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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: komaki
cipher variations:
lpnblj mqocmk nrpdnl osqeom ptrfpn
qusgqo rvthrp swuisq txvjtr uywkus
vzxlvt waymwu xbznxv ycaoyw zdbpzx
aecqay bfdrbz cgesca dhftdb eiguec
fjhvfd gkiwge hljxhf imkyig jnlzjh

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: komaki
Cipher: plnzpr

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: komaki
Cipher: ABAAB ABBAB ABABB AAAAA ABAAB ABAAA

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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: komaki
cipher variations:
lpnbljfrlbfzztjbzptvhbtfnxfbnvhzdbhlvdzbvrpfxbph
jhvbjxdjtbdnxlrbxdrnpbrtmqocmkgsmcgaaukcaquwicug
oygcowiaecimweacwsqgycqikiwckyekuceoymscyesoqcsu
nrpdnlhtndhbbvldbrvxjdvhpzhdpxjbfdjnxfbdxtrhzdrj
ljxdlzflvdfpzntdzftprdtvosqeomiuoeiccwmecswykewi
qaieqykcgekoygceyusiaeskmkyemagmwegqaoueaguqseuw
ptrfpnjvpfjddxnfdtxzlfxjrbjfrzldhflpzhdfzvtjbftl
nlzfnbhnxfhrbpvfbhvrtfvxqusgqokwqgkeeyogeuyamgyk
sckgsameigmqaiegawukcgumomagocioygiscqwgciwsugwy
rvthrplxrhlffzphfvzbnhzltdlhtbnfjhnrbjfhbxvldhvn
pnbhpdjpzhjtdrxhdjxtvhxzswuisqmysimggaqigwacoiam
uemiucogkiosckgicywmeiwoqociqekqaikuesyiekyuwiya
txvjtrnztjnhhbrjhxbdpjbnvfnjvdphljptdlhjdzxnfjxp
rpdjrflrbjlvftzjflzvxjzbuywkusoaukoiicskiyceqkco
wgokweqimkquemikeayogkyqsqeksgmsckmwguakgmawykac
vzxlvtpbvlpjjdtljzdfrldpxhplxfrjnlrvfnjlfbzphlzr
trflthntdlnxhvblhnbxzlbdwaymwuqcwmqkkeumkaegsmeq
yiqmygskomswgokmgcaqimasusgmuiouemoyiwcmiocyamce
xbznxvrdxnrllfvnlbfhtnfrzjrnzhtlpntxhplnhdbrjnbt
vthnvjpvfnpzjxdnjpdzbndfycaoywseyosmmgwomcgiuogs
aksoaiumqouyiqmoiecskocuwuiowkqwgoqakyeokqeacoeg
zdbpzxtfzptnnhxpndhjvphtbltpbjvnrpvzjrnpjfdtlpdv
xvjpxlrxhprblzfplrfbdpfhaecqayugaquooiyqoeikwqiu
cmuqckwosqwaksoqkgeumqewywkqymsyiqscmagqmsgceqgi
bfdrbzvhbrvppjzrpfjlxrjvdnvrdlxptrxbltprlhfvnrfx
zxlrzntzjrtdnbhrnthdfrhjcgescawicswqqkasqgkmyskw
eowsemyqusycmuqsmigwosgyaymsaouaksueocisouiegsik
dhftdbxjdtxrrlbtrhlnztlxfpxtfnzrvtzdnvrtnjhxpthz
bzntbpvbltvfpdjtpvjfhtjleiguecykeuyssmcusimoaumy
gqyugoaswuaeowsuokiyquiacaoucqwcmuwgqekuqwkgiukm
fjhvfdzlfvzttndvtjnpbvnzhrzvhpbtxvbfpxtvpljzrvjb
dbpvdrxdnvxhrflvrxlhjvlngkiwgeamgwauuoewukoqcwoa
isawiqcuywcgqyuwqmkaswkcecqwesyeowyisgmwsymikwmo
hljxhfbnhxbvvpfxvlprdxpbjtbxjrdvzxdhrzvxrnlbtxld
fdrxftzfpxzjthnxtznjlxnpimkyigcoiycwwqgywmqseyqc
kucyksewayeisawysomcuymegesyguagqyakuioyuaokmyoq
jnlzjhdpjzdxxrhzxnrtfzrdlvdzltfxbzfjtbxztpndvznf
hftzhvbhrzblvjpzvbplnzprkomakieqkaeyysiayosugase
mweamugycagkucyauqoewaogiguaiwcisacmwkqawcqmoaqs

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: komaki
Cipher: xbznxv

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: komaki
Cipher: 524323115242

Extended Methods:
Method #1

Plaintext: komaki
method variations:
ptrfpouywlutzdbqzyeigved

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
k o m a k i 
5 4 2 1 5 4 
2 3 3 1 2 2 
They are then read out in rows:
542154233122
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: komaki
Cipher: ubumcg

Read more ...
Method #3

Plaintext: komaki
method variations:
rhcvrw hcvrwr cvrwrh
vrwrhc rwrhcv wrhcvr

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: komaki

all 720 cipher variations:
komaki komaik komkai komkia komika komiak koamki koamik koakmi koakim koaikm
koaimk kokami kokaim kokmai kokmia kokima kokiam koiakm koiamk koikam koikma
koimka koimak kmoaki kmoaik kmokai kmokia kmoika kmoiak kmaoki kmaoik kmakoi
kmakio kmaiko kmaiok kmkaoi kmkaio kmkoai kmkoia kmkioa kmkiao kmiako kmiaok
kmikao kmikoa kmioka kmioak kamoki kamoik kamkoi kamkio kamiko kamiok kaomki
kaomik kaokmi kaokim kaoikm kaoimk kakomi kakoim kakmoi kakmio kakimo kakiom
kaiokm kaiomk kaikom kaikmo kaimko kaimok kkmaoi kkmaio kkmoai kkmoia kkmioa
kkmiao kkamoi kkamio kkaomi kkaoim kkaiom kkaimo kkoami kkoaim kkomai kkomia
kkoima kkoiam kkiaom kkiamo kkioam kkioma kkimoa kkimao kimako kimaok kimkao
kimkoa kimoka kimoak kiamko kiamok kiakmo kiakom kiaokm kiaomk kikamo kikaom
kikmao kikmoa kikoma kikoam kioakm kioamk kiokam kiokma kiomka kiomak okmaki
okmaik okmkai okmkia okmika okmiak okamki okamik okakmi okakim okaikm okaimk
okkami okkaim okkmai okkmia okkima okkiam okiakm okiamk okikam okikma okimka
okimak omkaki omkaik omkkai omkkia omkika omkiak omakki omakik omakki omakik
omaikk omaikk omkaki omkaik omkkai omkkia omkika omkiak omiakk omiakk omikak
omikka omikka omikak oamkki oamkik oamkki oamkik oamikk oamikk oakmki oakmik
oakkmi oakkim oakikm oakimk oakkmi oakkim oakmki oakmik oakimk oakikm oaikkm
oaikmk oaikkm oaikmk oaimkk oaimkk okmaki okmaik okmkai okmkia okmika okmiak
okamki okamik okakmi okakim okaikm okaimk okkami okkaim okkmai okkmia okkima
okkiam okiakm okiamk okikam okikma okimka okimak oimakk oimakk oimkak oimkka
oimkka oimkak oiamkk oiamkk oiakmk oiakkm oiakkm oiakmk oikamk oikakm oikmak
oikmka oikkma oikkam oikakm oikamk oikkam oikkma oikmka oikmak mokaki mokaik
mokkai mokkia mokika mokiak moakki moakik moakki moakik moaikk moaikk mokaki
mokaik mokkai mokkia mokika mokiak moiakk moiakk moikak moikka moikka moikak
mkoaki mkoaik mkokai mkokia mkoika mkoiak mkaoki mkaoik mkakoi mkakio mkaiko
mkaiok mkkaoi mkkaio mkkoai mkkoia mkkioa mkkiao mkiako mkiaok mkikao mkikoa
mkioka mkioak makoki makoik makkoi makkio makiko makiok maokki maokik maokki
maokik maoikk maoikk makoki makoik makkoi makkio makiko makiok maiokk maiokk
maikok maikko maikko maikok mkkaoi mkkaio mkkoai mkkoia mkkioa mkkiao mkakoi
mkakio mkaoki mkaoik mkaiok mkaiko mkoaki mkoaik mkokai mkokia mkoika mkoiak
mkiaok mkiako mkioak mkioka mkikoa mkikao mikako mikaok mikkao mikkoa mikoka
mikoak miakko miakok miakko miakok miaokk miaokk mikako mikaok mikkao mikkoa
mikoka mikoak mioakk mioakk miokak miokka miokka miokak aomkki aomkik aomkki
aomkik aomikk aomikk aokmki aokmik aokkmi aokkim aokikm aokimk aokkmi aokkim
aokmki aokmik aokimk aokikm aoikkm aoikmk aoikkm aoikmk aoimkk aoimkk amokki
amokik amokki amokik amoikk amoikk amkoki amkoik amkkoi amkkio amkiko amkiok
amkkoi amkkio amkoki amkoik amkiok amkiko amikko amikok amikko amikok amiokk
amiokk akmoki akmoik akmkoi akmkio akmiko akmiok akomki akomik akokmi akokim
akoikm akoimk akkomi akkoim akkmoi akkmio akkimo akkiom akiokm akiomk akikom
akikmo akimko akimok akmkoi akmkio akmoki akmoik akmiok akmiko akkmoi akkmio
akkomi akkoim akkiom akkimo akokmi akokim akomki akomik akoimk akoikm akikom
akikmo akiokm akiomk akimok akimko aimkko aimkok aimkko aimkok aimokk aimokk
aikmko aikmok aikkmo aikkom aikokm aikomk aikkmo aikkom aikmko aikmok aikomk
aikokm aiokkm aiokmk aiokkm aiokmk aiomkk aiomkk komaki komaik komkai komkia
komika komiak koamki koamik koakmi koakim koaikm koaimk kokami kokaim kokmai
kokmia kokima kokiam koiakm koiamk koikam koikma koimka koimak kmoaki kmoaik
kmokai kmokia kmoika kmoiak kmaoki kmaoik kmakoi kmakio kmaiko kmaiok kmkaoi
kmkaio kmkoai kmkoia kmkioa kmkiao kmiako kmiaok kmikao kmikoa kmioka kmioak
kamoki kamoik kamkoi kamkio kamiko kamiok kaomki kaomik kaokmi kaokim kaoikm
kaoimk kakomi kakoim kakmoi kakmio kakimo kakiom kaiokm kaiomk kaikom kaikmo
kaimko kaimok kkmaoi kkmaio kkmoai kkmoia kkmioa kkmiao kkamoi kkamio kkaomi
kkaoim kkaiom kkaimo kkoami kkoaim kkomai kkomia kkoima kkoiam kkiaom kkiamo
kkioam kkioma kkimoa kkimao kimako kimaok kimkao kimkoa kimoka kimoak kiamko
kiamok kiakmo kiakom kiaokm kiaomk kikamo kikaom kikmao kikmoa kikoma kikoam
kioakm kioamk kiokam kiokma kiomka kiomak iomakk iomakk iomkak iomkka iomkka
iomkak ioamkk ioamkk ioakmk ioakkm ioakkm ioakmk iokamk iokakm iokmak iokmka
iokkma iokkam iokakm iokamk iokkam iokkma iokmka iokmak imoakk imoakk imokak
imokka imokka imokak imaokk imaokk imakok imakko imakko imakok imkaok imkako
imkoak imkoka imkkoa imkkao imkako imkaok imkkao imkkoa imkoka imkoak iamokk
iamokk iamkok iamkko iamkko iamkok iaomkk iaomkk iaokmk iaokkm iaokkm iaokmk
iakomk iakokm iakmok iakmko iakkmo iakkom iakokm iakomk iakkom iakkmo iakmko
iakmok ikmaok ikmako ikmoak ikmoka ikmkoa ikmkao ikamok ikamko ikaomk ikaokm
ikakom ikakmo ikoamk ikoakm ikomak ikomka ikokma ikokam ikkaom ikkamo ikkoam
ikkoma ikkmoa ikkmao ikmako ikmaok ikmkao ikmkoa ikmoka ikmoak ikamko ikamok
ikakmo ikakom ikaokm ikaomk ikkamo ikkaom ikkmao ikkmoa ikkoma ikkoam ikoakm
ikoamk ikokam ikokma ikomka ikomak

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

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