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popular ciphers:

wildcatted

anatherum

perorates

contentoque

landlubber

balley

ahern

unexasperated

jahziel

legioned

brachium

absonous

doater

overbend

gruenewald

saddleriver

garmany

mcbuff


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: bernes
cipher variations:
cfsoft dgtpgu ehuqhv fivriw gjwsjx
hkxtky ilyulz jmzvma knawnb lobxoc
mpcypd nqdzqe orearf psfbsg qtgcth
ruhdui svievj twjfwk uxkgxl vylhym
wzmizn xanjao ybokbp zcplcq adqmdr

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.)
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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: bernes
Cipher: yvimvh

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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: bernes
Cipher: AAAAB AABAA BAAAA ABBAA AABAA BAAAB

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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: bernes
cipher variations:
cfsoftenaondgviovnidqodxklyolhmtgotrqjwojlsreorv
uzmozfwhuohpypcopzaxkoxjdgtpgufobpoehwjpwojerpey
lmzpminuhpusrkxpkmtsfpswvanpagxivpiqzqdpqabylpyk
ehuqhvgpcqpfixkqxpkfsqfzmnaqnjoviqvtslyqlnutgqtx
wboqbhyjwqjrareqrbczmqzlfivriwhqdrqgjylryqlgtrga
nobrokpwjrwutmzrmovuhruyxcprcizkxrksbsfrscdanram
gjwsjxiresrhkzmszrmhushbopcsplqxksxvunasnpwvisvz
ydqsdjalysltctgstdebosbnhkxtkyjsftsilantasnivtic
pqdtqmryltywvobtoqxwjtwazertekbmztmuduhtuefcptco
ilyulzktgutjmboubtojwujdqreurnszmuzxwpcupryxkuxb
afsuflcnaunveviuvfgdqudpjmzvmaluhvukncpvcupkxvke
rsfvsotanvayxqdvqszylvycbgtvgmdobvowfwjvwgherveq
knawnbmviwvlodqwdvqlywlfstgwtpubowbzyrewrtazmwzd
chuwhnepcwpxgxkwxhifswfrlobxocnwjxwmperxewrmzxmg
tuhxuqvcpxcazsfxsubanxaedivxiofqdxqyhylxyijgtxgs
mpcypdoxkyxnqfsyfxsnaynhuviyvrwdqydbatgytvcboybf
ejwyjpgreyrzizmyzjkhuyhtnqdzqepylzyorgtzgytobzoi
vwjzwsxerzecbuhzuwdcpzcgfkxzkqhsfzsajanzaklivziu
orearfqzmazpshuahzupcapjwxkaxtyfsafdcviavxedqadh
glyalritgatbkboablmjwajvpsfbsgranbaqtivbiavqdbqk
xylbyuzgtbgedwjbwyferbeihmzbmsjuhbuclcpbcmnkxbkw
qtgcthsbocbrujwcjbwrecrlyzmczvahuchfexkcxzgfscfj
inacntkvicvdmdqcdnolyclxruhduitcpdcsvkxdkcxsfdsm
zandawbivdigfyldyahgtdgkjobdoulwjdwenerdeopmzdmy
svievjudqedtwlyeldytgetnaboebxcjwejhgzmezbihuehl
kpcepvmxkexfofsefpqnaenztwjfwkverfeuxmzfmezuhfuo
bcpfcydkxfkihanfacjivfimlqdfqwnylfygpgtfgqrobfoa
uxkgxlwfsgfvynagnfavigvpcdqgdzelygljibogbdkjwgjn
mregrxozmgzhqhughrspcgpbvylhymxgthgwzobhogbwjhwq
derheafmzhmkjcphcelkxhkonsfhsypanhairivhistqdhqc
wzmiznyhuihxapciphcxkixrefsifbgnainlkdqidfmlyilp
otgitzqboibjsjwijtureirdxanjaozivjiybqdjqidyljys
fgtjgchobjomlerjegnmzjmqpuhjuarcpjcktkxjkuvsfjse
ybokbpajwkjzcrekrjezmkztghukhdipckpnmfskfhonaknr
qvikvbsdqkdlulyklvwtgktfzcplcqbkxlkadsflskfanlau
hivliejqdlqongtlgipoblosrwjlwcterlemvmzlmwxuhlug
adqmdrclymlbetgmtlgbombvijwmjfkremrpohumhjqpcmpt
sxkmxdufsmfnwnamnxyvimvhbernesdmznmcfuhnumhcpncw
jkxnkglsfnsqpivnikrqdnqutylnyevgtngoxobnoyzwjnwi

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,

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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: bernes
Cipher: orearf

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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: bernes
Cipher: 215124335134

Extended Methods:
Method #1

Plaintext: bernes
method variations:
gkwskxmpbxpcrugcuhwzmhzn

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
b e r n e s 
2 5 2 3 5 3 
1 1 4 3 1 4 
They are then read out in rows:
252353114314
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: bernes
Cipher: wmpaoq

Read more ...
Method #3

Plaintext: bernes
method variations:
vfoxli foxliv oxlivf
xlivfo livfox ivfoxl

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: bernes

all 720 cipher variations:
bernes bernse berens beresn bersen bersne benres benrse beners benesr benser
bensre beenrs beensr beerns beersn beesrn beesnr besner besnre besenr besern
besren besrne brenes brense breens breesn bresen bresne brnees brnese brnees
brnese brnsee brnsee brenes brense breens breesn bresen bresne brsnee brsnee
brsene brseen brseen brsene bnrees bnrese bnrees bnrese bnrsee bnrsee bneres
bnerse bneers bneesr bneser bnesre bneers bneesr bneres bnerse bnesre bneser
bnseer bnsere bnseer bnsere bnsree bnsree bernes bernse berens beresn bersen
bersne benres benrse beners benesr benser bensre beenrs beensr beerns beersn
beesrn beesnr besner besnre besenr besern besren besrne bsrnee bsrnee bsrene
bsreen bsreen bsrene bsnree bsnree bsnere bsneer bsneer bsnere bsenre bsener
bserne bseren bseern bseenr bsener bsenre bseenr bseern bseren bserne ebrnes
ebrnse ebrens ebresn ebrsen ebrsne ebnres ebnrse ebners ebnesr ebnser ebnsre
ebenrs ebensr eberns ebersn ebesrn ebesnr ebsner ebsnre ebsenr ebsern ebsren
ebsrne erbnes erbnse erbens erbesn erbsen erbsne ernbes ernbse ernebs ernesb
ernseb ernsbe erenbs erensb erebns erebsn eresbn eresnb ersneb ersnbe ersenb
ersebn ersben ersbne enrbes enrbse enrebs enresb enrseb enrsbe enbres enbrse
enbers enbesr enbser enbsre enebrs enebsr enerbs enersb enesrb enesbr ensber
ensbre ensebr enserb ensreb ensrbe eernbs eernsb eerbns eerbsn eersbn eersnb
eenrbs eenrsb eenbrs eenbsr eensbr eensrb eebnrs eebnsr eebrns eebrsn eebsrn
eebsnr eesnbr eesnrb eesbnr eesbrn eesrbn eesrnb esrneb esrnbe esrenb esrebn
esrben esrbne esnreb esnrbe esnerb esnebr esnber esnbre esenrb esenbr esernb
eserbn esebrn esebnr esbner esbnre esbenr esbern esbren esbrne rebnes rebnse
rebens rebesn rebsen rebsne renbes renbse renebs renesb renseb rensbe reenbs
reensb reebns reebsn reesbn reesnb resneb resnbe resenb resebn resben resbne
rbenes rbense rbeens rbeesn rbesen rbesne rbnees rbnese rbnees rbnese rbnsee
rbnsee rbenes rbense rbeens rbeesn rbesen rbesne rbsnee rbsnee rbsene rbseen
rbseen rbsene rnbees rnbese rnbees rnbese rnbsee rnbsee rnebes rnebse rneebs
rneesb rneseb rnesbe rneebs rneesb rnebes rnebse rnesbe rneseb rnseeb rnsebe
rnseeb rnsebe rnsbee rnsbee rebnes rebnse rebens rebesn rebsen rebsne renbes
renbse renebs renesb renseb rensbe reenbs reensb reebns reebsn reesbn reesnb
resneb resnbe resenb resebn resben resbne rsbnee rsbnee rsbene rsbeen rsbeen
rsbene rsnbee rsnbee rsnebe rsneeb rsneeb rsnebe rsenbe rseneb rsebne rseben
rseebn rseenb rseneb rsenbe rseenb rseebn rseben rsebne nerbes nerbse nerebs
neresb nerseb nersbe nebres nebrse nebers nebesr nebser nebsre neebrs neebsr
neerbs neersb neesrb neesbr nesber nesbre nesebr neserb nesreb nesrbe nrebes
nrebse nreebs nreesb nreseb nresbe nrbees nrbese nrbees nrbese nrbsee nrbsee
nrebes nrebse nreebs nreesb nreseb nresbe nrsbee nrsbee nrsebe nrseeb nrseeb
nrsebe nbrees nbrese nbrees nbrese nbrsee nbrsee nberes nberse nbeers nbeesr
nbeser nbesre nbeers nbeesr nberes nberse nbesre nbeser nbseer nbsere nbseer
nbsere nbsree nbsree nerbes nerbse nerebs neresb nerseb nersbe nebres nebrse
nebers nebesr nebser nebsre neebrs neebsr neerbs neersb neesrb neesbr nesber
nesbre nesebr neserb nesreb nesrbe nsrbee nsrbee nsrebe nsreeb nsreeb nsrebe
nsbree nsbree nsbere nsbeer nsbeer nsbere nsebre nseber nserbe nsereb nseerb
nseebr nseber nsebre nseebr nseerb nsereb nserbe eernbs eernsb eerbns eerbsn
eersbn eersnb eenrbs eenrsb eenbrs eenbsr eensbr eensrb eebnrs eebnsr eebrns
eebrsn eebsrn eebsnr eesnbr eesnrb eesbnr eesbrn eesrbn eesrnb erenbs erensb
erebns erebsn eresbn eresnb ernebs ernesb ernbes ernbse ernsbe ernseb erbnes
erbnse erbens erbesn erbsen erbsne ersnbe ersneb ersbne ersben ersebn ersenb
enrebs enresb enrbes enrbse enrsbe enrseb enerbs enersb enebrs enebsr enesbr
enesrb enbers enbesr enbres enbrse enbsre enbser ensebr enserb ensber ensbre
ensrbe ensreb ebrnes ebrnse ebrens ebresn ebrsen ebrsne ebnres ebnrse ebners
ebnesr ebnser ebnsre ebenrs ebensr eberns ebersn ebesrn ebesnr ebsner ebsnre
ebsenr ebsern ebsren ebsrne esrnbe esrneb esrbne esrben esrebn esrenb esnrbe
esnreb esnbre esnber esnebr esnerb esbnre esbner esbrne esbren esbern esbenr
esenbr esenrb esebnr esebrn eserbn esernb serneb sernbe serenb serebn serben
serbne senreb senrbe senerb senebr senber senbre seenrb seenbr seernb seerbn
seebrn seebnr sebner sebnre sebenr sebern sebren sebrne sreneb srenbe sreenb
sreebn sreben srebne srneeb srnebe srneeb srnebe srnbee srnbee sreneb srenbe
sreenb sreebn sreben srebne srbnee srbnee srbene srbeen srbeen srbene snreeb
snrebe snreeb snrebe snrbee snrbee snereb snerbe sneerb sneebr sneber snebre
sneerb sneebr snereb snerbe snebre sneber snbeer snbere snbeer snbere snbree
snbree serneb sernbe serenb serebn serben serbne senreb senrbe senerb senebr
senber senbre seenrb seenbr seernb seerbn seebrn seebnr sebner sebnre sebenr
sebern sebren sebrne sbrnee sbrnee sbrene sbreen sbreen sbrene sbnree sbnree
sbnere sbneer sbneer sbnere sbenre sbener sberne sberen sbeern sbeenr sbener
sbenre sbeenr sbeern sberen sberne

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

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