easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

winterberg

wakerife

wildenhain

misteacher

mapach

hassig

testaceum

poshard

aplacental

predeceaser

uslab

bucyrus

youngling

lantis

akermanite

typhobacillosis

virgile

wpafb


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: rigour
cipher variations:
sjhpvs tkiqwt uljrxu vmksyv wnltzw
xomuax ypnvby zqowcz arpxda bsqyeb
ctrzfc dusagd evtbhe fwucif gxvdjg
hywekh izxfli jaygmj kbzhnk lcaiol
mdbjpm neckqn ofdlro pgemsp qhfntq

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: rigour
Cipher: irtlfi

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: rigour
Cipher: BAAAA ABAAA AABBA ABBAB BAABB 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: rigour
cipher variations:
sjhpvsaztrjaipftxiqfrvlqyvdxzyglpzngwrndpwehzfde
mxlhrmunxjfucdjltcktvnhktkiqwtbauskbjqguyjrgswmr
zweyazhmqaohxsoeqxfiagefnymisnvoykgvdekmudluwoil
uljrxucbvtlckrhvzkshtxnsaxfzbainrbpiytpfrygjbhfg
oznjtowpzlhweflnvemvxpjmvmksyvdcwumdlsiwaltiuyot
bygacbjoscqjzuqgszhkcighpaokupxqamixfgmowfnwyqkn
wnltzwedxvnemtjxbmujvzpuczhbdckptdrkavrhtaildjhi
qbplvqyrbnjyghnpxgoxzrloxomuaxfeywofnukycnvkwaqv
daicedlqueslbwsiubjmekijrcqmwrzscokzhioqyhpyasmp
ypnvbygfzxpgovlzdowlxbrwebjdfemrvftmcxtjvcknfljk
sdrnxsatdplaijprziqzbtnqzqowczhgayqhpwmaepxmycsx
fckegfnswgundyukwdlogmkltesoytbueqmbjkqsajracuor
arpxdaihbzriqxnbfqynzdtygdlfhgotxhvoezvlxemphnlm
uftpzucvfrncklrtbksbdvpsbsqyebjicasjryocgrzoaeuz
hemgihpuyiwpfawmyfnqiomnvguqavdwgsodlmsucltcewqt
ctrzfckjdbtkszpdhsapbfvaifnhjiqvzjxqgbxnzgorjpno
whvrbwexhtpemntvdmudfxrudusagdlkecultaqeitbqcgwb
jgoikjrwakyrhcyoahpskqopxiwscxfyiuqfnouwenvegysv
evtbhemlfdvmubrfjucrdhxckhpjlksxblzsidzpbiqtlrpq
yjxtdygzjvrgopvxfowfhztwfwucifnmgewnvcsgkvdseiyd
liqkmltycmatjeaqcjrumsqrzkyuezhakwshpqwygpxgiaux
gxvdjgonhfxowdthlwetfjzemjrlnmuzdnbukfbrdksvntrs
alzvfaiblxtiqrxzhqyhjbvyhywekhpoigypxeuimxfugkaf
nksmonvaeocvlgcseltwoustbmawgbjcmyujrsyairzikcwz
izxfliqpjhzqyfvjnygvhlbgoltnpowbfpdwmhdtfmuxpvtu
cnbxhckdnzvkstzbjsajldxajaygmjrqkiarzgwkozhwimch
pmuoqpxcgqexnieugnvyqwuvdocyidleoawltuacktbkmeyb
kbzhnksrljbsahxlpaixjndiqnvprqydhrfyojfvhowzrxvw
epdzjemfpbxmuvbdluclnfzclcaioltsmkctbiymqbjykoej
rowqsrzeisgzpkgwipxasywxfqeakfngqcynvwcemvdmogad
mdbjpmutnlducjznrckzlpfkspxrtsafjthaqlhxjqybtzxy
grfblgohrdzowxdfnwenphbeneckqnvuomevdkaosdlamqgl
tqysutbgkuibrmiykrzcuayzhsgcmhpiseapxyegoxfoqicf
ofdlrowvpnfwelbptembnrhmurztvuchlvjcsnjzlsadvbza
ithdniqjtfbqyzfhpygprjdgpgemspxwqogxfmcqufncosin
vsauwvdimwkdtokamtbewcabjuieojrkugcrzagiqzhqskeh
qhfntqyxrphygndrvgodptjowtbvxwejnxleuplbnucfxdbc
kvjfpkslvhdsabhjrairtlfirigourzysqizhoeswhpequkp
xucwyxfkoymfvqmcovdgyecdlwkgqltmwietbciksbjsumgj

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: rigour
Cipher: evtbhe

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: rigour
Cipher: 244222435424

Extended Methods:
Method #1

Plaintext: rigour
method variations:
womtzwbtryebgywdkgmdbipm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
r i g o u r 
2 4 2 4 5 2 
4 2 2 3 4 4 
They are then read out in rows:
242452422344
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: rigour
Cipher: rrkimt

Read more ...
Method #3

Plaintext: rigour
method variations:
tgrxii grxiit rxiitg
xiitgr iitgrx itgrxi

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: rigour

all 720 cipher variations:
rigour rigoru riguor riguro rigruo rigrou riogur riogru riougr riourg riorug
riorgu riuogr riuorg riugor riugro riurgo riurog riroug rirogu riruog rirugo
rirguo rirgou rgiour rgioru rgiuor rgiuro rgiruo rgirou rgoiur rgoiru rgouir
rgouri rgorui rgoriu rguoir rguori rguior rguiro rgurio rguroi rgroui rgroiu
rgruoi rgruio rgriuo rgriou rogiur rogiru roguir roguri rogrui rogriu roigur
roigru roiugr roiurg roirug roirgu rouigr rouirg rougir rougri rourgi rourig
roriug rorigu roruig rorugi rorgui rorgiu rugoir rugori rugior rugiro rugrio
rugroi ruogir ruogri ruoigr ruoirg ruorig ruorgi ruiogr ruiorg ruigor ruigro
ruirgo ruirog ruroig rurogi ruriog rurigo rurgio rurgoi rrgoui rrgoiu rrguoi
rrguio rrgiuo rrgiou rrogui rrogiu rrougi rrouig rroiug rroigu rruogi rruoig
rrugoi rrugio rruigo rruiog rrioug rriogu rriuog rriugo rriguo rrigou irgour
irgoru irguor irguro irgruo irgrou irogur irogru irougr irourg irorug irorgu
iruogr iruorg irugor irugro irurgo irurog irroug irrogu irruog irrugo irrguo
irrgou igrour igroru igruor igruro igrruo igrrou igorur igorru igourr igourr
igorur igorru iguorr iguorr iguror igurro igurro iguror igrour igroru igruor
igruro igrruo igrrou iogrur iogrru iogurr iogurr iogrur iogrru iorgur iorgru
iorugr iorurg iorrug iorrgu iourgr iourrg iougrr iougrr iourgr iourrg iorrug
iorrgu iorurg iorugr iorgur iorgru iugorr iugorr iugror iugrro iugrro iugror
iuogrr iuogrr iuorgr iuorrg iuorrg iuorgr iurogr iurorg iurgor iurgro iurrgo
iurrog iurorg iurogr iurrog iurrgo iurgro iurgor irgour irgoru irguor irguro
irgruo irgrou irogur irogru irougr irourg irorug irorgu iruogr iruorg irugor
irugro irurgo irurog irroug irrogu irruog irrugo irrguo irrgou girour giroru
giruor giruro girruo girrou giorur giorru giourr giourr giorur giorru giuorr
giuorr giuror giurro giurro giuror girour giroru giruor giruro girruo girrou
griour grioru griuor griuro griruo grirou groiur groiru grouir grouri grorui
groriu gruoir gruori gruior gruiro grurio gruroi grroui grroiu grruoi grruio
grriuo grriou goriur goriru goruir goruri gorrui gorriu goirur goirru goiurr
goiurr goirur goirru gouirr gouirr gourir gourri gourri gourir goriur goriru
goruir goruri gorrui gorriu guroir gurori gurior guriro gurrio gurroi guorir
guorri guoirr guoirr guorir guorri guiorr guiorr guiror guirro guirro guiror
guroir gurori gurior guriro gurrio gurroi grroui grroiu grruoi grruio grriuo
grriou grorui groriu grouri grouir groiur groiru gruori gruoir gruroi grurio
gruiro gruior griour grioru griuor griuro griruo grirou oigrur oigrru oigurr
oigurr oigrur oigrru oirgur oirgru oirugr oirurg oirrug oirrgu oiurgr oiurrg
oiugrr oiugrr oiurgr oiurrg oirrug oirrgu oirurg oirugr oirgur oirgru ogirur
ogirru ogiurr ogiurr ogirur ogirru ogriur ogriru ogruir ogruri ogrrui ogrriu
ogurir ogurri oguirr oguirr ogurir ogurri ogrrui ogrriu ogruri ogruir ogriur
ogriru orgiur orgiru orguir orguri orgrui orgriu origur origru oriugr oriurg
orirug orirgu oruigr oruirg orugir orugri orurgi orurig orriug orrigu orruig
orrugi orrgui orrgiu ougrir ougrri ougirr ougirr ougrir ougrri ourgir ourgri
ourigr ourirg ourrig ourrgi ouirgr ouirrg ouigrr ouigrr ouirgr ouirrg ourrig
ourrgi ourirg ourigr ourgir ourgri orgrui orgriu orguri orguir orgiur orgiru
orrgui orrgiu orrugi orruig orriug orrigu orurgi orurig orugri orugir oruigr
oruirg orirug orirgu oriurg oriugr origur origru uigorr uigorr uigror uigrro
uigrro uigror uiogrr uiogrr uiorgr uiorrg uiorrg uiorgr uirogr uirorg uirgor
uirgro uirrgo uirrog uirorg uirogr uirrog uirrgo uirgro uirgor ugiorr ugiorr
ugiror ugirro ugirro ugiror ugoirr ugoirr ugorir ugorri ugorri ugorir ugroir
ugrori ugrior ugriro ugrrio ugrroi ugrori ugroir ugrroi ugrrio ugriro ugrior
uogirr uogirr uogrir uogrri uogrri uogrir uoigrr uoigrr uoirgr uoirrg uoirrg
uoirgr uorigr uorirg uorgir uorgri uorrgi uorrig uorirg uorigr uorrig uorrgi
uorgri uorgir urgoir urgori urgior urgiro urgrio urgroi urogir urogri uroigr
uroirg urorig urorgi uriogr uriorg urigor urigro urirgo urirog urroig urrogi
urriog urrigo urrgio urrgoi urgori urgoir urgroi urgrio urgiro urgior urogri
urogir urorgi urorig uroirg uroigr urrogi urroig urrgoi urrgio urrigo urriog
uriorg uriogr urirog urirgo urigro urigor rigour rigoru riguor riguro rigruo
rigrou riogur riogru riougr riourg riorug riorgu riuogr riuorg riugor riugro
riurgo riurog riroug rirogu riruog rirugo rirguo rirgou rgiour rgioru rgiuor
rgiuro rgiruo rgirou rgoiur rgoiru rgouir rgouri rgorui rgoriu rguoir rguori
rguior rguiro rgurio rguroi rgroui rgroiu rgruoi rgruio rgriuo rgriou rogiur
rogiru roguir roguri rogrui rogriu roigur roigru roiugr roiurg roirug roirgu
rouigr rouirg rougir rougri rourgi rourig roriug rorigu roruig rorugi rorgui
rorgiu rugoir rugori rugior rugiro rugrio rugroi ruogir ruogri ruoigr ruoirg
ruorig ruorgi ruiogr ruiorg ruigor ruigro ruirgo ruirog ruroig rurogi ruriog
rurigo rurgio rurgoi rrgoui rrgoiu rrguoi rrguio rrgiuo rrgiou rrogui rrogiu
rrougi rrouig rroiug rroigu rruogi rruoig rrugoi rrugio rruigo rruiog rrioug
rriogu rriuog rriugo rriguo rrigou

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

History of cryptography
2011 Easy Ciphers. All rights reserved. contact us