easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

slapjacks

sequareque

ratts

mccleery

pavin

solavisset

tournant

kluso

molliet

confuting

akkerman

doncella

debasish

slabbing

incapacitation

deionize

betulinol

caramelen


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: astors
cipher variations:
btupst cuvqtu dvwruv ewxsvw fxytwx
gyzuxy hzavyz iabwza jbcxab kcdybc
ldezcd mefade nfgbef oghcfg phidgh
qijehi rjkfij sklgjk tlmhkl umnilm
vnojmn wopkno xpqlop yqrmpq zrsnqr

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: astors
Cipher: zhglih

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: astors
Cipher: AAAAA BAAAB BAABA ABBAB BAAAA BAAAB

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: astors
cipher variations:
btupstbdgradbnstinbxevqxbhqxyhbrczgrbladwlbvmfev
bfyhmfbpkjupbzwlczbjinkjcuvqtucehsbecotujocyfwry
ciryzicsdahscmbexmcwngfwcgzingcqlkvqcaxmdackjolk
dvwruvdfitcfdpuvkpdzgxszdjszajdtebitdncfyndxohgx
dhajohdrmlwrdbynebdlkpmlewxsvwegjudgeqvwlqeahyta
ektabkeufcjueodgzoeypihyeibkpiesnmxseczofcemlqnm
fxytwxfhkvehfrwxmrfbizubflubclfvgdkvfpehapfzqjiz
fjclqjftonytfdapgdfnmrongyzuxygilwfigsxynsgcjavc
gmvcdmgwhelwgqfibqgarkjagkdmrkgupozugebqhegonspo
hzavyzhjmxgjhtyzothdkbwdhnwdenhxifmxhrgjcrhbslkb
hlenslhvqpavhfcrifhpotqpiabwzaiknyhkiuzapuielcxe
ioxefoiyjgnyishkdsictmlcimfotmiwrqbwigdsjgiqpurq
jbcxabjloziljvabqvjfmdyfjpyfgpjzkhozjtiletjdunmd
jngpunjxsrcxjhetkhjrqvsrkcdybckmpajmkwbcrwkgnezg
kqzghqkalipakujmfukevonekohqvokytsdykifuliksrwts
ldezcdlnqbknlxcdsxlhofahlrahirlbmjqblvkngvlfwpof
lpirwplzutezljgvmjltsxutmefademorclomydetymipgbi
msbijsmcnkrcmwlohwmgxqpgmqjsxqmavufamkhwnkmutyvu
nfgbefnpsdmpnzefuznjqhcjntcjktndolsdnxmpixnhyrqh
nrktyrnbwvgbnlixolnvuzwvoghcfgoqtenqoafgvaokridk
oudkluoepmteoynqjyoizsriosluzsocxwhcomjypmowvaxw
phidghpruforpbghwbplsjelpvelmvpfqnufpzorkzpjatsj
ptmvatpdyxidpnkzqnpxwbyxqijehiqsvgpsqchixcqmtkfm
qwfmnwqgrovgqapslaqkbutkqunwbuqezyjeqolaroqyxczy
rjkfijrtwhqtrdijydrnulgnrxgnoxrhspwhrbqtmbrlcvul
rvoxcvrfazkfrpmbsprzydazsklgjksuxirusejkzesovmho
syhopysitqxiscruncsmdwvmswpydwsgbalgsqnctqsazeba
tlmhkltvyjsvtfklaftpwniptzipqztjuryjtdsvodtnexwn
txqzexthcbmhtrodurtbafcbumnilmuwzktwuglmbguqxojq
uajqraukvszkuetwpeuofyxouyrafyuidcniuspevsucbgdc
vnojmnvxaluxvhmnchvrypkrvbkrsbvlwtalvfuxqfvpgzyp
vzsbgzvjedojvtqfwtvdchedwopknowybmvywinodiwszqls
wclstcwmxubmwgvyrgwqhazqwatchawkfepkwurgxuwedife
xpqlopxzcnwzxjopejxtarmtxdmtudxnyvcnxhwzshxribar
xbudibxlgfqlxvshyvxfejgfyqrmpqyadoxaykpqfkyubsnu
yenuveyozwdoyixatiysjcbsycvejcymhgrmywtizwygfkhg
zrsnqrzbepybzlqrglzvctovzfovwfzpaxepzjybujztkdct
zdwfkdznihsnzxujaxzhglihastorsacfqzcamrshmawdupw
agpwxgaqbyfqakzcvkauleduaexgleaojitoayvkbyaihmji

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: astors
Cipher: nfgbef

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: astors
Cipher: 113444432434

Extended Methods:
Method #1

Plaintext: astors
method variations:
fxytwxlcdybcqhidghvnoimn

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
a s t o r s 
1 3 4 4 2 3 
1 4 4 3 4 4 
They are then read out in rows:
134423144344
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: astors
Cipher: ltmqot

Read more ...
Method #3

Plaintext: astors
method variations:
ltthod tthodl thodlt
hodltt odltth dlttho

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: astors

all 720 cipher variations:
astors astosr astros astrso astsro astsor asotrs asotsr asorts asorst asosrt
asostr asrots asrost asrtos asrtso asrsto asrsot assort assotr assrot assrto
asstro asstor atsors atsosr atsros atsrso atssro atssor atosrs atossr atorss
atorss atosrs atossr atross atross atrsos atrsso atrsso atrsos atsors atsosr
atsros atsrso atssro atssor aotsrs aotssr aotrss aotrss aotsrs aotssr aostrs
aostsr aosrts aosrst aossrt aosstr aorsts aorsst aortss aortss aorsts aorsst
aossrt aosstr aosrst aosrts aostrs aostsr artoss artoss artsos artsso artsso
artsos arotss arotss arosts arosst arosst arosts arsots arsost arstos arstso
arssto arssot arsost arsots arssot arssto arstso arstos astors astosr astros
astrso astsro astsor asotrs asotsr asorts asorst asosrt asostr asrots asrost
asrtos asrtso asrsto asrsot assort assotr assrot assrto asstro asstor sators
satosr satros satrso satsro satsor saotrs saotsr saorts saorst saosrt saostr
sarots sarost sartos sartso sarsto sarsot sasort sasotr sasrot sasrto sastro
sastor staors staosr staros starso stasro stasor stoars stoasr storas storsa
stosra stosar stroas strosa straos straso strsao strsoa stsora stsoar stsroa
stsrao stsaro stsaor sotars sotasr sotras sotrsa sotsra sotsar soatrs soatsr
soarts soarst soasrt soastr sorats sorast sortas sortsa sorsta sorsat sosart
sosatr sosrat sosrta sostra sostar srtoas srtosa srtaos srtaso srtsao srtsoa
srotas srotsa sroats sroast srosat srosta sraots sraost sratos sratso srasto
srasot srsoat srsota srsaot srsato srstao srstoa sstora sstoar sstroa sstrao
sstaro sstaor ssotra ssotar ssorta ssorat ssoart ssoatr ssrota ssroat ssrtoa
ssrtao ssrato ssraot ssaort ssaotr ssarot ssarto ssatro ssator tsaors tsaosr
tsaros tsarso tsasro tsasor tsoars tsoasr tsoras tsorsa tsosra tsosar tsroas
tsrosa tsraos tsraso tsrsao tsrsoa tssora tssoar tssroa tssrao tssaro tssaor
tasors tasosr tasros tasrso tassro tassor taosrs taossr taorss taorss taosrs
taossr taross taross tarsos tarsso tarsso tarsos tasors tasosr tasros tasrso
tassro tassor toasrs toassr toarss toarss toasrs toassr tosars tosasr tosras
tosrsa tossra tossar torsas torssa torass torass torsas torssa tossra tossar
tosrsa tosras tosars tosasr traoss traoss trasos trasso trasso trasos troass
troass trosas trossa trossa trosas trsoas trsosa trsaos trsaso trssao trssoa
trsosa trsoas trssoa trssao trsaso trsaos tsaors tsaosr tsaros tsarso tsasro
tsasor tsoars tsoasr tsoras tsorsa tsosra tsosar tsroas tsrosa tsraos tsraso
tsrsao tsrsoa tssora tssoar tssroa tssrao tssaro tssaor ostars ostasr ostras
ostrsa ostsra ostsar osatrs osatsr osarts osarst osasrt osastr osrats osrast
osrtas osrtsa osrsta osrsat ossart ossatr ossrat ossrta osstra osstar otsars
otsasr otsras otsrsa otssra otssar otasrs otassr otarss otarss otasrs otassr
otrass otrass otrsas otrssa otrssa otrsas otsars otsasr otsras otsrsa otssra
otssar oatsrs oatssr oatrss oatrss oatsrs oatssr oastrs oastsr oasrts oasrst
oassrt oasstr oarsts oarsst oartss oartss oarsts oarsst oassrt oasstr oasrst
oasrts oastrs oastsr ortass ortass ortsas ortssa ortssa ortsas oratss oratss
orasts orasst orasst orasts orsats orsast orstas orstsa orssta orssat orsast
orsats orssat orssta orstsa orstas ostars ostasr ostras ostrsa ostsra ostsar
osatrs osatsr osarts osarst osasrt osastr osrats osrast osrtas osrtsa osrsta
osrsat ossart ossatr ossrat ossrta osstra osstar rstoas rstosa rstaos rstaso
rstsao rstsoa rsotas rsotsa rsoats rsoast rsosat rsosta rsaots rsaost rsatos
rsatso rsasto rsasot rssoat rssota rssaot rssato rsstao rsstoa rtsoas rtsosa
rtsaos rtsaso rtssao rtssoa rtosas rtossa rtoass rtoass rtosas rtossa rtaoss
rtaoss rtasos rtasso rtasso rtasos rtsoas rtsosa rtsaos rtsaso rtssao rtssoa
rotsas rotssa rotass rotass rotsas rotssa rostas rostsa rosats rosast rossat
rossta roasts roasst roatss roatss roasts roasst rossat rossta rosast rosats
rostas rostsa ratoss ratoss ratsos ratsso ratsso ratsos raotss raotss raosts
raosst raosst raosts rasots rasost rastos rastso rassto rassot rasost rasots
rassot rassto rastso rastos rstoas rstosa rstaos rstaso rstsao rstsoa rsotas
rsotsa rsoats rsoast rsosat rsosta rsaots rsaost rsatos rsatso rsasto rsasot
rssoat rssota rssaot rssato rsstao rsstoa sstora sstoar sstroa sstrao sstaro
sstaor ssotra ssotar ssorta ssorat ssoart ssoatr ssrota ssroat ssrtoa ssrtao
ssrato ssraot ssaort ssaotr ssarot ssarto ssatro ssator stsora stsoar stsroa
stsrao stsaro stsaor stosra stosar storsa storas stoars stoasr strosa stroas
strsoa strsao straso straos staors staosr staros starso stasro stasor sotsra
sotsar sotrsa sotras sotars sotasr sostra sostar sosrta sosrat sosart sosatr
sorsta sorsat sortsa sortas sorats sorast soasrt soastr soarst soarts soatrs
soatsr srtosa srtoas srtsoa srtsao srtaso srtaos srotsa srotas srosta srosat
sroast sroats srsota srsoat srstoa srstao srsato srsaot sraost sraots srasot
srasto sratso sratos sators satosr satros satrso satsro satsor saotrs saotsr
saorts saorst saosrt saostr sarots sarost sartos sartso sarsto sarsot sasort
sasotr sasrot sasrto sastro sastor

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

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