easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

circumveniebasque

gilbert

unequitably

niebling

corruptingly

torsisset

bayldonite

unlimitedly

tadpoles

archduchy

pyraeque

monosilicate

effingereque

unconquerable

jarol

prefixing

adhesiva

unemulous


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: kerber
cipher variations:
lfscfs mgtdgt nhuehu oivfiv pjwgjw
qkxhkx rlyily smzjmz tnakna uoblob
vpcmpc wqdnqd xreore ysfpsf ztgqtg
auhruh bvisvi cwjtwj dxkuxk eylvyl
fzmwzm ganxan hboybo icpzcp jdqadq

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: kerber
Cipher: pviyvi

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: kerber
Cipher: ABAAB AABAA BAAAA AAAAB AABAA BAAAA

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: kerber
cipher variations:
lfscfs
fnaena
zvigvi
tdqidq
nlykly
htgmtg
vjwqjw
presre
jzmuzm
dhuwhu
xpcypc
rxkaxk
mgtdgt
gobfob
awjhwj
uerjer
omzlmz
iuhnuh
wkxrkx
qsftsf
kanvan
eivxiv
yqdzqd
sylbyl
nhuehu
hpcgpc
bxkixk
vfskfs
pnamna
jviovi
xlysly
rtgutg
lbowbo
fjwyjw
zreare
tzmczm
oivfiv
iqdhqd
cyljyl
wgtlgt
qobnob
kwjpwj
ymztmz
suhvuh
mcpxcp
gkxzkx
asfbsf
uandan
pjwgjw
jreire
dzmkzm
xhumhu
rpcopc
lxkqxk
znauna
tviwvi
ndqydq
hlyaly
btgctg
vboebo
qkxhkx
ksfjsf
eanlan
yivniv
sqdpqd
mylryl
aobvob
uwjxwj
oerzer
imzbmz
cuhduh
wcpfcp
rlyily
ltgktg
fbombo
zjwojw
treqre
nzmszm
bpcwpc
vxkyxk
pfsafs
jnacna
dvievi
xdqgdq
smzjmz
muhluh
gcpncp
akxpkx
usfrsf
oantan
cqdxqd
wylzyl
qgtbgt
kobdob
ewjfwj
yerher
tnakna
nvimvi
hdqodq
blyqly
vtgstg
pboubo
dreyre
xzmazm
rhuchu
lpcepc
fxkgxk
zfsifs
uoblob
owjnwj
ierper
cmzrmz
wuhtuh
qcpvcp
esfzsf
yanban
sivdiv
mqdfqd
gylhyl
agtjgt
vpcmpc
pxkoxk
jfsqfs
dnasna
xviuvi
rdqwdq
ftgatg
zbocbo
tjwejw
nregre
hzmizm
bhukhu
wqdnqd
qylpyl
kgtrgt
eobtob
ywjvwj
serxer
guhbuh
acpdcp
ukxfkx
osfhsf
ianjan
civliv
xreore
rzmqzm
lhushu
fpcupc
zxkwxk
tfsyfs
hvicvi
bdqedq
vlygly
ptgitg
jbokbo
djwmjw
ysfpsf
sanran
mivtiv
gqdvqd
aylxyl
ugtzgt
iwjdwj
cerfer
wmzhmz
quhjuh
kcplcp
ekxnkx
ztgqtg
tbosbo
njwujw
hrewre
bzmyzm
vhuahu
jxkexk
dfsgfs
xnaina
rvikvi
ldqmdq
flyoly
auhruh
ucptcp
okxvkx
isfxsf
canzan
wivbiv
kylfyl
egthgt
yobjob
swjlwj
merner
gmzpmz
bvisvi
vdqudq
plywly
jtgytg
dboabo
xjwcjw
lzmgzm
fhuihu
zpckpc
txkmxk
nfsofs
hnaqna
cwjtwj
werver
qmzxmz
kuhzuh
ecpbcp
ykxdkx
manhan
givjiv
aqdlqd
uylnyl
ogtpgt
iobrob
dxkuxk
xfswfs
rnayna
lviavi
fdqcdq
zlyely
nboibo
hjwkjw
bremre
vzmozm
phuqhu
jpcspc
eylvyl
ygtxgt
sobzob
mwjbwj
gerder
amzfmz
ocpjcp
ikxlkx
csfnsf
wanpan
qivriv
kqdtqd
fzmwzm
zhuyhu
tpcapc
nxkcxk
hfsefs
bnagna
pdqkdq
jlymly
dtgotg
xboqbo
rjwsjw
lreure
ganxan
aivziv
uqdbqd
oyldyl
igtfgt
cobhob
qerler
kmznmz
euhpuh
ycprcp
skxtkx
msfvsf
hboybo
bjwajw
vrecre
pzmezm
jhughu
dpcipc
rfsmfs
lnaona
fviqvi
zdqsdq
tlyuly
ntgwtg
icpzcp
ckxbkx
wsfdsf
qanfan
kivhiv
eqdjqd
sgtngt
mobpob
gwjrwj
aerter
umzvmz
ouhxuh
jdqadq
dlycly
xtgetg
rbogbo
ljwijw
frekre
thuohu
npcqpc
hxksxk
bfsufs
vnawna
pviyvi
kerber
emzdmz
yuhfuh
scphcp
mkxjkx
gsflsf
uivpiv
oqdrqd
iyltyl
cgtvgt
wobxob
qwjzwj

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: kerber
Cipher: xreore

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: kerber
Cipher: 525124215124

Extended Methods:
Method #1

Plaintext: kerber
method variations:
pkwgkwupbmpbzugrugezmwzm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath: 
k e r b e r 
5 5 2 2 5 2 
2 1 4 1 1 4
They are then read out in rows:
552252214114
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: kerber
Cipher: zgkbdq

Read more ...
Method #3

Plaintext: kerber
method variations:
wfivfy fivfyw ivfywf
vfywfi fywfiv ywfivf

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: kerber
all 720 cipher variations:
kerber
kerbre
kerebr
kererb
kerreb
kerrbe
kebrer
kebrre
keberr
keberr
kebrer
kebrre
keebrr
keebrr
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keerrb
keerrb
keerbr
kerber
kerbre
kerebr
kererb
kerreb
kerrbe
kreber
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reekrb
reekbr
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rekreb
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rkrbee
rkrbee
rkrebe
rkreeb
rkreeb
rkrebe
rkbree
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rkbere
rkbeer
rkbeer
rkbere
rkebre
rkeber
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rkereb
rkeerb
rkeebr
rkeber
rkebre
rkeebr
rkeerb
rkereb
rkerbe

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


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