easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:



















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: libens
cipher variations:
mjcfot nkdgpu olehqv pmfirw qngjsx
rohkty spiluz tqjmva urknwb vsloxc
wtmpyd xunqze yvoraf zwpsbg axqtch
byrudi czsvej datwfk ebuxgl fcvyhm
gdwzin hexajo ifybkp jgzclq khadmr

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: libens
Cipher: oryvmh

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: libens

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: libens
cipher variations:

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: libens
Cipher: yvoraf

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: libens
Cipher: 134221513334

Extended Methods:
Method #1

Plaintext: libens
method variations:

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

Read more ...
Method #3

Plaintext: libens
method variations:
sgvlnd gvlnds vlndsg
lndsgv ndsgvl dsgvln

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: libens

all 720 cipher variations:
libens libesn libnes libnse libsne libsen liebns liebsn lienbs liensb liesnb
liesbn linebs linesb linbes linbse linsbe linseb lisenb lisebn lisneb lisnbe
lisbne lisben lbiens lbiesn lbines lbinse lbisne lbisen lbeins lbeisn lbenis
lbensi lbesni lbesin lbneis lbnesi lbnies lbnise lbnsie lbnsei lbseni lbsein
lbsnei lbsnie lbsine lbsien lebins lebisn lebnis lebnsi lebsni lebsin leibns
leibsn leinbs leinsb leisnb leisbn lenibs lenisb lenbis lenbsi lensbi lensib
lesinb lesibn lesnib lesnbi lesbni lesbin lnbeis lnbesi lnbies lnbise lnbsie
lnbsei lnebis lnebsi lneibs lneisb lnesib lnesbi lniebs lniesb lnibes lnibse
lnisbe lniseb lnseib lnsebi lnsieb lnsibe lnsbie lnsbei lsbeni lsbein lsbnei
lsbnie lsbine lsbien lsebni lsebin lsenbi lsenib lseinb lseibn lsnebi lsneib
lsnbei lsnbie lsnibe lsnieb lsienb lsiebn lsineb lsinbe lsibne lsiben ilbens
ilbesn ilbnes ilbnse ilbsne ilbsen ilebns ilebsn ilenbs ilensb ilesnb ilesbn
ilnebs ilnesb ilnbes ilnbse ilnsbe ilnseb ilsenb ilsebn ilsneb ilsnbe ilsbne
ilsben iblens iblesn iblnes iblnse iblsne iblsen ibelns ibelsn ibenls ibensl
ibesnl ibesln ibnels ibnesl ibnles ibnlse ibnsle ibnsel ibsenl ibseln ibsnel
ibsnle ibslne ibslen ieblns ieblsn iebnls iebnsl iebsnl iebsln ielbns ielbsn
ielnbs ielnsb ielsnb ielsbn ienlbs ienlsb ienbls ienbsl iensbl ienslb ieslnb
ieslbn iesnlb iesnbl iesbnl iesbln inbels inbesl inbles inblse inbsle inbsel
inebls inebsl inelbs inelsb ineslb inesbl inlebs inlesb inlbes inlbse inlsbe
inlseb inselb insebl insleb inslbe insble insbel isbenl isbeln isbnel isbnle
isblne isblen isebnl isebln isenbl isenlb iselnb iselbn isnebl isnelb isnbel
isnble isnlbe isnleb islenb islebn islneb islnbe islbne islben bilens bilesn
bilnes bilnse bilsne bilsen bielns bielsn bienls biensl biesnl biesln binels
binesl binles binlse binsle binsel bisenl biseln bisnel bisnle bislne bislen
bliens bliesn blines blinse blisne blisen bleins bleisn blenis blensi blesni
blesin blneis blnesi blnies blnise blnsie blnsei blseni blsein blsnei blsnie
blsine blsien belins belisn belnis belnsi belsni belsin beilns beilsn beinls
beinsl beisnl beisln benils benisl benlis benlsi bensli bensil besinl besiln
besnil besnli beslni beslin bnleis bnlesi bnlies bnlise bnlsie bnlsei bnelis
bnelsi bneils bneisl bnesil bnesli bniels bniesl bniles bnilse bnisle bnisel
bnseil bnseli bnsiel bnsile bnslie bnslei bsleni bslein bslnei bslnie bsline
bslien bselni bselin bsenli bsenil bseinl bseiln bsneli bsneil bsnlei bsnlie
bsnile bsniel bsienl bsieln bsinel bsinle bsilne bsilen eiblns eiblsn eibnls
eibnsl eibsnl eibsln eilbns eilbsn eilnbs eilnsb eilsnb eilsbn einlbs einlsb
einbls einbsl einsbl einslb eislnb eislbn eisnlb eisnbl eisbnl eisbln ebilns
ebilsn ebinls ebinsl ebisnl ebisln eblins eblisn eblnis eblnsi eblsni eblsin
ebnlis ebnlsi ebnils ebnisl ebnsil ebnsli ebslni ebslin ebsnli ebsnil ebsinl
ebsiln elbins elbisn elbnis elbnsi elbsni elbsin elibns elibsn elinbs elinsb
elisnb elisbn elnibs elnisb elnbis elnbsi elnsbi elnsib elsinb elsibn elsnib
elsnbi elsbni elsbin enblis enblsi enbils enbisl enbsil enbsli enlbis enlbsi
enlibs enlisb enlsib enlsbi enilbs enilsb enibls enibsl enisbl enislb enslib
enslbi ensilb ensibl ensbil ensbli esblni esblin esbnli esbnil esbinl esbiln
eslbni eslbin eslnbi eslnib eslinb eslibn esnlbi esnlib esnbli esnbil esnibl
esnilb esilnb esilbn esinlb esinbl esibnl esibln nibels nibesl nibles niblse
nibsle nibsel niebls niebsl nielbs nielsb nieslb niesbl nilebs nilesb nilbes
nilbse nilsbe nilseb niselb nisebl nisleb nislbe nisble nisbel nbiels nbiesl
nbiles nbilse nbisle nbisel nbeils nbeisl nbelis nbelsi nbesli nbesil nbleis
nblesi nblies nblise nblsie nblsei nbseli nbseil nbslei nbslie nbsile nbsiel
nebils nebisl neblis neblsi nebsli nebsil neibls neibsl neilbs neilsb neislb
neisbl nelibs nelisb nelbis nelbsi nelsbi nelsib nesilb nesibl neslib neslbi
nesbli nesbil nlbeis nlbesi nlbies nlbise nlbsie nlbsei nlebis nlebsi nleibs
nleisb nlesib nlesbi nliebs nliesb nlibes nlibse nlisbe nliseb nlseib nlsebi
nlsieb nlsibe nlsbie nlsbei nsbeli nsbeil nsblei nsblie nsbile nsbiel nsebli
nsebil nselbi nselib nseilb nseibl nslebi nsleib nslbei nslbie nslibe nslieb
nsielb nsiebl nsileb nsilbe nsible nsibel sibenl sibeln sibnel sibnle siblne
siblen siebnl siebln sienbl sienlb sielnb sielbn sinebl sinelb sinbel sinble
sinlbe sinleb silenb silebn silneb silnbe silbne silben sbienl sbieln sbinel
sbinle sbilne sbilen sbeinl sbeiln sbenil sbenli sbelni sbelin sbneil sbneli
sbniel sbnile sbnlie sbnlei sbleni sblein sblnei sblnie sbline sblien sebinl
sebiln sebnil sebnli seblni seblin seibnl seibln seinbl seinlb seilnb seilbn
senibl senilb senbil senbli senlbi senlib selinb selibn selnib selnbi selbni
selbin snbeil snbeli snbiel snbile snblie snblei snebil snebli sneibl sneilb
snelib snelbi sniebl snielb snibel snible snilbe snileb snleib snlebi snlieb
snlibe snlbie snlbei slbeni slbein slbnei slbnie slbine slbien slebni slebin
slenbi slenib sleinb sleibn slnebi slneib slnbei slnbie slnibe slnieb slienb
sliebn slineb slinbe slibne sliben

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

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