easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

connector

aguero

chumawi

billionaire

arsines

migenes

handmaiden

fivebar

invisisset

groupie

gemelli

siderunt

maiste

macaslan

highspire

cherethims

pleiotropy

undergroan


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: kowhai
cipher variations:
lpxibj mqyjck nrzkdl osalem ptbmfn
qucngo rvdohp swepiq txfqjr uygrks
vzhslt waitmu xbjunv yckvow zdlwpx
aemxqy bfnyrz cgozsa dhpatb eiqbuc
fjrcvd gksdwe hltexf imufyg jnvgzh

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: kowhai
Cipher: pldszr

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: kowhai
Cipher: ABAAB ABBAB BABAA AABBB AAAAA ABAAA

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: kowhai
cipher variations:
lpxibj
frpwbz
zthkbp
tvzybf
nxrmbv
hzjabl
vdtcbr
pflqbh
jhdebx
djvsbn
xlngbd
rnfubt
mqyjck
gsqxca
auilcq
uwazcg
oysncw
iakbcm
weudcs
qgmrci
kiefcy
ekwtco
ymohce
sogvcu
nrzkdl
htrydb
bvjmdr
vxbadh
pztodx
jblcdn
xfvedt
rhnsdj
ljfgdz
flxudp
znpidf
tphwdv
osalem
iuszec
cwknes
wycbei
qaupey
kcmdeo
ygwfeu
siotek
mkghea
gmyveq
aoqjeg
uqixew
ptbmfn
jvtafd
dxloft
xzdcfj
rbvqfz
ldnefp
zhxgfv
tjpufl
nlhifb
hnzwfr
bprkfh
vrjyfx
qucngo
kwubge
eympgu
yaedgk
scwrga
meofgq
aiyhgw
ukqvgm
omijgc
ioaxgs
cqslgi
wskzgy
rvdohp
lxvchf
fznqhv
zbfehl
tdxshb
nfpghr
bjzihx
vlrwhn
pnjkhd
jpbyht
drtmhj
xtlahz
swepiq
mywdig
gaoriw
acgfim
ueytic
ogqhis
ckajiy
wmsxio
qoklie
kqcziu
esunik
yumbia
txfqjr
nzxejh
hbpsjx
bdhgjn
vfzujd
phrijt
dlbkjz
xntyjp
rplmjf
lrdajv
ftvojl
zvncjb
uygrks
oayfki
icqtky
ceihko
wgavke
qisjku
emclka
youzkq
sqmnkg
msebkw
guwpkm
awodkc
vzhslt
pbzglj
jdrulz
dfjilp
xhbwlf
rjtklv
fndmlb
zpvalr
trnolh
ntfclx
hvxqln
bxpeld
waitmu
qcahmk
kesvma
egkjmq
yicxmg
skulmw
goenmc
aqwbms
usopmi
ougdmy
iwyrmo
cyqfme
xbjunv
rdbinl
lftwnb
fhlknr
zjdynh
tlvmnx
hpfond
brxcnt
vtpqnj
pvhenz
jxzsnp
dzrgnf
yckvow
secjom
mguxoc
gimlos
akezoi
umwnoy
iqgpoe
csydou
wuqrok
qwifoa
kyatoq
eashog
zdlwpx
tfdkpn
nhvypd
hjnmpt
blfapj
vnxopz
jrhqpf
dtzepv
xvrspl
rxjgpb
lzbupr
fbtiph
aemxqy
ugelqo
oiwzqe
ikonqu
cmgbqk
woypqa
ksirqg
euafqw
ywstqm
sykhqc
macvqs
gcujqi
bfnyrz
vhfmrp
pjxarf
jlporv
dnhcrl
xpzqrb
ltjsrh
fvbgrx
zxturn
tzlird
nbdwrt
hdvkrj
cgozsa
wignsq
qkybsg
kmqpsw
eoidsm
yqarsc
muktsi
gwchsy
ayuvso
uamjse
ocexsu
iewlsk
dhpatb
xjhotr
rlzcth
lnrqtx
fpjetn
zrbstd
nvlutj
hxditz
bzvwtp
vbnktf
pdfytv
jfxmtl
eiqbuc
ykipus
smadui
mosruy
gqkfuo
asctue
owmvuk
iyejua
cawxuq
wcolug
qegzuw
kgynum
fjrcvd
zljqvt
tnbevj
nptsvz
hrlgvp
btduvf
pxnwvl
jzfkvb
dbxyvr
xdpmvh
rfhavx
lhzovn
gksdwe
amkrwu
uocfwk
oqutwa
ismhwq
cuevwg
qyoxwm
kaglwc
ecyzws
yeqnwi
sgibwy
miapwo
hltexf
bnlsxv
vpdgxl
prvuxb
jtnixr
dvfwxh
rzpyxn
lbhmxd
fdzaxt
zfroxj
thjcxz
njbqxp
imufyg
comtyw
wqehym
qswvyc
kuojys
ewgxyi
saqzyo
mcinye
geabyu
agspyk
uikdya
okcryq
jnvgzh
dpnuzx
xrfizn
rtxwzd
lvpkzt
fxhyzj
tbrazp
ndjozf
hfbczv
bhtqzl
vjlezb
pldszr
kowhai
eqovay
ysgjao
suyxae
mwqlau
gyizak
ucsbaq
oekpag
igcdaw
ciuram
wkmfac
qmetas

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: kowhai
Cipher: xbjunv

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: kowhai
Cipher: 524325321142

Extended Methods:
Method #1

Plaintext: kowhai
method variations:
ptbnfouygsltzdmxqyeircvd

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath: 
k o w h a i 
5 4 2 3 1 4 
2 3 5 2 1 2
They are then read out in rows:
542314235212
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: kowhai
Cipher: umqmkf

Read more ...
Method #3

Plaintext: kowhai
method variations:
rhpbqw hpbqwr pbqwrh
bqwrhp qwrhpb wrhpbq

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: kowhai
all 720 cipher variations:
kowhai
kowhia
kowahi
kowaih
kowiah
kowiha
kohwai
kohwia
kohawi
kohaiw
kohiaw
kohiwa
koahwi
koahiw
koawhi
koawih
koaiwh
koaihw
koihaw
koihwa
koiahw
koiawh
koiwah
koiwha
kwohai
kwohia
kwoahi
kwoaih
kwoiah
kwoiha
kwhoai
kwhoia
kwhaoi
kwhaio
kwhiao
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kwahoi
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khioaw
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kawhio
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iahkow
iahkwo
iaohwk
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iaowhk
iaowkh
iaokwh
iaokhw
iakhow
iakhwo
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ikwaho
ikwaoh
ikwoah
ikwoha
ikhwao
ikhwoa
ikhawo
ikhaow
ikhoaw
ikhowa
ikahwo
ikahow
ikawho
ikawoh
ikaowh
ikaohw
ikohaw
ikohwa
ikoahw
ikoawh
ikowah
ikowha

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


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