easy ciphers

Easy Ciphers Tools:
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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: lawlis
cipher variations:
mbxmjt ncynku odzolv peapmw qfbqnx
rgcroy shdspz tietqa ujfurb vkgvsc
wlhwtd xmixue ynjyvf zokzwg aplaxh
bqmbyi crnczj dsodak etpebl fuqfcm
gvrgdn hwsheo ixtifp jyujgq kzvkhr

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: lawlis
Cipher: ozdorh

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: lawlis
Cipher: ABABA AAAAA BABAA ABABA ABAAA BAAAB

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: lawlis
cipher variations:
mbxmjt
ibpizd
ebhepn
abzafx
wbrwvh
sbjslr
kbtkrl
gblghv
cbdcxf
ybvynp
ubnudz
qbfqtj
ncynku
jcqjae
fcifqo
bcabgy
xcsxwi
tcktms
lculsm
hcmhiw
dcedyg
zcwzoq
vcovea
rcgruk
odzolv
kdrkbf
gdjgrp
cdbchz
ydtyxj
udlunt
mdvmtn
idnijx
edfezh
adxapr
wdpwfb
sdhsvl
peapmw
leslcg
hekhsq
decdia
zeuzyk
vemvou
newnuo
jeojky
fegfai
beybqs
xeqxgc
teitwm
qfbqnx
mftmdh
iflitr
efdejb
afvazl
wfnwpv
ofxovp
kfpklz
gfhgbj
cfzcrt
yfryhd
ufjuxn
rgcroy
ngunei
jgmjus
fgefkc
bgwbam
xgoxqw
pgypwq
lgqlma
hgihck
dgadsu
zgszie
vgkvyo
shdspz
ohvofj
khnkvt
ghfgld
chxcbn
yhpyrx
qhzqxr
mhrmnb
ihjidl
ehbetv
ahtajf
whlwzp
tietqa
piwpgk
liolwu
highme
diydco
ziqzsy
riarys
nisnoc
jikjem
ficfuw
biubkg
ximxaq
ujfurb
qjxqhl
mjpmxv
ijhinf
ejzedp
ajratz
sjbszt
ojtopd
kjlkfn
gjdgvx
cjvclh
yjnybr
vkgvsc
rkyrim
nkqnyw
jkijog
fkafeq
bksbua
tkctau
pkupqe
lkmlgo
hkehwy
dkwdmi
zkozcs
wlhwtd
slzsjn
olrozx
kljkph
glbgfr
cltcvb
uldubv
qlvqrf
mlnmhp
ilfixz
elxenj
alpadt
xmixue
tmatko
pmspay
lmklqi
hmchgs
dmudwc
vmevcw
rmwrsg
nmoniq
jmgjya
fmyfok
bmqbeu
ynjyvf
unbulp
qntqbz
mnlmrj
indiht
envexd
wnfwdx
snxsth
onpojr
knhkzb
gnzgpl
cnrcfv
zokzwg
vocvmq
rourca
nomnsk
joejiu
fowfye
xogxey
toytui
poqpks
loilac
hoahqm
dosdgw
aplaxh
wpdwnr
spvsdb
opnotl
kpfkjv
gpxgzf
yphyfz
upzuvj
qprqlt
mpjmbd
ipbirn
eptehx
bqmbyi
xqexos
tqwtec
pqopum
lqglkw
hqyhag
zqizga
vqavwk
rqsrmu
nqknce
jqcjso
fqufiy
crnczj
yrfypt
urxufd
qrpqvn
mrhmlx
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wrbwxl
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rsqrwo
nsinmy
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xscxym
tsutow
psmpeg
lseluq
hswhka
etpebl
atharv
wtzwhf
strsxp
otjonz
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ctlcjd
ytdyzn
utvupx
qtnqfh
mtfmvr
itxilb
fuqfcm
buibsw
xuaxig
tustyq
pukpoa
luclek
dumdke
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vuwvqy
ruorgi
nugnws
juyjmc
gvrgdn
cvjctx
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fwofmg
bwgbcq
xwyxsa
twqtik
pwipyu
lwaloe
ixtifp
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wxvwbt
sxnsrd
oxfohn
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cxhcdr
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qxjqzv
mxbmpf
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fymfwa
byebmk
xywxcu
tyotse
pygpio
hyqhoi
dyides
zyazuc
vysvkm
rykraw
nycnqg
kzvkhr
gzngxb
czfcnl
yzxydv
uzputf
qzhqjp
izripj
ezjeft
azbavd
wztwln
szlsbx
ozdorh
lawlis
haohyc
dagdom
zayzew
vaqvug
rairkq
jasjqk
fakfgu
bacbwe
xauxmo
tamtcy
paepsi

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: lawlis
Cipher: ynjyvf

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: lawlis
Cipher: 131125134234

Extended Methods:
Method #1

Plaintext: lawlis
method variations:
qfbqoxvlgvtcaqmayhfvrfdn

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
l a w l i s 
1 1 2 1 4 3 
3 1 5 3 2 4 
They are then read out in rows:
112143315324
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: lawlis
Cipher: abocpr

Read more ...
Method #3

Plaintext: lawlis
method variations:
cfesmd fesmdc esmdcf
smdcfe mdcfes dcfesm

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: lawlis
all 720 cipher variations:
lawlis
lawlsi
lawils
lawisl
lawsil
lawsli
lalwis
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lalsiw
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slawil
slawli

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


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