easy ciphers

Easy Ciphers Tools:
cryptography lectures
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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: heinle
cipher variations:
ifjomf jgkpng khlqoh limrpi mjnsqj
nkotrk olpusl pmqvtm qnrwun rosxvo
sptywp tquzxq urvayr vswbzs wtxcat
xuydbu yvzecv zwafdw axbgex bychfy
czdigz daejha ebfkib fcgljc gdhmkd

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: heinle
Cipher: svrmov

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: heinle
Cipher: AABBB AABAA ABAAA ABBAA ABABA AABAA

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: heinle
cipher variations:
ifjomf
wnzoin
kvpoev
ydfoad
mlvowl
atlost
cjrokj
qrhogr
ezxocz
shnoyh
gpdoup
uxtoqx
jgkpng
xoapjo
lwqpfw
zegpbe
nmwpxm
bumptu
dksplk
rsiphs
faypda
tiopzi
hqepvq
vyupry
khlqoh
ypbqkp
mxrqgx
afhqcf
onxqyn
cvnquv
eltqml
stjqit
gbzqeb
ujpqaj
irfqwr
wzvqsz
limrpi
zqcrlq
nysrhy
bgirdg
poyrzo
dworvw
fmurnm
tukrju
hcarfc
vkqrbk
jsgrxs
xawrta
mjnsqj
ardsmr
oztsiz
chjseh
qpzsap
expswx
gnvson
uvlskv
idbsgd
wlrscl
kthsyt
ybxsub
nkotrk
bsetns
pautja
diktfi
rqatbq
fyqtxy
howtpo
vwmtlw
jecthe
xmstdm
luitzu
zcytvc
olpusl
ctfuot
qbvukb
ejlugj
srbucr
gzruyz
ipxuqp
wxnumx
kfduif
yntuen
mvjuav
adzuwd
pmqvtm
dugvpu
rcwvlc
fkmvhk
tscvds
hasvza
jqyvrq
xyovny
lgevjg
zouvfo
nwkvbw
beavxe
qnrwun
evhwqv
sdxwmd
glnwil
utdwet
ibtwab
krzwsr
yzpwoz
mhfwkh
apvwgp
oxlwcx
cfbwyf
rosxvo
fwixrw
teyxne
hmoxjm
vuexfu
jcuxbc
lsaxts
zaqxpa
nigxli
bqwxhq
pymxdy
dgcxzg
sptywp
gxjysx
ufzyof
inpykn
wvfygv
kdvycd
mtbyut
abryqb
ojhymj
crxyir
qznyez
ehdyah
tquzxq
hykzty
vgazpg
joqzlo
xwgzhw
lewzde
nuczvu
bcszrc
pkiznk
dsyzjs
raozfa
fiezbi
urvayr
izlauz
whbaqh
kpramp
yxhaix
mfxaef
ovdawv
cdtasd
qljaol
etzakt
sbpagb
gjfacj
vswbzs
jambva
xicbri
lqsbnq
zyibjy
ngybfg
pwebxw
deubte
rmkbpm
fuablu
tcqbhc
hkgbdk
wtxcat
kbncwb
yjdcsj
mrtcor
azjckz
ohzcgh
qxfcyx
efvcuf
snlcqn
gvbcmv
udrcid
ilhcel
xuydbu
lcodxc
zkedtk
nsudps
bakdla
piadhi
rygdzy
fgwdvg
tomdro
hwcdnw
vesdje
jmidfm
yvzecv
mdpeyd
alfeul
otveqt
cblemb
qjbeij
szheaz
ghxewh
upnesp
ixdeox
wftekf
knjegn
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neqfze
bmgfvm
puwfru
dcmfnc
rkcfjk
taifba
hiyfxi
vqoftq
jyefpy
xguflg
lokfho
axbgex
ofrgaf
cnhgwn
qvxgsv
edngod
sldgkl
ubjgcb
ijzgyj
wrpgur
kzfgqz
yhvgmh
mplgip
bychfy
pgshbg
doihxo
rwyhtw
feohpe
tmehlm
vckhdc
jkahzk
xsqhvs
laghra
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nqmhjq
czdigz
qhtich
epjiyp
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ajxioj
ornikr
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riujdi
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tyajvy
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lmcjbm
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ncijtc
bkyjpk
psojls
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sjvkej
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mndkcn
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odjkud
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fcgljc
tkwlfk
hsmlbs
vaclxa
jislti
xqilpq
zgolhg
noeldo
bwulzw
peklve
dmalrm
ruqlnu
gdhmkd
ulxmgl
itnmct
wbdmyb
kjtmuj
yrjmqr
ahpmih
opfmep
cxvmax
qflmwf
enbmsn
svrmov
heinle
vmynhm
juondu
xcenzc
lkunvk
zsknrs
biqnji
pqgnfq
dywnby
rgmnxg
focnto
twsnpw

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: heinle
Cipher: urvayr

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: heinle
Cipher: 325142331351

Extended Methods:
Method #1

Plaintext: heinle
method variations:
nkosqksptxvpxuycauczdhfz

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath: 
h e i n l e 
3 5 4 3 1 5 
2 1 2 3 3 1
They are then read out in rows:
354315212331
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: heinle
Cipher: xovbmc

Read more ...
Method #3

Plaintext: heinle
method variations:
wqmcxl qmcxlw mcxlwq
cxlwqm xlwqmc lwqmcx

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: heinle
all 720 cipher variations:
heinle
heinel
heilne
heilen
heieln
heienl
henile
heniel
henlie
henlei
heneli
heneil
helnie
helnei
heline
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ehline
ehlien
ehlein
ehleni
ehenli
ehenil
ehelni
ehelin
eheiln
eheinl

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


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