easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

vergara

covenanter

festinabimus

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snowberry

monothelitism

egentissimisque

umbellated

societies

neurosclerosis

stirpiculturist

eunike

nibbe

ediditque

partavimusque

outbabble

erycique


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: dhurna
cipher variations:
eivsob fjwtpc gkxuqd hlyvre imzwsf
jnaxtg kobyuh lpczvi mqdawj nrebxk
osfcyl ptgdzm quhean rvifbo swjgcp
txkhdq uylier vzmjfs wankgt xbolhu
ycpmiv zdqnjw aerokx bfsply cgtqmz

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: dhurna
Cipher: wsfimz

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: dhurna
Cipher: AAABB AABBB BAABB BAAAA ABBAA AAAAA

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: dhurna
cipher variations:
eivsob
kwjaob
qkxiob
wylqob
cmzyob
iangob
ucpwob
aqdeob
germob
msfuob
sgtcob
yuhkob
fjwtpc
lxkbpc
rlyjpc
xzmrpc
dnazpc
jbohpc
vdqxpc
brefpc
hfsnpc
ntgvpc
thudpc
zvilpc
gkxuqd
mylcqd
smzkqd
yansqd
eobaqd
kcpiqd
weryqd
csfgqd
igtoqd
ouhwqd
uiveqd
awjmqd
hlyvre
nzmdre
tnalre
zbotre
fpcbre
ldqjre
xfszre
dtghre
jhupre
pvixre
vjwfre
bxknre
imzwsf
oanesf
uobmsf
acpusf
gqdcsf
merksf
ygtasf
euhisf
kivqsf
qwjysf
wkxgsf
cylosf
jnaxtg
pboftg
vpcntg
bdqvtg
hredtg
nfsltg
zhubtg
fvijtg
ljwrtg
rxkztg
xlyhtg
dzmptg
kobyuh
qcpguh
wqdouh
cerwuh
isfeuh
ogtmuh
aivcuh
gwjkuh
mkxsuh
sylauh
ymziuh
eanquh
lpczvi
rdqhvi
xrepvi
dfsxvi
jtgfvi
phunvi
bjwdvi
hxklvi
nlytvi
tzmbvi
znajvi
fborvi
mqdawj
seriwj
ysfqwj
egtywj
kuhgwj
qivowj
ckxewj
iylmwj
omzuwj
uancwj
aobkwj
gcpswj
nrebxk
tfsjxk
ztgrxk
fhuzxk
lvihxk
rjwpxk
dlyfxk
jzmnxk
pnavxk
vbodxk
bpclxk
hdqtxk
osfcyl
ugtkyl
auhsyl
givayl
mwjiyl
skxqyl
emzgyl
kanoyl
qobwyl
wcpeyl
cqdmyl
ieruyl
ptgdzm
vhulzm
bvitzm
hjwbzm
nxkjzm
tlyrzm
fnahzm
lbopzm
rpcxzm
xdqfzm
drenzm
jfsvzm
quhean
wivman
cwjuan
ikxcan
oylkan
umzsan
gobian
mcpqan
sqdyan
yergan
esfoan
kgtwan
rvifbo
xjwnbo
dxkvbo
jlydbo
pzmlbo
vnatbo
hpcjbo
ndqrbo
trezbo
zfshbo
ftgpbo
lhuxbo
swjgcp
ykxocp
eylwcp
kmzecp
qanmcp
wobucp
iqdkcp
oerscp
usfacp
agticp
guhqcp
mivycp
txkhdq
zlypdq
fzmxdq
lnafdq
rbondq
xpcvdq
jreldq
pfstdq
vtgbdq
bhujdq
hvirdq
njwzdq
uylier
amzqer
ganyer
mobger
scpoer
yqdwer
ksfmer
qgtuer
wuhcer
civker
iwjser
okxaer
vzmjfs
bnarfs
hbozfs
npchfs
tdqpfs
zrexfs
ltgnfs
rhuvfs
xvidfs
djwlfs
jxktfs
plybfs
wankgt
cobsgt
icpagt
oqdigt
uerqgt
asfygt
muhogt
sivwgt
ywjegt
ekxmgt
kylugt
qmzcgt
xbolhu
dpcthu
jdqbhu
prejhu
vfsrhu
btgzhu
nviphu
tjwxhu
zxkfhu
flynhu
lzmvhu
rnadhu
ycpmiv
eqduiv
kerciv
qsfkiv
wgtsiv
cuhaiv
owjqiv
ukxyiv
aylgiv
gmzoiv
manwiv
sobeiv
zdqnjw
frevjw
lfsdjw
rtgljw
xhutjw
dvibjw
pxkrjw
vlyzjw
bzmhjw
hnapjw
nboxjw
tpcfjw
aerokx
gsfwkx
mgtekx
suhmkx
yivukx
ewjckx
qylskx
wmzakx
canikx
iobqkx
ocpykx
uqdgkx
bfsply
htgxly
nhufly
tvinly
zjwvly
fxkdly
rzmtly
xnably
dbojly
jpcrly
pdqzly
vrehly
cgtqmz
iuhymz
oivgmz
uwjomz
akxwmz
gylemz
sanumz
yobcmz
ecpkmz
kqdsmz
qeramz
wsfimz
dhurna
jvizna
pjwhna
vxkpna
blyxna
hzmfna
tbovna
zpcdna
fdqlna
lretna
rfsbna
xtgjna

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: dhurna
Cipher: quhean

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: dhurna
Cipher: 413254243311

Extended Methods:
Method #1

Plaintext: dhurna
method variations:
inzwsfosebxltxkgcqycpmhv

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath: 
d h u r n a 
4 3 5 2 3 1 
1 2 4 4 3 1
They are then read out in rows:
435231124431
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: dhurna
Cipher: okcftc

Read more ...
Method #3

Plaintext: dhurna
method variations:
lwiocq wiocql iocqlw
ocqlwi cqlwio qlwioc

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: dhurna
all 720 cipher variations:
dhurna
dhuran
dhunra
dhunar
dhuanr
dhuarn
dhruna
dhruan
dhrnua
dhrnau
dhranu
dhraun
dhnrua
dhnrau
dhnura
dhnuar
dhnaur
dhnaru
dharnu
dharun
dhanru
dhanur
dhaunr
dhaurn
duhrna
duhran
duhnra
duhnar
duhanr
duharn
durhna
durhan
durnha
durnah
duranh
durahn
dunrha
dunrah
dunhra
dunhar
dunahr
dunarh
duarnh
duarhn
duanrh
duanhr
duahnr
duahrn
druhna
druhan
drunha
drunah
druanh
druahn
drhuna
drhuan
drhnua
drhnau
drhanu
drhaun
drnhua
drnhau
drnuha
drnuah
drnauh
drnahu
drahnu
drahun
dranhu
dranuh
draunh
drauhn
dnurha
dnurah
dnuhra
dnuhar
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dnruha
dnruah
dnrhua
dnrhau
dnrahu
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dnhura
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dnarhu
dnaruh
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daurnh
daurhn
daunrh
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dauhnr
dauhrn
darunh
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darhun
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danrhu
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danuhr
danhur
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dahrnu
dahrun
dahnru
dahnur
dahunr
dahurn
hdurna
hduran
hdunra
hdunar
hduanr
hduarn
hdruna
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hdrnua
hdrnau
hdranu
hdraun
hdnrua
hdnrau
hdnura
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hdarun
hdanru
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hdaunr
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hudarn
hurdna
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hurnda
hurnad
hurand
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hunard
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urdhna
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audrnh
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aruhnd
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arunhd
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anhrud
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anhdur
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andrhu
andruh
andhru
andhur
anduhr
andurh
adurnh
adurhn
adunrh
adunhr
aduhnr
aduhrn
adrunh
adruhn
adrnuh
adrnhu
adrhnu
adrhun
adnruh
adnrhu
adnurh
adnuhr
adnhur
adnhru
adhrnu
adhrun
adhnru
adhnur
adhunr
adhurn

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


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