M	N	O	P
4	Q	R	S	T	U
5	V	W	X	Y	Z

Basic Form:

Plain:	goldf
Cipher:	2243134112

Extended Methods:
Method #1

Plaintext: goldf

method variations:
mtqil	ryvoq	wdatv	bifya

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:

g o l d f 
2 4 1 4 1 
2 3 3 1 2

They are then read out in rows:
2414123312
Then divided up into pairs again, and the pairs turned back into letters using the square:

Plain:	goldf
Cipher:	rqfnf

Read more ...
Method #3

Plaintext: goldf

method variations:
rcsag	csagr	sagrc
agrcs	grcsa

Read more ...[RUS] , [EN]

Permutation Cipher
In classical cryptography, a permutation cipher is a transposition cipher in which the key is a permutation. To apply a cipher, a random permutation of size E is generated (the larger the value of E the more secure the cipher). The plaintext is then broken into segments of size E and the letters within that segment are permuted according to this key.
In theory, any transposition cipher can be viewed as a permutation cipher where E is equal to the length of the plaintext; this is too cumbersome a generalisation to use in actual practice, however.
The idea behind a permutation cipher is to keep the plaintext characters unchanged, butalter their positions by rearrangement using a permutation
This cipher is defined as:
Let m be a positive integer, and K consist of all permutations of {1,...,m}
For a key (permutation)

, define:
The encryption function

The decryption function

A small example, assuming m = 6, and the key is the permutation

The first row is the value of i, and the second row is the corresponding value of

(i)
The inverse permutation,

is constructed by interchanging the two rows, andrearranging the columns so that the first row is in increasing order, Therefore,

is:

Total variation formula:

e = 2,718281828 , n - plaintext length

Plaintext: goldf

all 120 cipher variations:

goldf

golfd

godlf

godfl

gofdl

gofld

glodf

glofd

gldof

gldfo

glfdo

glfod

gdlof

gdlfo

gdolf

gdofl

gdfol

gdflo

gfldo

gflod

gfdlo

gfdol

gfodl

gfold

ogldf

oglfd

ogdlf

ogdfl

ogfdl

ogfld

olgdf

olgfd

oldgf

oldfg

olfdg

olfgd

odlgf

odlfg

odglf

odgfl

odfgl

odflg

ofldg

oflgd

ofdlg

ofdgl

ofgdl

ofgld

logdf

logfd

lodgf

lodfg

lofdg

lofgd

lgodf

lgofd

lgdof

lgdfo

lgfdo

lgfod

ldgof

ldgfo

ldogf

ldofg

ldfog

ldfgo

lfgdo

lfgod

lfdgo

lfdog

lfodg

lfogd

dolgf

dolfg

doglf

dogfl

dofgl

doflg

dlogf

dlofg

dlgof

dlgfo

dlfgo

dlfog

dglof

dglfo

dgolf

dgofl

dgfol

dgflo

dflgo

dflog

dfglo

dfgol

dfogl

dfolg

foldg

folgd

fodlg

fodgl

fogdl

fogld

flodg

flogd

fldog

fldgo

flgdo

flgod

fdlog

fdlgo

fdolg

fdogl

fdgol

fdglo

fgldo

fglod

fgdlo

fgdol

fgodl

fgold