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: solvit
cipher variations:
tpmwju uqnxkv vroylw wspzmx xtqany
yurboz zvscpa awtdqb bxuerc cyvfsd
dzwgte eaxhuf fbyivg gczjwh hdakxi
ieblyj jfcmzk kgdnal lheobm mifpcn
njgqdo okhrep plisfq qmjtgr rnkuhs

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: solvit
Cipher: hloerg

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: solvit

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: solvit
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: solvit
Cipher: fbyivg

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: solvit
Cipher: 344313154244

Extended Methods:
Method #1

Plaintext: solvit
method variations:

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
s o l v i t 
3 4 1 1 4 4 
4 3 3 5 2 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: solvit
Cipher: satoxr

Read more ...
Method #3

Plaintext: solvit
method variations:
tccuro ccurot curotc
urotcc rotccu otccur

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: solvit

all 720 cipher variations:
solvit solvti solivt solitv soltiv soltvi sovlit sovlti sovilt sovitl sovtil
sovtli soivlt soivtl soilvt soiltv soitlv soitvl sotvil sotvli sotivl sotilv
sotliv sotlvi slovit slovti sloivt sloitv slotiv slotvi slvoit slvoti slviot
slvito slvtio slvtoi slivot slivto sliovt sliotv slitov slitvo sltvio sltvoi
sltivo sltiov sltoiv sltovi svloit svloti svliot svlito svltio svltoi svolit
svolti svoilt svoitl svotil svotli sviolt sviotl svilot svilto svitlo svitol
svtoil svtoli svtiol svtilo svtlio svtloi silvot silvto silovt silotv siltov
siltvo sivlot sivlto sivolt sivotl sivtol sivtlo siovlt siovtl siolvt sioltv
siotlv siotvl sitvol sitvlo sitovl sitolv sitlov sitlvo stlvio stlvoi stlivo
stliov stloiv stlovi stvlio stvloi stvilo stviol stvoil stvoli stivlo stivol
stilvo stilov stiolv stiovl stovil stovli stoivl stoilv stoliv stolvi oslvit
oslvti oslivt oslitv osltiv osltvi osvlit osvlti osvilt osvitl osvtil osvtli
osivlt osivtl osilvt osiltv ositlv ositvl ostvil ostvli ostivl ostilv ostliv
ostlvi olsvit olsvti olsivt olsitv olstiv olstvi olvsit olvsti olvist olvits
olvtis olvtsi olivst olivts olisvt olistv olitsv olitvs oltvis oltvsi oltivs
oltisv oltsiv oltsvi ovlsit ovlsti ovlist ovlits ovltis ovltsi ovslit ovslti
ovsilt ovsitl ovstil ovstli ovislt ovistl ovilst ovilts ovitls ovitsl ovtsil
ovtsli ovtisl ovtils ovtlis ovtlsi oilvst oilvts oilsvt oilstv oiltsv oiltvs
oivlst oivlts oivslt oivstl oivtsl oivtls oisvlt oisvtl oislvt oisltv oistlv
oistvl oitvsl oitvls oitsvl oitslv oitlsv oitlvs otlvis otlvsi otlivs otlisv
otlsiv otlsvi otvlis otvlsi otvils otvisl otvsil otvsli otivls otivsl otilvs
otilsv otislv otisvl otsvil otsvli otsivl otsilv otsliv otslvi losvit losvti
losivt lositv lostiv lostvi lovsit lovsti lovist lovits lovtis lovtsi loivst
loivts loisvt loistv loitsv loitvs lotvis lotvsi lotivs lotisv lotsiv lotsvi
lsovit lsovti lsoivt lsoitv lsotiv lsotvi lsvoit lsvoti lsviot lsvito lsvtio
lsvtoi lsivot lsivto lsiovt lsiotv lsitov lsitvo lstvio lstvoi lstivo lstiov
lstoiv lstovi lvsoit lvsoti lvsiot lvsito lvstio lvstoi lvosit lvosti lvoist
lvoits lvotis lvotsi lviost lviots lvisot lvisto lvitso lvitos lvtois lvtosi
lvtios lvtiso lvtsio lvtsoi lisvot lisvto lisovt lisotv listov listvo livsot
livsto livost livots livtos livtso liovst liovts liosvt liostv liotsv liotvs
litvos litvso litovs litosv litsov litsvo ltsvio ltsvoi ltsivo ltsiov ltsoiv
ltsovi ltvsio ltvsoi ltviso ltvios ltvois ltvosi ltivso ltivos ltisvo ltisov
ltiosv ltiovs ltovis ltovsi ltoivs ltoisv ltosiv ltosvi volsit volsti volist
volits voltis voltsi voslit voslti vosilt vositl vostil vostli voislt voistl
voilst voilts voitls voitsl votsil votsli votisl votils votlis votlsi vlosit
vlosti vloist vloits vlotis vlotsi vlsoit vlsoti vlsiot vlsito vlstio vlstoi
vlisot vlisto vliost vliots vlitos vlitso vltsio vltsoi vltiso vltios vltois
vltosi vsloit vsloti vsliot vslito vsltio vsltoi vsolit vsolti vsoilt vsoitl
vsotil vsotli vsiolt vsiotl vsilot vsilto vsitlo vsitol vstoil vstoli vstiol
vstilo vstlio vstloi vilsot vilsto vilost vilots viltos viltso vislot vislto
visolt visotl vistol vistlo vioslt viostl violst violts viotls viotsl vitsol
vitslo vitosl vitols vitlos vitlso vtlsio vtlsoi vtliso vtlios vtlois vtlosi
vtslio vtsloi vtsilo vtsiol vtsoil vtsoli vtislo vtisol vtilso vtilos vtiols
vtiosl vtosil vtosli vtoisl vtoils vtolis vtolsi iolvst iolvts iolsvt iolstv
ioltsv ioltvs iovlst iovlts iovslt iovstl iovtsl iovtls iosvlt iosvtl ioslvt
iosltv iostlv iostvl iotvsl iotvls iotsvl iotslv iotlsv iotlvs ilovst ilovts
ilosvt ilostv ilotsv ilotvs ilvost ilvots ilvsot ilvsto ilvtso ilvtos ilsvot
ilsvto ilsovt ilsotv ilstov ilstvo iltvso iltvos iltsvo iltsov iltosv iltovs
ivlost ivlots ivlsot ivlsto ivltso ivltos ivolst ivolts ivoslt ivostl ivotsl
ivotls ivsolt ivsotl ivslot ivslto ivstlo ivstol ivtosl ivtols ivtsol ivtslo
ivtlso ivtlos islvot islvto islovt islotv isltov isltvo isvlot isvlto isvolt
isvotl isvtol isvtlo isovlt isovtl isolvt isoltv isotlv isotvl istvol istvlo
istovl istolv istlov istlvo itlvso itlvos itlsvo itlsov itlosv itlovs itvlso
itvlos itvslo itvsol itvosl itvols itsvlo itsvol itslvo itslov itsolv itsovl
itovsl itovls itosvl itoslv itolsv itolvs tolvis tolvsi tolivs tolisv tolsiv
tolsvi tovlis tovlsi tovils tovisl tovsil tovsli toivls toivsl toilvs toilsv
toislv toisvl tosvil tosvli tosivl tosilv tosliv toslvi tlovis tlovsi tloivs
tloisv tlosiv tlosvi tlvois tlvosi tlvios tlviso tlvsio tlvsoi tlivos tlivso
tliovs tliosv tlisov tlisvo tlsvio tlsvoi tlsivo tlsiov tlsoiv tlsovi tvlois
tvlosi tvlios tvliso tvlsio tvlsoi tvolis tvolsi tvoils tvoisl tvosil tvosli
tviols tviosl tvilos tvilso tvislo tvisol tvsoil tvsoli tvsiol tvsilo tvslio
tvsloi tilvos tilvso tilovs tilosv tilsov tilsvo tivlos tivlso tivols tivosl
tivsol tivslo tiovls tiovsl tiolvs tiolsv tioslv tiosvl tisvol tisvlo tisovl
tisolv tislov tislvo tslvio tslvoi tslivo tsliov tsloiv tslovi tsvlio tsvloi
tsvilo tsviol tsvoil tsvoli tsivlo tsivol tsilvo tsilov tsiolv tsiovl tsovil
tsovli tsoivl tsoilv tsoliv tsolvi

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

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