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postocular

rounders

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unenthusiastically


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: slepez
cipher variations:
tmfqfa ungrgb vohshc wpitid xqjuje
yrkvkf zslwlg atmxmh bunyni cvozoj
dwpapk exqbql fyrcrm gzsdsn hateto
ibufup jcvgvq kdwhwr lexixs mfyjyt
ngzkzu ohalav pibmbw qjcncx rkdody

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: slepez
Cipher: hovkva

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: slepez
Cipher: BAAAB ABABA AABAA ABBBA AABAA BABBB

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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: slepez
cipher variations:
tmfqfadinunynevyvwxadcduhwlglsrstktqlkjsjmvgrwrk
fczazipyhehgzupipejqxmxcungrgbejovozofwzwxybedev
ixmhmtstulurmlktknwhsxslgdabajqzifihavqjqfkrynyd
vohshcfkpwpapgxaxyzcfefwjyninutuvmvsnmluloxitytm
hebcbkrajgjibwrkrglszozewpitidglqxqbqhybyzadgfgx
kzojovuvwnwtonmvmpyjuzunifcdclsbkhkjcxslshmtapaf
xqjujehmryrcrizczabehghylapkpwvwxoxuponwnqzkvavo
jgdedmtclilkdytmtinubqbgyrkvkfinszsdsjadabcfihiz
mbqlqxwxypyvqpoxoralwbwpkhefenudmjmlezunujovcrch
zslwlgjotatetkbebcdgjijancrmryxyzqzwrqpypsbmxcxq
lifgfovenknmfavovkpwdsdiatmxmhkpubufulcfcdehkjkb
odsnszyzaraxsrqzqtcnydyrmjghgpwfolongbwpwlqxetej
bunynilqvcvgvmdgdefilklcpetotazabsbytsrarudozezs
nkhihqxgpmpohcxqxmryfufkcvozojmrwdwhwnehefgjmlmd
qfupubabctczutsbsvepafatolijiryhqnqpidyrynszgvgl
dwpapknsxexixofifghknmnergvqvcbcdudavutctwfqbgbu
pmjkjszirorqjezszotahwhmexqbqlotyfyjypgjghilonof
shwrwdcdevebwvuduxgrchcvqnklktajspsrkfatapubixin
fyrcrmpuzgzkzqhkhijmpopgtixsxedefwfcxwvevyhsdidw
rolmlubktqtslgbubqvcjyjogzsdsnqvahalarilijknqpqh
ujytyfefgxgdyxwfwzitejexspmnmvclurutmhcvcrwdkzkp
hatetorwbibmbsjmjklorqrivkzuzgfghyhezyxgxajufkfy
tqnonwdmvsvunidwdsxelalqibufupsxcjcnctknklmpsrsj
wlavahghizifazyhybkvglgzuropoxenwtwvojexetyfmbmr
jcvgvqtydkdodulolmnqtstkxmbwbihijajgbazizclwhmha
vspqpyfoxuxwpkfyfuzgncnskdwhwruzelepevmpmnorutul
yncxcjijkbkhcbajadmxinibwtqrqzgpyvyxqlgzgvahodot
lexixsvafmfqfwnqnopsvuvmzodydkjklclidcbkbenyjojc
xursrahqzwzyrmhahwbipepumfyjytwbgngrgxoropqtwvwn
apezelklmdmjedclcfozkpkdyvstsbiraxazsnibixcjqfqv
ngzkzuxchohshypspqruxwxobqfafmlmnenkfedmdgpalqle
zwtutcjsbybatojcjydkrgrwohalavydipitizqtqrsvyxyp
crgbgnmnofolgfenehqbmrmfaxuvudktczcbupkdkzelshsx
pibmbwzejqjujarurstwzyzqdshchonopgpmhgfofircnsng
byvwveludadcvqlelafmtityqjcncxafkrkvkbsvstuxazar
etidipopqhqnihgpgjsdotohczwxwfmvebedwrmfmbgnujuz
rkdodybglslwlctwtuvybabsfujejqpqrirojihqhktepupi
daxyxgnwfcfexsngnchovkvaslepezchmtmxmduxuvwzcbct
gvkfkrqrsjspkjirilufqvqjebyzyhoxgdgfytohodipwlwb

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: slepez
Cipher: fyrcrm

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: slepez
Cipher: 341351535155

Extended Methods:
Method #1

Plaintext: slepez
method variations:
xqkukecvpzpkhaueupnfzkzu

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
s l e p e z 
3 1 5 5 5 5 
4 3 1 3 1 5 
They are then read out in rows:
315555431315
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: slepez
Cipher: czzolv

Read more ...
Method #3

Plaintext: slepez
method variations:
dxvxvp xvxvpd vxvpdx
xvpdxv vpdxvx pdxvxv

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: slepez

all 720 cipher variations:
slepez slepze sleepz sleezp slezep slezpe slpeez slpeze slpeez slpeze slpzee
slpzee slepez slepze sleepz sleezp slezep slezpe slzpee slzpee slzepe slzeep
slzeep slzepe selpez selpze selepz selezp selzep selzpe seplez seplze sepelz
sepezl sepzel sepzle seeplz seepzl seelpz seelzp seezlp seezpl sezpel sezple
sezepl sezelp sezlep sezlpe spelez spelze speelz speezl spezel spezle spleez
spleze spleez spleze splzee splzee spelez spelze speelz speezl spezel spezle
spzlee spzlee spzele spzeel spzeel spzele seeplz seepzl seelpz seelzp seezlp
seezpl sepelz sepezl seplez seplze sepzle sepzel selpez selpze selepz selezp
selzep selzpe sezple sezpel sezlpe sezlep sezelp sezepl szepel szeple szeepl
szeelp szelep szelpe szpeel szpele szpeel szpele szplee szplee szepel szeple
szeepl szeelp szelep szelpe szlpee szlpee szlepe szleep szleep szlepe lsepez
lsepze lseepz lseezp lsezep lsezpe lspeez lspeze lspeez lspeze lspzee lspzee
lsepez lsepze lseepz lseezp lsezep lsezpe lszpee lszpee lszepe lszeep lszeep
lszepe lespez lespze lesepz lesezp leszep leszpe lepsez lepsze lepesz lepezs
lepzes lepzse leepsz leepzs leespz leeszp leezsp leezps lezpes lezpse lezeps
lezesp lezsep lezspe lpesez lpesze lpeesz lpeezs lpezes lpezse lpseez lpseze
lpseez lpseze lpszee lpszee lpesez lpesze lpeesz lpeezs lpezes lpezse lpzsee
lpzsee lpzese lpzees lpzees lpzese leepsz leepzs leespz leeszp leezsp leezps
lepesz lepezs lepsez lepsze lepzse lepzes lespez lespze lesepz lesezp leszep
leszpe lezpse lezpes lezspe lezsep lezesp lezeps lzepes lzepse lzeeps lzeesp
lzesep lzespe lzpees lzpese lzpees lzpese lzpsee lzpsee lzepes lzepse lzeeps
lzeesp lzesep lzespe lzspee lzspee lzsepe lzseep lzseep lzsepe elspez elspze
elsepz elsezp elszep elszpe elpsez elpsze elpesz elpezs elpzes elpzse elepsz
elepzs elespz eleszp elezsp elezps elzpes elzpse elzeps elzesp elzsep elzspe
eslpez eslpze eslepz eslezp eslzep eslzpe esplez esplze espelz espezl espzel
espzle eseplz esepzl eselpz eselzp esezlp esezpl eszpel eszple eszepl eszelp
eszlep eszlpe epslez epslze epselz epsezl epszel epszle eplsez eplsze eplesz
eplezs eplzes eplzse epelsz epelzs epeslz epeszl epezsl epezls epzles epzlse
epzels epzesl epzsel epzsle eesplz eespzl eeslpz eeslzp eeszlp eeszpl eepslz
eepszl eeplsz eeplzs eepzls eepzsl eelpsz eelpzs eelspz eelszp eelzsp eelzps
eezpls eezpsl eezlps eezlsp eezslp eezspl ezspel ezsple ezsepl ezselp ezslep
ezslpe ezpsel ezpsle ezpesl ezpels ezples ezplse ezepsl ezepls ezespl ezeslp
ezelsp ezelps ezlpes ezlpse ezleps ezlesp ezlsep ezlspe plesez plesze pleesz
pleezs plezes plezse plseez plseze plseez plseze plszee plszee plesez plesze
pleesz pleezs plezes plezse plzsee plzsee plzese plzees plzees plzese pelsez
pelsze pelesz pelezs pelzes pelzse peslez peslze peselz pesezl peszel peszle
peeslz peeszl peelsz peelzs peezls peezsl pezsel pezsle pezesl pezels pezles
pezlse pselez pselze pseelz pseezl psezel psezle psleez psleze psleez psleze
pslzee pslzee pselez pselze pseelz pseezl psezel psezle pszlee pszlee pszele
pszeel pszeel pszele peeslz peeszl peelsz peelzs peezls peezsl peselz pesezl
peslez peslze peszle peszel pelsez pelsze pelesz pelezs pelzes pelzse pezsle
pezsel pezlse pezles pezels pezesl pzesel pzesle pzeesl pzeels pzeles pzelse
pzseel pzsele pzseel pzsele pzslee pzslee pzesel pzesle pzeesl pzeels pzeles
pzelse pzlsee pzlsee pzlese pzlees pzlees pzlese elepsz elepzs elespz eleszp
elezsp elezps elpesz elpezs elpsez elpsze elpzse elpzes elspez elspze elsepz
elsezp elszep elszpe elzpse elzpes elzspe elzsep elzesp elzeps eelpsz eelpzs
eelspz eelszp eelzsp eelzps eeplsz eeplzs eepslz eepszl eepzsl eepzls eesplz
eespzl eeslpz eeslzp eeszlp eeszpl eezpsl eezpls eezspl eezslp eezlsp eezlps
epelsz epelzs epeslz epeszl epezsl epezls eplesz eplezs eplsez eplsze eplzse
eplzes epslez epslze epselz epsezl epszel epszle epzlse epzles epzsle epzsel
epzesl epzels eseplz esepzl eselpz eselzp esezlp esezpl espelz espezl esplez
esplze espzle espzel eslpez eslpze eslepz eslezp eslzep eslzpe eszple eszpel
eszlpe eszlep eszelp eszepl ezepsl ezepls ezespl ezeslp ezelsp ezelps ezpesl
ezpels ezpsel ezpsle ezplse ezples ezspel ezsple ezsepl ezselp ezslep ezslpe
ezlpse ezlpes ezlspe ezlsep ezlesp ezleps zlepes zlepse zleeps zleesp zlesep
zlespe zlpees zlpese zlpees zlpese zlpsee zlpsee zlepes zlepse zleeps zleesp
zlesep zlespe zlspee zlspee zlsepe zlseep zlseep zlsepe zelpes zelpse zeleps
zelesp zelsep zelspe zeples zeplse zepels zepesl zepsel zepsle zeepls zeepsl
zeelps zeelsp zeeslp zeespl zespel zesple zesepl zeselp zeslep zeslpe zpeles
zpelse zpeels zpeesl zpesel zpesle zplees zplese zplees zplese zplsee zplsee
zpeles zpelse zpeels zpeesl zpesel zpesle zpslee zpslee zpsele zpseel zpseel
zpsele zeepls zeepsl zeelps zeelsp zeeslp zeespl zepels zepesl zeples zeplse
zepsle zepsel zelpes zelpse zeleps zelesp zelsep zelspe zesple zespel zeslpe
zeslep zeselp zesepl zsepel zseple zseepl zseelp zselep zselpe zspeel zspele
zspeel zspele zsplee zsplee zsepel zseple zseepl zseelp zselep zselpe zslpee
zslpee zslepe zsleep zsleep zslepe

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

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