easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

unsickerness

marcovitch

choses

mltabit

inepta

profugate

zamzow

dlindstrom

westbrooke

starchman

unlight

torvi

transpicuously

epimeron

ivanitski

grandchildren

tropocaine

dorey


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: keenum
cipher variations:
lffovn mggpwo nhhqxp oiiryq pjjszr
qkktas rllubt smmvcu tnnwdv uooxew
vppyfx wqqzgy xrrahz yssbia zttcjb
auudkc bvveld cwwfme dxxgnf eyyhog
fzziph gaajqi hbbkrj icclsk jddmtl

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: keenum
Cipher: pvvmfn

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: keenum
Cipher: ABAAB AABAA AABAA ABBAA BAABB ABABB

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: keenum
cipher variations:
lffovnfnnojlzvvoxjtddolhnllozfhttondvjjopzprrodx
jzzorvdhhoftxppotrrxxohpmggpwogoopkmawwpykueepmi
ommpagiuupoewkkpqaqsspeykaapsweiipguyqqpussyypiq
nhhqxphppqlnbxxqzlvffqnjpnnqbhjvvqpfxllqrbrttqfz
lbbqtxfjjqhvzrrqvttzzqjroiiryqiqqrmocyyramwggrok
qoorcikwwrqgymmrscsuurgamccruygkkriwassrwuuaarks
pjjszrjrrsnpdzzsbnxhhsplrppsdjlxxsrhznnstdtvvshb
nddsvzhllsjxbttsxvvbbsltqkktasksstoqeaatcoyiitqm
sqqtekmyytsiaootueuwwticoeetwaimmtkycuutywwcctmu
rllubtlttuprfbbudpzjjurntrruflnzzutjbppuvfvxxujd
pffuxbjnnulzdvvuzxxddunvsmmvcumuuvqsgccveqakkvso
ussvgmoaavukcqqvwgwyyvkeqggvyckoovmaewwvayyeevow
tnnwdvnvvwrthddwfrbllwtpvttwhnpbbwvldrrwxhxzzwlf
rhhwzdlppwnbfxxwbzzffwpxuooxewowwxsuieexgscmmxuq
wuuxioqccxwmessxyiyaaxmgsiixaemqqxocgyyxcaaggxqy
vppyfxpxxytvjffyhtdnnyvrxvvyjprddyxnfttyzjzbbynh
tjjybfnrrypdhzzydbbhhyrzwqqzgyqyyzuwkggziueoozws
ywwzkqseezyoguuzakacczoiukkzcgosszqeiaazecciizsa
xrrahzrzzavxlhhajvfppaxtzxxalrtffazphvvablbddapj
vlladhpttarfjbbafddjjatbyssbiasaabwymiibkwgqqbyu
ayybmsuggbaqiwwbcmceebqkwmmbeiquubsgkccbgeekkbuc
zttcjbtbbcxznjjclxhrrczvbzzcntvhhcbrjxxcdndffcrl
xnncfjrvvcthlddchffllcvdauudkcuccdyaokkdmyissdaw
caadouwiidcskyydeoeggdsmyoodgkswwduimeediggmmdwe
bvveldvddezbpllenzjttebxdbbepvxjjedtlzzefpfhhetn
zppehltxxevjnffejhhnnexfcwwfmeweefacqmmfoakuufcy
eccfqwykkfeumaafgqgiifuoaqqfimuyyfwkoggfkiioofyg
dxxgnfxffgbdrnngpblvvgdzfddgrxzllgfvnbbghrhjjgvp
brrgjnvzzgxlphhgljjppgzheyyhogygghcesoohqcmwwhea
geehsyammhgwocchisikkhwqcsshkowaahymqiihmkkqqhai
fzziphzhhidftppirdnxxifbhffitzbnnihxpddijtjllixr
dttilpxbbiznrjjinllrribjgaajqiaiijeguqqjseoyyjgc
iggjuacoojiyqeejkukmmjyseuujmqyccjaoskkjommssjck
hbbkrjbjjkfhvrrktfpzzkhdjhhkvbdppkjzrffklvlnnkzt
fvvknrzddkbptllkpnnttkdlicclskckklgiwsslugqaalie
kiilwceqqlkasgglmwmoolaugwwlosaeelcqummlqoouulem
jddmtldllmhjxttmvhrbbmjfljjmxdfrrmlbthhmnxnppmbv
hxxmptbffmdrvnnmrppvvmfnkeenumemmnikyuunwisccnkg
mkknyegssnmcuiinoyoqqncwiyynqucggneswoonsqqwwngo

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: keenum
Cipher: xrrahz

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: keenum
Cipher: 525151335423

Extended Methods:
Method #1

Plaintext: keenum
method variations:
pkkszruppxewzuuckbezzhpg

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
k e e n u m 
5 5 5 3 5 2 
2 1 1 3 4 3 
They are then read out in rows:
555352211343
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: keenum
Cipher: zpkblo

Read more ...
Method #3

Plaintext: keenum
method variations:
wvlxix vlxixw lxixwv
xixwvl ixwvlx xwvlxi

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: keenum

all 720 cipher variations:
keenum keenmu keeunm keeumn keemun keemnu keneum kenemu kenuem kenume kenmue
kenmeu keunem keunme keuenm keuemn keumen keumne kemnue kemneu kemune kemuen
kemeun kemenu keenum keenmu keeunm keeumn keemun keemnu keneum kenemu kenuem
kenume kenmue kenmeu keunem keunme keuenm keuemn keumen keumne kemnue kemneu
kemune kemuen kemeun kemenu kneeum kneemu kneuem kneume knemue knemeu kneeum
kneemu kneuem kneume knemue knemeu knueem knueme knueem knueme knumee knumee
knmeue knmeeu knmuee knmuee knmeue knmeeu kuenem kuenme kueenm kueemn kuemen
kuemne kuneem kuneme kuneem kuneme kunmee kunmee kuenem kuenme kueenm kueemn
kuemen kuemne kumnee kumnee kumene kumeen kumeen kumene kmenue kmeneu kmeune
kmeuen kmeeun kmeenu kmneue kmneeu kmnuee kmnuee kmneue kmneeu kmunee kmunee
kmuene kmueen kmueen kmuene kmenue kmeneu kmeune kmeuen kmeeun kmeenu ekenum
ekenmu ekeunm ekeumn ekemun ekemnu ekneum eknemu eknuem eknume eknmue eknmeu
ekunem ekunme ekuenm ekuemn ekumen ekumne ekmnue ekmneu ekmune ekmuen ekmeun
ekmenu eeknum eeknmu eekunm eekumn eekmun eekmnu eenkum eenkmu eenukm eenumk
eenmuk eenmku eeunkm eeunmk eeuknm eeukmn eeumkn eeumnk eemnuk eemnku eemunk
eemukn eemkun eemknu enekum enekmu eneukm eneumk enemuk enemku enkeum enkemu
enkuem enkume enkmue enkmeu enukem enukme enuekm enuemk enumek enumke enmkue
enmkeu enmuke enmuek enmeuk enmeku euenkm euenmk eueknm euekmn euemkn euemnk
eunekm eunemk eunkem eunkme eunmke eunmek euknem euknme eukenm eukemn eukmen
eukmne eumnke eumnek eumkne eumken eumekn eumenk emenuk emenku emeunk emeukn
emekun emeknu emneuk emneku emnuek emnuke emnkue emnkeu emunek emunke emuenk
emuekn emuken emukne emknue emkneu emkune emkuen emkeun emkenu eeknum eeknmu
eekunm eekumn eekmun eekmnu eenkum eenkmu eenukm eenumk eenmuk eenmku eeunkm
eeunmk eeuknm eeukmn eeumkn eeumnk eemnuk eemnku eemunk eemukn eemkun eemknu
ekenum ekenmu ekeunm ekeumn ekemun ekemnu ekneum eknemu eknuem eknume eknmue
eknmeu ekunem ekunme ekuenm ekuemn ekumen ekumne ekmnue ekmneu ekmune ekmuen
ekmeun ekmenu enkeum enkemu enkuem enkume enkmue enkmeu enekum enekmu eneukm
eneumk enemuk enemku enuekm enuemk enukem enukme enumke enumek enmeuk enmeku
enmuek enmuke enmkue enmkeu euknem euknme eukenm eukemn eukmen eukmne eunkem
eunkme eunekm eunemk eunmek eunmke euenkm euenmk eueknm euekmn euemkn euemnk
eumnek eumnke eumenk eumekn eumken eumkne emknue emkneu emkune emkuen emkeun
emkenu emnkue emnkeu emnuke emnuek emneuk emneku emunke emunek emukne emuken
emuekn emuenk emenuk emenku emeunk emeukn emekun emeknu neekum neekmu neeukm
neeumk neemuk neemku nekeum nekemu nekuem nekume nekmue nekmeu neukem neukme
neuekm neuemk neumek neumke nemkue nemkeu nemuke nemuek nemeuk nemeku neekum
neekmu neeukm neeumk neemuk neemku nekeum nekemu nekuem nekume nekmue nekmeu
neukem neukme neuekm neuemk neumek neumke nemkue nemkeu nemuke nemuek nemeuk
nemeku nkeeum nkeemu nkeuem nkeume nkemue nkemeu nkeeum nkeemu nkeuem nkeume
nkemue nkemeu nkueem nkueme nkueem nkueme nkumee nkumee nkmeue nkmeeu nkmuee
nkmuee nkmeue nkmeeu nuekem nuekme nueekm nueemk nuemek nuemke nukeem nukeme
nukeem nukeme nukmee nukmee nuekem nuekme nueekm nueemk nuemek nuemke numkee
numkee numeke numeek numeek numeke nmekue nmekeu nmeuke nmeuek nmeeuk nmeeku
nmkeue nmkeeu nmkuee nmkuee nmkeue nmkeeu nmukee nmukee nmueke nmueek nmueek
nmueke nmekue nmekeu nmeuke nmeuek nmeeuk nmeeku ueenkm ueenmk ueeknm ueekmn
ueemkn ueemnk uenekm uenemk uenkem uenkme uenmke uenmek ueknem ueknme uekenm
uekemn uekmen uekmne uemnke uemnek uemkne uemken uemekn uemenk ueenkm ueenmk
ueeknm ueekmn ueemkn ueemnk uenekm uenemk uenkem uenkme uenmke uenmek ueknem
ueknme uekenm uekemn uekmen uekmne uemnke uemnek uemkne uemken uemekn uemenk
uneekm uneemk unekem unekme unemke unemek uneekm uneemk unekem unekme unemke
unemek unkeem unkeme unkeem unkeme unkmee unkmee unmeke unmeek unmkee unmkee
unmeke unmeek ukenem ukenme ukeenm ukeemn ukemen ukemne ukneem ukneme ukneem
ukneme uknmee uknmee ukenem ukenme ukeenm ukeemn ukemen ukemne ukmnee ukmnee
ukmene ukmeen ukmeen ukmene umenke umenek umekne umeken umeekn umeenk umneke
umneek umnkee umnkee umneke umneek umknee umknee umkene umkeen umkeen umkene
umenke umenek umekne umeken umeekn umeenk meenuk meenku meeunk meeukn meekun
meeknu meneuk meneku menuek menuke menkue menkeu meunek meunke meuenk meuekn
meuken meukne meknue mekneu mekune mekuen mekeun mekenu meenuk meenku meeunk
meeukn meekun meeknu meneuk meneku menuek menuke menkue menkeu meunek meunke
meuenk meuekn meuken meukne meknue mekneu mekune mekuen mekeun mekenu mneeuk
mneeku mneuek mneuke mnekue mnekeu mneeuk mneeku mneuek mneuke mnekue mnekeu
mnueek mnueke mnueek mnueke mnukee mnukee mnkeue mnkeeu mnkuee mnkuee mnkeue
mnkeeu muenek muenke mueenk mueekn mueken muekne muneek muneke muneek muneke
munkee munkee muenek muenke mueenk mueekn mueken muekne muknee muknee mukene
mukeen mukeen mukene mkenue mkeneu mkeune mkeuen mkeeun mkeenu mkneue mkneeu
mknuee mknuee mkneue mkneeu mkunee mkunee mkuene mkueen mkueen mkuene mkenue
mkeneu mkeune mkeuen mkeeun mkeenu

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

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