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: cutlas
cipher variations:
dvumbt ewvncu fxwodv gyxpew hzyqfx
iazrgy jbashz kcbtia ldcujb medvkc
nfewld ogfxme phgynf qihzog rjiaph
skjbqi tlkcrj umldsk vnmetl wonfum
xpogvn yqphwo zrqixp asrjyq btskzr

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: cutlas
Cipher: xfgozh

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: cutlas
Cipher: AAABA BAABB BAABA ABABA AAAAA 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: cutlas
cipher variations:
dvumbt
hjgibd
lxsebn
pleabx
tzqwbh
xncsbr
fpakbl
jdmgbv
nrycbf
rfkybp
vtwubz
zhiqbj
ewvncu
ikhjce
mytfco
qmfbcy
uarxci
yodtcs
gqblcm
kenhcw
oszdcg
sglzcq
wuxvca
aijrck
fxwodv
jlikdf
nzugdp
rngcdz
vbsydj
zpeudt
hrcmdn
lfoidx
ptaedh
thmadr
xvywdb
bjksdl
gyxpew
kmjleg
oavheq
sohdea
wctzek
aqfveu
isdneo
mgpjey
qubfei
uinbes
ywzxec
ckltem
hzyqfx
lnkmfh
pbwifr
tpiefb
xduafl
brgwfv
jteofp
nhqkfz
rvcgfj
vjocft
zxayfd
dlmufn
iazrgy
molngi
qcxjgs
uqjfgc
yevbgm
cshxgw
kufpgq
oirlga
swdhgk
wkpdgu
aybzge
emnvgo
jbashz
npmohj
rdykht
vrkghd
zfwchn
dtiyhx
lvgqhr
pjsmhb
txeihl
xlqehv
bzcahf
fnowhp
kcbtia
oqnpik
sezliu
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eujziy
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qktnic
uyfjim
ymrfiw
cadbig
gopxiq
ldcujb
proqjl
tfamjv
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bhyejp
fvkajz
nxisjt
rluojd
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dbecjh
hpqyjr
medvkc
qsprkm
ugbnkw
yunjkg
cizfkq
gwlbka
oyjtku
smvpke
wahlko
aothky
ecfdki
iqrzks
nfewld
rtqsln
vhcolx
zvoklh
djaglr
hxmclb
pzkulv
tnwqlf
xbimlp
bpuilz
fdgelj
jrsalt
ogfxme
surtmo
widpmy
awplmi
ekbhms
iyndmc
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cqvjma
gehfmk
kstbmu
phgynf
tvsunp
xjeqnz
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flcint
jzoend
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vpysnh
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drwknb
hfignl
ltucnv
qihzog
uwtvoq
ykfroa
cyrnok
gmdjou
kapfoe
scnxoy
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aelpos
esxloc
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muvdow
rjiaph
vxuwpr
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dzsopl
hnekpv
lbqgpf
tdoypz
xraupj
bfmqpt
ftympd
jhkipn
nvwepx
skjbqi
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amhtqc
eatpqm
ioflqw
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uepzqa
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cgnrqu
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kiljqo
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xzwyrt
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dpkwtf
hdwstp
lriotz
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xhsctd
bveytn
fjqutx
jxcqth
nlomtr
rzaitb
wonfum
aczbuw
eqlxug
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msjpua
qgvluk
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gkrvuy
kydrui
ompnus
sabjuc
xpogvn
bdacvx
frmyvh
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tbckvd
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oulrwc
sixnwm
akvfwg
eyhbwq
imtxwa
maftwk
qorpwu
ucdlwe
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dfcexz
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jnuyxb
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asrjyq
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qwntye
ukzpyo
cmxhyi
gajdys
kovzyc
ochvym
sqtryw
wefnyg
btskzr
fhegzb
jvqczl
njcyzv
rxouzf
vlaqzp
dnyizj
hbkezt
lpwazd
pdiwzn
truszx
xfgozh
cutlas
gifhac
kwrdam
okdzaw
sypvag
wmbraq
eozjak
iclfau
mqxbae
qejxao
usvtay
yghpai

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: cutlas
Cipher: phgynf

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: cutlas
Cipher: 315444131134

Extended Methods:
Method #1

Plaintext: cutlas
method variations:
hzyqfxnedvlcskiaqhxpofvn

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath: 
c u t l a s 
3 5 4 1 1 3 
1 4 4 3 1 4
They are then read out in rows:
354113144314
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: cutlas
Cipher: xdlqoq

Read more ...
Method #3

Plaintext: cutlas
method variations:
vtdclo tdclov dclovt
clovtd lovtdc ovtdcl

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: cutlas
all 720 cipher variations:
cutlas
cutlsa
cutals
cutasl
cutsal
cutsla
cultas
cultsa
culats
culast
culsat
culsta
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ctulas
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ctusal
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scutal
scutla

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


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