easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

northpole

yardang

preobject

sudamerican

ulvaque

machilis

piseco

cerotene

leewill

hominesne

untinged

waukau

osteocartilagenous

impairing

barometers

antifibrinolyticus

frequenting

energia


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: vidhya
cipher variations:
wjeizb xkfjac ylgkbd zmhlce animdf
bojneg cpkofh dqlpgi ermqhj fsnrik
gtosjl huptkm ivquln jwrvmo kxswnp
lytxoq mzuypr navzqs obwart pcxbsu
qdyctv rezduw sfaevx tgbfwy uhcgxz

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: vidhya
Cipher: erwsbz

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: vidhya
Cipher: BBBAB ABAAA AAABB AABBB BABBA 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: vidhya
cipher variations:
wjeizb
mzkwvb
cpqkrb
sfwynb
ivcmjb
yliafb
erucxb
uhaqtb
kxgepb
anmslb
qdsghb
gtyudb
xkfjac
nalxwc
dqrlsc
tgxzoc
jwdnkc
zmjbgc
fsvdyc
vibruc
lyhfqc
bontmc
rethic
huzvec
ylgkbd
obmyxd
ersmtd
uhyapd
kxeold
ankchd
gtwezd
wjcsvd
mzigrd
cpound
sfuijd
ivawfd
zmhlce
pcnzye
fstnue
vizbqe
lyfpme
boldie
huxfae
xkdtwe
najhse
dqpvoe
tgvjke
jwbxge
animdf
qdoazf
gtuovf
wjacrf
mzgqnf
cpmejf
ivygbf
yleuxf
obkitf
erqwpf
uhwklf
kxcyhf
bojneg
repbag
huvpwg
xkbdsg
nahrog
dqnfkg
jwzhcg
zmfvyg
pcljug
fsrxqg
vixlmg
lydzig
cpkofh
sfqcbh
ivwqxh
ylceth
obisph
eroglh
kxaidh
angwzh
qdmkvh
gtsyrh
wjymnh
mzeajh
dqlpgi
tgrdci
jwxryi
zmdfui
pcjtqi
fsphmi
lybjei
bohxai
renlwi
hutzsi
xkznoi
nafbki
ermqhj
uhsedj
kxyszj
anegvj
qdkurj
gtqinj
mzckfj
cpiybj
sfomxj
ivuatj
ylaopj
obgclj
fsnrik
vitfek
lyztak
bofhwk
relvsk
hurjok
nadlgk
dqjzck
tgpnyk
jwvbuk
zmbpqk
pchdmk
gtosjl
wjugfl
mzaubl
cpgixl
sfmwtl
ivskpl
obemhl
erkadl
uhqozl
kxwcvl
ancqrl
qdienl
huptkm
xkvhgm
nabvcm
dqhjym
tgnxum
jwtlqm
pcfnim
fslbem
virpam
lyxdwm
bodrsm
rejfom
ivquln
ylwihn
obcwdn
erikzn
uhoyvn
kxumrn
qdgojn
gtmcfn
wjsqbn
mzyexn
cpestn
sfkgpn
jwrvmo
zmxjio
pcdxeo
fsjlao
vipzwo
lyvnso
rehpko
hundgo
xktrco
nazfyo
dqftuo
tglhqo
kxswnp
anykjp
qdeyfp
gtkmbp
wjqaxp
mzwotp
sfiqlp
ivoehp
ylusdp
obagzp
erguvp
uhmirp
lytxoq
bozlkq
refzgq
hulncq
xkrbyq
naxpuq
tgjrmq
jwpfiq
zmvteq
pcbhaq
fshvwq
vinjsq
mzuypr
cpamlr
sfgahr
ivmodr
ylsczr
obyqvr
uhksnr
kxqgjr
anwufr
qdcibr
gtiwxr
wjoktr
navzqs
dqbnms
tghbis
jwnpes
zmtdas
pczrws
viltos
lyrhks
boxvgs
redjcs
hujxys
xkplus
obwart
ercont
uhicjt
kxoqft
anuebt
qdasxt
wjmupt
mzsilt
cpywht
sfekdt
ivkyzt
ylqmvt
pcxbsu
fsdpou
vijdku
lyprgu
bovfcu
rebtyu
xknvqu
natjmu
dqzxiu
tgfleu
jwlzau
zmrnwu
qdyctv
gteqpv
wjkelv
mzqshv
cpwgdv
sfcuzv
ylowrv
obuknv
erayjv
uhgmfv
kxmabv
ansoxv
rezduw
hufrqw
xklfmw
nartiw
dqxhew
tgdvaw
zmpxsw
pcvlow
fsbzkw
vihngw
lynbcw
botpyw
sfaevx
ivgsrx
ylmgnx
obsujx
eryifx
uhewbx
anqytx
qdwmpx
gtcalx
wjiohx
mzocdx
cpuqzx
tgbfwy
jwhtsy
zmnhoy
pctvky
fszjgy
vifxcy
borzuy
rexnqy
hudbmy
xkjpiy
napdey
dqvray
uhcgxz
kxiutz
anoipz
qduwlz
gtakhz
wjgydz
cpsavz
sfyorz
ivecnz
ylkqjz
obqefz
erwsbz
vidhya
lyjvua
bopjqa
revxma
hublia
xkhzea
dqtbwa
tgzpsa
jwfdoa
zmlrka
pcrfga
fsxtca

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: vidhya
Cipher: ivquln

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: vidhya
Cipher: 154241324511

Extended Methods:
Method #1

Plaintext: vidhya
method variations:
aoindfftosillytxoqqdyctv

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath: 
v i d h y a 
1 4 4 3 4 1 
5 2 1 2 5 1
They are then read out in rows:
144341521251
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: vidhya
Cipher: qodkfe

Read more ...
Method #3

Plaintext: vidhya
method variations:
urlrea rlreau lreaur
reaurl eaurlr aurlre

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: vidhya
all 720 cipher variations:
vidhya
vidhay
vidyha
vidyah
vidayh
vidahy
vihdya
vihday
vihyda
vihyad
vihayd
vihady
viyhda
viyhad
viydha
viydah
viyadh
viyahd
viahyd
viahdy
viayhd
viaydh
viadyh
viadhy
vdihya
vdihay
vdiyha
vdiyah
vdiayh
vdiahy
vdhiya
vdhiay
vdhyia
vdhyai
vdhayi
vdhaiy
vdyhia
vdyhai
vdyiha
vdyiah
vdyaih
vdyahi
vdahyi
vdahiy
vdayhi
vdayih
vdaiyh
vdaihy
vhdiya
vhdiay
vhdyia
vhdyai
vhdayi
vhdaiy
vhidya
vhiday
vhiyda
vhiyad
vhiayd
vhiady
vhyida
vhyiad
vhydia
vhydai
vhyadi
vhyaid
vhaiyd
vhaidy
vhayid
vhaydi
vhadyi
vhadiy
vydhia
vydhai
vydiha
vydiah
vydaih
vydahi
vyhdia
vyhdai
vyhida
vyhiad
vyhaid
vyhadi
vyihda
vyihad
vyidha
vyidah
vyiadh
vyiahd
vyahid
vyahdi
vyaihd
vyaidh
vyadih
vyadhi
vadhyi
vadhiy
vadyhi
vadyih
vadiyh
vadihy
vahdyi
vahdiy
vahydi
vahyid
vahiyd
vahidy
vayhdi
vayhid
vaydhi
vaydih
vayidh
vayihd
vaihyd
vaihdy
vaiyhd
vaiydh
vaidyh
vaidhy
ivdhya
ivdhay
ivdyha
ivdyah
ivdayh
ivdahy
ivhdya
ivhday
ivhyda
ivhyad
ivhayd
ivhady
ivyhda
ivyhad
ivydha
ivydah
ivyadh
ivyahd
ivahyd
ivahdy
ivayhd
ivaydh
ivadyh
ivadhy
idvhya
idvhay
idvyha
idvyah
idvayh
idvahy
idhvya
idhvay
idhyva
idhyav
idhayv
idhavy
idyhva
idyhav
idyvha
idyvah
idyavh
idyahv
idahyv
idahvy
idayhv
idayvh
idavyh
idavhy
ihdvya
ihdvay
ihdyva
ihdyav
ihdayv
ihdavy
ihvdya
ihvday
ihvyda
ihvyad
ihvayd
ihvady
ihyvda
ihyvad
ihydva
ihydav
ihyadv
ihyavd
ihavyd
ihavdy
ihayvd
ihaydv
ihadyv
ihadvy
iydhva
iydhav
iydvha
iydvah
iydavh
iydahv
iyhdva
iyhdav
iyhvda
iyhvad
iyhavd
iyhadv
iyvhda
iyvhad
iyvdha
iyvdah
iyvadh
iyvahd
iyahvd
iyahdv
iyavhd
iyavdh
iyadvh
iyadhv
iadhyv
iadhvy
iadyhv
iadyvh
iadvyh
iadvhy
iahdyv
iahdvy
iahydv
iahyvd
iahvyd
iahvdy
iayhdv
iayhvd
iaydhv
iaydvh
iayvdh
iayvhd
iavhyd
iavhdy
iavyhd
iavydh
iavdyh
iavdhy
divhya
divhay
divyha
divyah
divayh
divahy
dihvya
dihvay
dihyva
dihyav
dihayv
dihavy
diyhva
diyhav
diyvha
diyvah
diyavh
diyahv
diahyv
diahvy
diayhv
diayvh
diavyh
diavhy
dvihya
dvihay
dviyha
dviyah
dviayh
dviahy
dvhiya
dvhiay
dvhyia
dvhyai
dvhayi
dvhaiy
dvyhia
dvyhai
dvyiha
dvyiah
dvyaih
dvyahi
dvahyi
dvahiy
dvayhi
dvayih
dvaiyh
dvaihy
dhviya
dhviay
dhvyia
dhvyai
dhvayi
dhvaiy
dhivya
dhivay
dhiyva
dhiyav
dhiayv
dhiavy
dhyiva
dhyiav
dhyvia
dhyvai
dhyavi
dhyaiv
dhaiyv
dhaivy
dhayiv
dhayvi
dhavyi
dhaviy
dyvhia
dyvhai
dyviha
dyviah
dyvaih
dyvahi
dyhvia
dyhvai
dyhiva
dyhiav
dyhaiv
dyhavi
dyihva
dyihav
dyivha
dyivah
dyiavh
dyiahv
dyahiv
dyahvi
dyaihv
dyaivh
dyavih
dyavhi
davhyi
davhiy
davyhi
davyih
daviyh
davihy
dahvyi
dahviy
dahyvi
dahyiv
dahiyv
dahivy
dayhvi
dayhiv
dayvhi
dayvih
dayivh
dayihv
daihyv
daihvy
daiyhv
daiyvh
daivyh
daivhy
hidvya
hidvay
hidyva
hidyav
hidayv
hidavy
hivdya
hivday
hivyda
hivyad
hivayd
hivady
hiyvda
hiyvad
hiydva
hiydav
hiyadv
hiyavd
hiavyd
hiavdy
hiayvd
hiaydv
hiadyv
hiadvy
hdivya
hdivay
hdiyva
hdiyav
hdiayv
hdiavy
hdviya
hdviay
hdvyia
hdvyai
hdvayi
hdvaiy
hdyvia
hdyvai
hdyiva
hdyiav
hdyaiv
hdyavi
hdavyi
hdaviy
hdayvi
hdayiv
hdaiyv
hdaivy
hvdiya
hvdiay
hvdyia
hvdyai
hvdayi
hvdaiy
hvidya
hviday
hviyda
hviyad
hviayd
hviady
hvyida
hvyiad
hvydia
hvydai
hvyadi
hvyaid
hvaiyd
hvaidy
hvayid
hvaydi
hvadyi
hvadiy
hydvia
hydvai
hydiva
hydiav
hydaiv
hydavi
hyvdia
hyvdai
hyvida
hyviad
hyvaid
hyvadi
hyivda
hyivad
hyidva
hyidav
hyiadv
hyiavd
hyavid
hyavdi
hyaivd
hyaidv
hyadiv
hyadvi
hadvyi
hadviy
hadyvi
hadyiv
hadiyv
hadivy
havdyi
havdiy
havydi
havyid
haviyd
havidy
hayvdi
hayvid
haydvi
haydiv
hayidv
hayivd
haivyd
haivdy
haiyvd
haiydv
haidyv
haidvy
yidhva
yidhav
yidvha
yidvah
yidavh
yidahv
yihdva
yihdav
yihvda
yihvad
yihavd
yihadv
yivhda
yivhad
yivdha
yivdah
yivadh
yivahd
yiahvd
yiahdv
yiavhd
yiavdh
yiadvh
yiadhv
ydihva
ydihav
ydivha
ydivah
ydiavh
ydiahv
ydhiva
ydhiav
ydhvia
ydhvai
ydhavi
ydhaiv
ydvhia
ydvhai
ydviha
ydviah
ydvaih
ydvahi
ydahvi
ydahiv
ydavhi
ydavih
ydaivh
ydaihv
yhdiva
yhdiav
yhdvia
yhdvai
yhdavi
yhdaiv
yhidva
yhidav
yhivda
yhivad
yhiavd
yhiadv
yhvida
yhviad
yhvdia
yhvdai
yhvadi
yhvaid
yhaivd
yhaidv
yhavid
yhavdi
yhadvi
yhadiv
yvdhia
yvdhai
yvdiha
yvdiah
yvdaih
yvdahi
yvhdia
yvhdai
yvhida
yvhiad
yvhaid
yvhadi
yvihda
yvihad
yvidha
yvidah
yviadh
yviahd
yvahid
yvahdi
yvaihd
yvaidh
yvadih
yvadhi
yadhvi
yadhiv
yadvhi
yadvih
yadivh
yadihv
yahdvi
yahdiv
yahvdi
yahvid
yahivd
yahidv
yavhdi
yavhid
yavdhi
yavdih
yavidh
yavihd
yaihvd
yaihdv
yaivhd
yaivdh
yaidvh
yaidhv
aidhyv
aidhvy
aidyhv
aidyvh
aidvyh
aidvhy
aihdyv
aihdvy
aihydv
aihyvd
aihvyd
aihvdy
aiyhdv
aiyhvd
aiydhv
aiydvh
aiyvdh
aiyvhd
aivhyd
aivhdy
aivyhd
aivydh
aivdyh
aivdhy
adihyv
adihvy
adiyhv
adiyvh
adivyh
adivhy
adhiyv
adhivy
adhyiv
adhyvi
adhvyi
adhviy
adyhiv
adyhvi
adyihv
adyivh
adyvih
adyvhi
advhyi
advhiy
advyhi
advyih
adviyh
advihy
ahdiyv
ahdivy
ahdyiv
ahdyvi
ahdvyi
ahdviy
ahidyv
ahidvy
ahiydv
ahiyvd
ahivyd
ahivdy
ahyidv
ahyivd
ahydiv
ahydvi
ahyvdi
ahyvid
ahviyd
ahvidy
ahvyid
ahvydi
ahvdyi
ahvdiy
aydhiv
aydhvi
aydihv
aydivh
aydvih
aydvhi
ayhdiv
ayhdvi
ayhidv
ayhivd
ayhvid
ayhvdi
ayihdv
ayihvd
ayidhv
ayidvh
ayivdh
ayivhd
ayvhid
ayvhdi
ayvihd
ayvidh
ayvdih
ayvdhi
avdhyi
avdhiy
avdyhi
avdyih
avdiyh
avdihy
avhdyi
avhdiy
avhydi
avhyid
avhiyd
avhidy
avyhdi
avyhid
avydhi
avydih
avyidh
avyihd
avihyd
avihdy
aviyhd
aviydh
avidyh
avidhy

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


© 2011 Easy Ciphers. All rights reserved. contact us