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orangist

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exhume

insignias

canters

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claudisque

arduousness

hushingly

congeriturque

brothers

watkin


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: doofus
cipher variations:
eppgvt fqqhwu grrixv hssjyw ittkzx
juulay kvvmbz lwwnca mxxodb nyypec
ozzqfd paarge qbbshf rcctig sddujh
teevki uffwlj vggxmk whhynl xiizom
yjjapn zkkbqo allcrp bmmdsq cnnetr

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: doofus
Cipher: wllufh

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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: doofus
Cipher: AAABB ABBAB ABBAB AABAB BAABB 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: doofus
cipher variations:
eppgvtkrrqjdqttaxnwvvklxcxxuzhizzenruddyplaffidv
ghhsrfmjjcfpsllmtzynnwhjfqqhwulssrkeruubyoxwwlmy
dyyvaijaafosveezqmbggjewhiitsgnkkdgqtmmnuazooxik
grrixvmttslfsvvczpyxxmnzezzwbjkbbgptwffarnchhkfx
ijjuthollehrunnovbappyjlhssjywnuutmgtwwdaqzyynoa
faaxcklcchquxggbsodiilgyjkkvuipmmfisvoopwcbqqzkm
ittkzxovvunhuxxebrazzopbgbbydlmddirvyhhctpejjmhz
kllwvjqnngjtwppqxdcrralnjuulaypwwvoivyyfcsbaapqc
hcczemneejswziiduqfkknialmmxwkroohkuxqqryedssbmo
kvvmbzqxxwpjwzzgdtcbbqrdiddafnoffktxajjevrgllojb
mnnyxlsppilvyrrszfettcnplwwncaryyxqkxaaheudccrse
jeebgopggluybkkfwshmmpkcnoozymtqqjmwzsstagfuudoq
mxxodbszzyrlybbifveddstfkffchpqhhmvzcllgxtinnqld
oppaznurrknxattubhgvveprnyypectaazsmzccjgwfeetug
lggdiqriinwadmmhyujoormepqqbaovssloybuuvcihwwfqs
ozzqfdubbatnaddkhxgffuvhmhhejrsjjoxbennizvkppsnf
qrrcbpwttmpzcvvwdjixxgrtpaargevccbuobeeliyhggvwi
niifkstkkpycfoojawlqqtogrssdcqxuunqadwwxekjyyhsu
qbbshfwddcvpcffmjzihhwxjojjgltullqzdgppkbxmrruph
sttedryvvorbexxyflkzzitvrcctigxeedwqdggnkajiixyk
pkkhmuvmmraehqqlcynssvqituufeszwwpscfyyzgmlaajuw
sddujhyffexrehholbkjjyzlqllinvwnnsbfirrmdzottwrj
uvvgftaxxqtdgzzahnmbbkvxteevkizggfysfiipmclkkzam
rmmjowxootcgjssneapuuxskvwwhgubyyruehaabioncclwy
uffwljahhgztgjjqndmllabnsnnkpxyppudhkttofbqvvytl
wxxihvczzsvfibbcjpoddmxzvggxmkbiihauhkkroenmmbco
toolqyzqqveiluupgcrwwzumxyyjiwdaatwgjccdkqpeenya
whhynlcjjibvillspfonncdpuppmrzarrwfjmvvqhdsxxavn
yzzkjxebbuxhkddelrqffozbxiizomdkkjcwjmmtqgpoodeq
vqqnsabssxgknwwrietyybwozaalkyfccvyileefmsrggpac
yjjapnellkdxknnurhqppefrwrrotbcttyhloxxsjfuzzcxp
abbmlzgddwzjmffgntshhqbdzkkbqofmmleyloovsirqqfgs
xsspucduuzimpyytkgvaadyqbccnmaheexakngghoutiirce
allcrpgnnmfzmppwtjsrrghtyttqvdevvajnqzzulhwbbezr
cddonbiffyblohhipvujjsdfbmmdsqhoonganqqxuktsshiu
zuurwefwwbkoraavmixccfasdeepocjggzcmpiijqwvkkteg
cnnetrippohborryvluttijvavvsxfgxxclpsbbwnjyddgbt
effqpdkhhadnqjjkrxwllufhdoofusjqqpicpsszwmvuujkw
bwwtyghyydmqtccxokzeehcufggrqeliibeorkklsyxmmvgi

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: doofus
Cipher: qbbshf

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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: doofus
Cipher: 414343125434

Extended Methods:
Method #1

Plaintext: doofus
method variations:
ittlzxoyyqectddvkhyiiapn

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
d o o f u s 
4 4 4 1 5 3 
1 3 3 2 4 4 
They are then read out in rows:
444153133244
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: doofus
Cipher: tdplht

Read more ...
Method #3

Plaintext: doofus
method variations:
qscwot scwotq cwotqs
wotqsc otqscw tqscwo

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: doofus

all 720 cipher variations:
doofus doofsu dooufs doousf doosuf doosfu dofous dofosu dofuos dofuso dofsuo
dofsou doufos doufso douofs douosf dousof dousfo dosfuo dosfou dosufo dosuof
dosouf dosofu doofus doofsu dooufs doousf doosuf doosfu dofous dofosu dofuos
dofuso dofsuo dofsou doufos doufso douofs douosf dousof dousfo dosfuo dosfou
dosufo dosuof dosouf dosofu dfoous dfoosu dfouos dfouso dfosuo dfosou dfoous
dfoosu dfouos dfouso dfosuo dfosou dfuoos dfuoso dfuoos dfuoso dfusoo dfusoo
dfsouo dfsoou dfsuoo dfsuoo dfsouo dfsoou duofos duofso duoofs duoosf duosof
duosfo dufoos dufoso dufoos dufoso dufsoo dufsoo duofos duofso duoofs duoosf
duosof duosfo dusfoo dusfoo dusofo dusoof dusoof dusofo dsofuo dsofou dsoufo
dsouof dsoouf dsoofu dsfouo dsfoou dsfuoo dsfuoo dsfouo dsfoou dsufoo dsufoo
dsuofo dsuoof dsuoof dsuofo dsofuo dsofou dsoufo dsouof dsoouf dsoofu odofus
odofsu odoufs odousf odosuf odosfu odfous odfosu odfuos odfuso odfsuo odfsou
odufos odufso oduofs oduosf odusof odusfo odsfuo odsfou odsufo odsuof odsouf
odsofu oodfus oodfsu oodufs oodusf oodsuf oodsfu oofdus oofdsu oofuds oofusd
oofsud oofsdu ooufds ooufsd ooudfs ooudsf oousdf oousfd oosfud oosfdu oosufd
oosudf oosduf oosdfu ofodus ofodsu ofouds ofousd ofosud ofosdu ofdous ofdosu
ofduos ofduso ofdsuo ofdsou ofudos ofudso ofuods ofuosd ofusod ofusdo ofsduo
ofsdou ofsudo ofsuod ofsoud ofsodu ouofds ouofsd ouodfs ouodsf ouosdf ouosfd
oufods oufosd oufdos oufdso oufsdo oufsod oudfos oudfso oudofs oudosf oudsof
oudsfo ousfdo ousfod ousdfo ousdof ousodf ousofd osofud osofdu osoufd osoudf
osoduf osodfu osfoud osfodu osfuod osfudo osfduo osfdou osufod osufdo osuofd
osuodf osudof osudfo osdfuo osdfou osdufo osduof osdouf osdofu oodfus oodfsu
oodufs oodusf oodsuf oodsfu oofdus oofdsu oofuds oofusd oofsud oofsdu ooufds
ooufsd ooudfs ooudsf oousdf oousfd oosfud oosfdu oosufd oosudf oosduf oosdfu
odofus odofsu odoufs odousf odosuf odosfu odfous odfosu odfuos odfuso odfsuo
odfsou odufos odufso oduofs oduosf odusof odusfo odsfuo odsfou odsufo odsuof
odsouf odsofu ofdous ofdosu ofduos ofduso ofdsuo ofdsou ofodus ofodsu ofouds
ofousd ofosud ofosdu ofuods ofuosd ofudos ofudso ofusdo ofusod ofsoud ofsodu
ofsuod ofsudo ofsduo ofsdou oudfos oudfso oudofs oudosf oudsof oudsfo oufdos
oufdso oufods oufosd oufsod oufsdo ouofds ouofsd ouodfs ouodsf ouosdf ouosfd
ousfod ousfdo ousofd ousodf ousdof ousdfo osdfuo osdfou osdufo osduof osdouf
osdofu osfduo osfdou osfudo osfuod osfoud osfodu osufdo osufod osudfo osudof
osuodf osuofd osofud osofdu osoufd osoudf osoduf osodfu foodus foodsu foouds
foousd foosud foosdu fodous fodosu foduos foduso fodsuo fodsou foudos foudso
fouods fouosd fousod fousdo fosduo fosdou fosudo fosuod fosoud fosodu foodus
foodsu foouds foousd foosud foosdu fodous fodosu foduos foduso fodsuo fodsou
foudos foudso fouods fouosd fousod fousdo fosduo fosdou fosudo fosuod fosoud
fosodu fdoous fdoosu fdouos fdouso fdosuo fdosou fdoous fdoosu fdouos fdouso
fdosuo fdosou fduoos fduoso fduoos fduoso fdusoo fdusoo fdsouo fdsoou fdsuoo
fdsuoo fdsouo fdsoou fuodos fuodso fuoods fuoosd fuosod fuosdo fudoos fudoso
fudoos fudoso fudsoo fudsoo fuodos fuodso fuoods fuoosd fuosod fuosdo fusdoo
fusdoo fusodo fusood fusood fusodo fsoduo fsodou fsoudo fsouod fsooud fsoodu
fsdouo fsdoou fsduoo fsduoo fsdouo fsdoou fsudoo fsudoo fsuodo fsuood fsuood
fsuodo fsoduo fsodou fsoudo fsouod fsooud fsoodu uoofds uoofsd uoodfs uoodsf
uoosdf uoosfd uofods uofosd uofdos uofdso uofsdo uofsod uodfos uodfso uodofs
uodosf uodsof uodsfo uosfdo uosfod uosdfo uosdof uosodf uosofd uoofds uoofsd
uoodfs uoodsf uoosdf uoosfd uofods uofosd uofdos uofdso uofsdo uofsod uodfos
uodfso uodofs uodosf uodsof uodsfo uosfdo uosfod uosdfo uosdof uosodf uosofd
ufoods ufoosd ufodos ufodso ufosdo ufosod ufoods ufoosd ufodos ufodso ufosdo
ufosod ufdoos ufdoso ufdoos ufdoso ufdsoo ufdsoo ufsodo ufsood ufsdoo ufsdoo
ufsodo ufsood udofos udofso udoofs udoosf udosof udosfo udfoos udfoso udfoos
udfoso udfsoo udfsoo udofos udofso udoofs udoosf udosof udosfo udsfoo udsfoo
udsofo udsoof udsoof udsofo usofdo usofod usodfo usodof usoodf usoofd usfodo
usfood usfdoo usfdoo usfodo usfood usdfoo usdfoo usdofo usdoof usdoof usdofo
usofdo usofod usodfo usodof usoodf usoofd soofud soofdu sooufd sooudf sooduf
soodfu sofoud sofodu sofuod sofudo sofduo sofdou soufod soufdo souofd souodf
soudof soudfo sodfuo sodfou sodufo soduof sodouf sodofu soofud soofdu sooufd
sooudf sooduf soodfu sofoud sofodu sofuod sofudo sofduo sofdou soufod soufdo
souofd souodf soudof soudfo sodfuo sodfou sodufo soduof sodouf sodofu sfooud
sfoodu sfouod sfoudo sfoduo sfodou sfooud sfoodu sfouod sfoudo sfoduo sfodou
sfuood sfuodo sfuood sfuodo sfudoo sfudoo sfdouo sfdoou sfduoo sfduoo sfdouo
sfdoou suofod suofdo suoofd suoodf suodof suodfo sufood sufodo sufood sufodo
sufdoo sufdoo suofod suofdo suoofd suoodf suodof suodfo sudfoo sudfoo sudofo
sudoof sudoof sudofo sdofuo sdofou sdoufo sdouof sdoouf sdoofu sdfouo sdfoou
sdfuoo sdfuoo sdfouo sdfoou sdufoo sdufoo sduofo sduoof sduoof sduofo sdofuo
sdofou sdoufo sdouof sdoouf sdoofu

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

History of cryptography
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