easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

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nonemulative

hourglasses

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wellflt


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: guiler
cipher variations:
hvjmfs iwkngt jxlohu kympiv lznqjw
maorkx nbpsly ocqtmz pdruna qesvob
rftwpc sguxqd thvyre uiwzsf vjxatg
wkybuh xlzcvi ymadwj znbexk aocfyl
bpdgzm cqehan drfibo esgjcp fthkdq

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: guiler
Cipher: tfrovi

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: guiler
Cipher: AABBA BAABB ABAAA ABABA 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: guiler
cipher variations:
hvjmfs
tjzina
fxpevi
rlfadq
dzvwly
pnlstg
nprkjw
zdhgre
lrxczm
xfnyhu
jtdupc
vhtqxk
iwkngt
ukajob
gyqfwj
smgber
eawxmz
qomtuh
oqslkx
aeihsf
msydan
ygoziv
kuevqd
wiuryl
jxlohu
vlbkpc
hzrgxk
tnhcfs
fbxyna
rpnuvi
prtmly
bfjitg
ntzebo
zhpajw
lvfwre
xjvszm
kympiv
wmclqd
iashyl
uoidgt
gcyzob
sqovwj
qsunmz
cgkjuh
ouafcp
aiqbkx
mwgxsf
ykwtan
lznqjw
xndmre
jbtizm
vpjehu
hdzapc
trpwxk
rtvona
dhlkvi
pvbgdq
bjrcly
nxhytg
zlxubo
maorkx
yoensf
kcujan
wqkfiv
ieabqd
usqxyl
suwpob
eimlwj
qwcher
cksdmz
oyizuh
amyvcp
nbpsly
zpfotg
ldvkbo
xrlgjw
jfbcre
vtryzm
tvxqpc
fjnmxk
rxdifs
dltena
pzjavi
bnzwdq
ocqtmz
aqgpuh
mewlcp
ysmhkx
kgcdsf
wuszan
uwyrqd
gkonyl
syejgt
emufob
qakbwj
coaxer
pdruna
brhqvi
nfxmdq
ztnily
lhdetg
xvtabo
vxzsre
hlpozm
tzfkhu
fnvgpc
rblcxk
dpbyfs
qesvob
csirwj
ogyner
auojmz
miefuh
ywubcp
wyatsf
imqpan
uagliv
gowhqd
scmdyl
eqczgt
rftwpc
dtjsxk
phzofs
bvpkna
njfgvi
zxvcdq
xzbutg
jnrqbo
vbhmjw
hpxire
tdnezm
frdahu
sguxqd
euktyl
qiapgt
cwqlob
okghwj
aywder
yacvuh
kosrcp
wcinkx
iqyjsf
ueofan
gsebiv
thvyre
fvluzm
rjbqhu
dxrmpc
plhixk
bzxefs
zbdwvi
lptsdq
xdjoly
jrzktg
vfpgbo
htfcjw
uiwzsf
gwmvan
skcriv
eysnqd
qmijyl
cayfgt
acexwj
mquter
yekpmz
ksaluh
wgqhcp
iugdkx
vjxatg
hxnwbo
tldsjw
fztore
rnjkzm
dbzghu
bdfyxk
nrvufs
zflqna
ltbmvi
xhridq
jvhely
wkybuh
iyoxcp
umetkx
gaupsf
soklan
ecahiv
cegzyl
oswvgt
agmrob
mucnwj
yisjer
kwifmz
xlzcvi
jzpydq
vnfuly
hbvqtg
tplmbo
fdbijw
dfhazm
ptxwhu
bhnspc
nvdoxk
zjtkfs
lxjgna
ymadwj
kaqzer
wogvmz
icwruh
uqmncp
gecjkx
egiban
quyxiv
ciotqd
owepyl
akulgt
mykhob
znbexk
lbrafs
xphwna
jdxsvi
vrnodq
hfdkly
fhjcbo
rvzyjw
djpure
pxfqzm
blvmhu
nzlipc
aocfyl
mcsbgt
yqixob
keytwj
wsoper
igelmz
gikdcp
swazkx
ekqvsf
qygran
cmwniv
oamjqd
bpdgzm
ndtchu
zrjypc
lfzuxk
xtpqfs
jhfmna
hjledq
txbaly
flrwtg
rzhsbo
dnxojw
pbnkre
cqehan
oeudiv
askzqd
mgavyl
yuqrgt
kignob
ikmfer
uycbmz
gmsxuh
saitcp
eoypkx
qcolsf
drfibo
pfvejw
btlare
nhbwzm
zvrshu
ljhopc
jlngfs
vzdcna
hntyvi
tbjudq
fpzqly
rdpmtg
esgjcp
qgwfkx
cumbsf
oicxan
awstiv
mkipqd
kmohgt
waedob
iouzwj
uckver
gqarmz
seqnuh
fthkdq
rhxgly
dvnctg
pjdybo
bxtujw
nljqre
lnpihu
xbfepc
jpvaxk
vdlwfs
hrbsna
tfrovi
guiler
siyhmz
ewoduh
qkezcp
cyuvkx
omkrsf
moqjiv
ycgfqd
kqwbyl
wemxgt
isctob
ugspwj

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: guiler
Cipher: thvyre

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: guiler
Cipher: 225442135124

Extended Methods:
Method #1

Plaintext: guiler
method variations:
mzoqkwretvpbwkyaugbpdfzm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath: 
g u i l e r 
2 5 4 1 5 2 
2 4 2 3 1 4
They are then read out in rows:
254152242314
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: guiler
Cipher: wdkrmq

Read more ...
Method #3

Plaintext: guiler
method variations:
wtbxfi tbxfiw bxfiwt
xfiwtb fiwtbx iwtbxf

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: guiler
all 720 cipher variations:
guiler
guilre
guielr
guierl
guirel
guirle
gulier
gulire
guleir
guleri
gulrei
gulrie
guelir
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gueilr
gueirl
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guriel
gurile
giuler
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giluer
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gilreu
gilrue
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girlue
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rgeuli
rgulei
rgulie
rgueli
rgueil
rguiel
rguile

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


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