easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

paresi

imparadise

lepidospermae

meristically

menkes

suimate

considero

kritzer

lymphomyxoma

perocephalus

newswire

salpingian

overshadowing

lubricaque

centerward

disruptions

auntly

mulcibirian


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: arstar
cipher variations:
bstubs ctuvct duvwdu evwxev fwxyfw
gxyzgx hyzahy izabiz jabcja kbcdkb
lcdelc mdefmd nefgne ofghof pghipg
qhijqh rijkri sjklsj tklmtk ulmnul
vmnovm wnopwn xopqxo ypqryp zqrszq

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: arstar
Cipher: zihgzi

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: arstar
Cipher: AAAAA BAAAA BAAAB BAABA AAAAA 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: arstar
cipher variations:
bstubsbadgbabinsbibqxebqbyhqbybgrcbgbwlabwbevmbe
bmfybmbupkbubczwbcbkjibkctuvctcbehcbcjotcjcryfcr
czirczchsdchcxmbcxcfwncfcngzcncvqlcvcdaxcdclkjcl
duvwdudcfidcdkpudkdszgdsdajsdaditedidyncdydgxodg
dohadodwrmdwdebydedmlkdmevwxevedgjedelqveletahet
ebktebejufejezodezehypehepibepexsnexefczefenmlen
fwxyfwfehkfefmrwfmfubifufclufcfkvgfkfapefafizqfi
fqjcfqfytofyfgdafgfonmfogxyzgxgfilgfgnsxgngvcjgv
gdmvgdglwhglgbqfgbgjargjgrkdgrgzupgzghebghgpongp
hyzahyhgjmhghotyhohwdkhwhenwhehmxihmhcrghchkbshk
hslehshavqhahifchihqpohqizabizihknihipuzipixelix
ifoxifinyjinidshidilctilitmfitibwribijgdijirqpir
jabcjajilojijqvajqjyfmjyjgpyjgjozkjojetijejmdujm
jungjujcxsjcjkhejkjsrqjskbcdkbkjmpkjkrwbkrkzgnkz
khqzkhkpalkpkfujkfknevknkvohkvkdytkdklifklktsrkt
lcdelclknqlklsxclslaholaliralilqbmlqlgvklglofwlo
lwpilwlezulelmjglmlutslumdefmdmlormlmtydmtmbipmb
mjsbmjmrcnmrmhwlmhmpgxmpmxqjmxmfavmfmnkhmnmvutmv
nefgnenmpsnmnuzenuncjqncnktcnknsdonsnixmninqhynq
nyrknyngbwngnolinonwvunwofghofonqtonovafovodkrod
oludolotepotojynojorizorozslozohcxohopmjopoxwvox
pghipgporupopwbgpwpelspepmvepmpufqpupkzopkpsjaps
patmpapidypipqnkpqpyxwpyqhijqhqpsvqpqxchqxqfmtqf
qnwfqnqvgrqvqlapqlqtkbqtqbunqbqjezqjqrolqrqzyxqz
rijkrirqtwrqrydiryrgnurgroxgrorwhsrwrmbqrmrulcru
rcvorcrkfarkrspmrsrazyrasjklsjsruxsrszejszshovsh
spyhspsxitsxsncrsnsvmdsvsdwpsdslgbslstqnstsbazsb
tklmtktsvytstafktatipwtitqzitqtyjutytodstotwnetw
texqtetmhctmturotutcbatculmnulutwzutubglubujqxuj
urajuruzkvuzupetupuxofuxufyrufunidunuvspuvudcbud
vmnovmvuxavuvchmvcvkryvkvsbkvsvalwvavqfuvqvypgvy
vgzsvgvojevovwtqvwvedcvewnopwnwvybwvwdinwdwlszwl
wtclwtwbmxwbwrgvwrwzqhwzwhatwhwpkfwpwxurwxwfedwf
xopqxoxwzcxwxejoxexmtaxmxudmxuxcnyxcxshwxsxarixa
xibuxixqlgxqxyvsxyxgfexgypqrypyxadyxyfkpyfynubyn
yvenyvydozydytixytybsjybyjcvyjyrmhyryzwtyzyhgfyh
zqrszqzybezyzglqzgzovczozwfozwzepazezujyzuzctkzc
zkdwzkzsnizszaxuzazihgziarstarazcfazahmrahapwdap
axgpaxafqbafavkzavaduladalexalatojatabyvabajihaj

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: arstar
Cipher: nefgne

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: arstar
Cipher: 112434441124

Extended Methods:
Method #1

Plaintext: arstar
method variations:
fwxyfwlbcdlbqghiqgvmnovm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
a r s t a r 
1 2 3 4 1 2 
1 4 4 4 1 4 
They are then read out in rows:
123412144414
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: arstar
Cipher: fsfqtq

Read more ...
Method #3

Plaintext: arstar
method variations:
fotdfd otdfdf tdfdfo
dfdfot fdfotd dfotdf

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: arstar

all 720 cipher variations:
arstar arstra arsatr arsart arsrat arsrta artsar artsra artasr artars artras
artrsa aratsr aratrs arastr arasrt ararst ararts arrtas arrtsa arrats arrast
arrsat arrsta asrtar asrtra asratr asrart asrrat asrrta astrar astrra astarr
astarr astrar astrra asatrr asatrr asartr asarrt asarrt asartr asrtar asrtra
asratr asrart asrrat asrrta atsrar atsrra atsarr atsarr atsrar atsrra atrsar
atrsra atrasr atrars atrras atrrsa atarsr atarrs atasrr atasrr atarsr atarrs
atrras atrrsa atrars atrasr atrsar atrsra aastrr aastrr aasrtr aasrrt aasrrt
aasrtr aatsrr aatsrr aatrsr aatrrs aatrrs aatrsr aartsr aartrs aarstr aarsrt
aarrst aarrts aartrs aartsr aarrts aarrst aarsrt aarstr arstar arstra arsatr
arsart arsrat arsrta artsar artsra artasr artars artras artrsa aratsr aratrs
arastr arasrt ararst ararts arrtas arrtsa arrats arrast arrsat arrsta rastar
rastra rasatr rasart rasrat rasrta ratsar ratsra ratasr ratars ratras ratrsa
raatsr raatrs raastr raasrt raarst raarts rartas rartsa rarats rarast rarsat
rarsta rsatar rsatra rsaatr rsaart rsarat rsarta rstaar rstara rstaar rstara
rstraa rstraa rsatar rsatra rsaatr rsaart rsarat rsarta rsrtaa rsrtaa rsrata
rsraat rsraat rsrata rtsaar rtsara rtsaar rtsara rtsraa rtsraa rtasar rtasra
rtaasr rtaars rtaras rtarsa rtaasr rtaars rtasar rtasra rtarsa rtaras rtraas
rtrasa rtraas rtrasa rtrsaa rtrsaa rastar rastra rasatr rasart rasrat rasrta
ratsar ratsra ratasr ratars ratras ratrsa raatsr raatrs raastr raasrt raarst
raarts rartas rartsa rarats rarast rarsat rarsta rrstaa rrstaa rrsata rrsaat
rrsaat rrsata rrtsaa rrtsaa rrtasa rrtaas rrtaas rrtasa rratsa rratas rrasta
rrasat rraast rraats rratas rratsa rraats rraast rrasat rrasta sratar sratra
sraatr sraart srarat srarta srtaar srtara srtaar srtara srtraa srtraa sratar
sratra sraatr sraart srarat srarta srrtaa srrtaa srrata srraat srraat srrata
sartar sartra saratr sarart sarrat sarrta satrar satrra satarr satarr satrar
satrra saatrr saatrr saartr saarrt saarrt saartr sartar sartra saratr sarart
sarrat sarrta starar starra staarr staarr starar starra straar strara straar
strara strraa strraa starar starra staarr staarr starar starra strraa strraa
strara straar straar strara saatrr saatrr saartr saarrt saarrt saartr satarr
satarr satrar satrra satrra satrar sartar sartra saratr sarart sarrat sarrta
sartra sartar sarrta sarrat sarart saratr sratar sratra sraatr sraart srarat
srarta srtaar srtara srtaar srtara srtraa srtraa sratar sratra sraatr sraart
srarat srarta srrtaa srrtaa srrata srraat srraat srrata trsaar trsara trsaar
trsara trsraa trsraa trasar trasra traasr traars traras trarsa traasr traars
trasar trasra trarsa traras trraas trrasa trraas trrasa trrsaa trrsaa tsraar
tsrara tsraar tsrara tsrraa tsrraa tsarar tsarra tsaarr tsaarr tsarar tsarra
tsaarr tsaarr tsarar tsarra tsarra tsarar tsraar tsrara tsraar tsrara tsrraa
tsrraa tasrar tasrra tasarr tasarr tasrar tasrra tarsar tarsra tarasr tarars
tarras tarrsa taarsr taarrs taasrr taasrr taarsr taarrs tarras tarrsa tarars
tarasr tarsar tarsra tasarr tasarr tasrar tasrra tasrra tasrar taasrr taasrr
taarsr taarrs taarrs taarsr tarasr tarars tarsar tarsra tarrsa tarras tarars
tarasr tarras tarrsa tarsra tarsar trsaar trsara trsaar trsara trsraa trsraa
trasar trasra traasr traars traras trarsa traasr traars trasar trasra trarsa
traras trraas trrasa trraas trrasa trrsaa trrsaa arstar arstra arsatr arsart
arsrat arsrta artsar artsra artasr artars artras artrsa aratsr aratrs arastr
arasrt ararst ararts arrtas arrtsa arrats arrast arrsat arrsta asrtar asrtra
asratr asrart asrrat asrrta astrar astrra astarr astarr astrar astrra asatrr
asatrr asartr asarrt asarrt asartr asrtar asrtra asratr asrart asrrat asrrta
atsrar atsrra atsarr atsarr atsrar atsrra atrsar atrsra atrasr atrars atrras
atrrsa atarsr atarrs atasrr atasrr atarsr atarrs atrras atrrsa atrars atrasr
atrsar atrsra aastrr aastrr aasrtr aasrrt aasrrt aasrtr aatsrr aatsrr aatrsr
aatrrs aatrrs aatrsr aartsr aartrs aarstr aarsrt aarrst aarrts aartrs aartsr
aarrts aarrst aarsrt aarstr arstar arstra arsatr arsart arsrat arsrta artsar
artsra artasr artars artras artrsa aratsr aratrs arastr arasrt ararst ararts
arrtas arrtsa arrats arrast arrsat arrsta rrstaa rrstaa rrsata rrsaat rrsaat
rrsata rrtsaa rrtsaa rrtasa rrtaas rrtaas rrtasa rratsa rratas rrasta rrasat
rraast rraats rratas rratsa rraats rraast rrasat rrasta rsrtaa rsrtaa rsrata
rsraat rsraat rsrata rstraa rstraa rstara rstaar rstaar rstara rsatra rsatar
rsarta rsarat rsaart rsaatr rsatar rsatra rsaatr rsaart rsarat rsarta rtsraa
rtsraa rtsara rtsaar rtsaar rtsara rtrsaa rtrsaa rtrasa rtraas rtraas rtrasa
rtarsa rtaras rtasra rtasar rtaasr rtaars rtaras rtarsa rtaars rtaasr rtasar
rtasra rastra rastar rasrta rasrat rasart rasatr ratsra ratsar ratrsa ratras
ratars ratasr rartsa rartas rarsta rarsat rarast rarats raatrs raatsr raarts
raarst raasrt raastr rastar rastra rasatr rasart rasrat rasrta ratsar ratsra
ratasr ratars ratras ratrsa raatsr raatrs raastr raasrt raarst raarts rartas
rartsa rarats rarast rarsat rarsta

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

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