easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

marzano

gelotoscopy

cartage

compensatory

lubim

untempting

cinnamomic

impulsively

bambini

unconcluding

pardeesville

respires

concubinarian

natatis

hulin

sarcotherapeutics

chinchy

unsphering


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: shawen
cipher variations:
tibxfo ujcygp vkdzhq wleair xmfbjs
yngckt zohdlu apiemv bqjfnw crkgox
dslhpy etmiqz funjra gvoksb hwpltc
ixqmud jyrnve kzsowf latpxg mbuqyh
ncvrzi odwsaj pextbk qfyucl rgzvdm

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: shawen
Cipher: hszdvm

Read more ...

 

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: shawen
Cipher: BAAAB AABBB AAAAA BABAA AABAA ABBAA

Read more ...

 

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: shawen
cipher variations:
tibxfo
dwbpno
nkbhvo
xybzdo
hmbrlo
rabjto
lcbtjo
vqblro
febdzo
psbvho
zgbnpo
jubfxo
ujcygp
excqop
olciwp
yzcaep
incsmp
sbckup
mdcukp
wrcmsp
gfceap
qtcwip
ahcoqp
kvcgyp
vkdzhq
fydrpq
pmdjxq
zadbfq
jodtnq
tcdlvq
nedvlq
xsdntq
hgdfbq
rudxjq
bidprq
lwdhzq
wleair
gzesqr
qnekyr
abecgr
kpeuor
udemwr
ofewmr
yteour
ihegcr
sveykr
cjeqsr
mxeiar
xmfbjs
haftrs
roflzs
bcfdhs
lqfvps
vefnxs
pgfxns
zufpvs
jifhds
twfzls
dkfrts
nyfjbs
yngckt
ibgust
spgmat
cdgeit
mrgwqt
wfgoyt
qhgyot
avgqwt
kjgiet
uxgamt
elgsut
ozgkct
zohdlu
jchvtu
tqhnbu
dehfju
nshxru
xghpzu
rihzpu
bwhrxu
lkhjfu
vyhbnu
fmhtvu
pahldu
apiemv
kdiwuv
uriocv
efigkv
otiysv
yhiqav
sjiaqv
cxisyv
mlikgv
wzicov
gniuwv
qbimev
bqjfnw
lejxvw
vsjpdw
fgjhlw
pujztw
zijrbw
tkjbrw
dyjtzw
nmjlhw
xajdpw
hojvxw
rcjnfw
crkgox
mfkywx
wtkqex
ghkimx
qvkaux
ajkscx
ulkcsx
ezkuax
onkmix
ybkeqx
ipkwyx
sdkogx
dslhpy
nglzxy
xulrfy
hiljny
rwlbvy
bkltdy
vmldty
falvby
polnjy
zclfry
jqlxzy
telphy
etmiqz
ohmayz
yvmsgz
ijmkoz
sxmcwz
clmuez
wnmeuz
gbmwcz
qpmokz
admgsz
krmyaz
ufmqiz
funjra
pinbza
zwntha
jknlpa
tyndxa
dmnvfa
xonfva
hcnxda
rqnpla
benhta
lsnzba
vgnrja
gvoksb
qjocab
axouib
klomqb
uzoeyb
enowgb
ypogwb
idoyeb
sroqmb
cfoiub
mtoacb
whoskb
hwpltc
rkpdbc
bypvjc
lmpnrc
vapfzc
fopxhc
zqphxc
jepzfc
tsprnc
dgpjvc
nupbdc
xiptlc
ixqmud
slqecd
czqwkd
mnqosd
wbqgad
gpqyid
arqiyd
kfqagd
utqsod
ehqkwd
ovqced
yjqumd
jyrnve
tmrfde
darxle
norpte
xcrhbe
hqrzje
bsrjze
lgrbhe
vurtpe
firlxe
pwrdfe
zkrvne
kzsowf
unsgef
ebsymf
opsquf
ydsicf
irsakf
ctskaf
mhscif
wvsuqf
gjsmyf
qxsegf
alswof
latpxg
vothfg
fctzng
pqtrvg
zetjdg
jstblg
dutlbg
nitdjg
xwtvrg
hktnzg
rytfhg
bmtxpg
mbuqyh
wpuigh
gduaoh
qruswh
afukeh
ktucmh
evumch
ojuekh
yxuwsh
iluoah
szugih
cnuyqh
ncvrzi
xqvjhi
hevbpi
rsvtxi
bgvlfi
luvdni
fwvndi
pkvfli
zyvxti
jmvpbi
tavhji
dovzri
odwsaj
yrwkij
ifwcqj
stwuyj
chwmgj
mvweoj
gxwoej
qlwgmj
azwyuj
knwqcj
ubwikj
epwasj
pextbk
zsxljk
jgxdrk
tuxvzk
dixnhk
nwxfpk
hyxpfk
rmxhnk
baxzvk
loxrdk
vcxjlk
fqxbtk
qfyucl
atymkl
khyesl
uvywal
ejyoil
oxygql
izyqgl
snyiol
cbyawl
mpysel
wdykml
grycul
rgzvdm
buznlm
lizftm
vwzxbm
fkzpjm
pyzhrm
jazrhm
tozjpm
dczbxm
nqztfm
xezlnm
hszdvm
shawen
cvaomn
mjagun
wxaycn
glaqkn
qzaisn
kbasin
upakqn
edacyn
oraugn
yfamon
itaewn

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,

Read more ...

 

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: shawen
Cipher: funjra

Read more ...

 

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: shawen
Cipher: 343211255133

Extended Methods:
Method #1

Plaintext: shawen
method variations:
xnfbkscslgpxhxqmucncvrzh

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath: 
s h a w e n 
3 3 1 2 5 3 
4 2 1 5 1 3
They are then read out in rows:
331253421513
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: shawen
Cipher: nfpivl

Read more ...
Method #3

Plaintext: shawen
method variations:
obfzln bfzlno fzlnob
zlnobf lnobfz nobfzl

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: shawen
all 720 cipher variations:
shawen
shawne
shaewn
shaenw
shanew
shanwe
shwaen
shwane
shwean
shwena
shwnea
shwnae
shewan
shewna
sheawn
sheanw
shenaw
shenwa
shnwea
shnwae
shnewa
shneaw
shnaew
shnawe
sahwen
sahwne
sahewn
sahenw
sahnew
sahnwe
sawhen
sawhne
sawehn
sawenh
sawneh
sawnhe
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saehwn
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seawhn
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sewanh
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hsawen
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hsewan
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nswhae
nsewah
nsewha
nseawh
nseahw
nsehaw
nsehwa
nshwea
nshwae
nshewa
nsheaw
nshaew
nshawe

Read more ...[1] , [2] , [3]


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