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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: pookie
cipher variations:
qppljf rqqmkg srrnlh tssomi uttpnj
vuuqok wvvrpl xwwsqm yxxtrn zyyuso
azzvtp baawuq cbbxvr dccyws eddzxt
feeayu gffbzv hggcaw ihhdbx jiiecy
kjjfdz lkkgea mllhfb nmmigc onnjhd

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: pookie
Cipher: kllprv

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: pookie
Cipher: ABBBA ABBAB ABBAB ABAAB ABAAA AABAA

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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: pookie
cipher variations:
qppljfurrfznyttzpvcvvtfdgxxnvlkzzhltsddvrjwffphr
ahhjxzejjdnhillxdpmnnrtxrqqmkgvssgaozuuaqwdwwuge
hyyowmlaaimuteewskxggqisbiikyafkkeoijmmyeqnoosuy
srrnlhwtthbpavvbrxexxvhfizzpxnmbbjnvuffxtlyhhrjt
cjjlzbgllfpjknnzfropptvztssomixuuicqbwwcsyfyywig
jaaqyoncckowvggyumziiskudkkmachmmgqklooagspqquwa
uttpnjyvvjdrcxxdtzgzzxjhkbbrzpoddlpxwhhzvnajjtlv
ellnbdinnhrlmppbhtqrrvxbvuuqokzwwkesdyyeuahaayki
lccsaqpeemqyxiiawobkkumwfmmocejooismnqqciursswyc
wvvrplaxxlftezzfvbibbzljmddtbrqffnrzyjjbxpcllvnx
gnnpdfkppjtnorrdjvsttxzdxwwsqmbyymgufaagwcjccamk
neeucsrggosazkkcyqdmmwoyhooqeglqqkuopssekwtuuyae
yxxtrnczznhvgbbhxdkddbnloffvdtshhptballdzrennxpz
ipprfhmrrlvpqttflxuvvzbfzyyusodaaoiwhcciyeleecom
pggweutiiqucbmmeasfooyqajqqsginssmwqruugmyvwwacg
azzvtpebbpjxiddjzfmffdpnqhhxfvujjrvdcnnfbtgppzrb
krrthjottnxrsvvhnzwxxbdhbaawuqfccqkyjeekagnggeqo
riiygwvkkswedoogcuhqqasclssuikpuuoystwwioaxyycei
cbbxvrgddrlzkfflbhohhfrpsjjzhxwlltxfepphdvirrbtd
mttvjlqvvpztuxxjpbyzzdfjdccywsheesmalggmcipiigsq
tkkaiyxmmuygfqqiewjsscuenuuwkmrwwqauvyykqczaaegk
eddzxtifftnbmhhndjqjjhtrullbjzynnvzhgrrjfxkttdvf
ovvxlnsxxrbvwzzlrdabbfhlfeeayujgguocniioekrkkius
vmmckazoowaihsskgyluuewgpwwymotyyscwxaamsebccgim
gffbzvkhhvpdojjpflslljvtwnndlbappxbjittlhzmvvfxh
qxxznpuzztdxybbntfcddhjnhggcawliiwqepkkqgmtmmkwu
xooemcbqqyckjuumianwwgyiryyaoqvaaueyzccougdeeiko
ihhdbxmjjxrfqllrhnunnlxvyppfndcrrzdlkvvnjboxxhzj
szzbprwbbvfzaddpvheffjlpjiiecynkkysgrmmsiovoomyw
zqqgoedssaemlwwokcpyyiaktaacqsxccwgabeeqwifggkmq
kjjfdzollzthsnntjpwppnzxarrhpfettbfnmxxpldqzzjbl
ubbdrtyddxhbcffrxjghhlnrlkkgeapmmauitooukqxqqoay
bssiqgfuucgonyyqmeraakcmvccesuzeeyicdggsykhiimos
mllhfbqnnbvjuppvlryrrpbzcttjrhgvvdhpozzrnfsbbldn
wddftvaffzjdehhtzlijjnptnmmigcroocwkvqqwmszssqca
duuksihwweiqpaasogtccmeoxeeguwbggakefiiuamjkkoqu
onnjhdsppdxlwrrxntattrdbevvltjixxfjrqbbtphuddnfp
yffhvxchhblfgjjvbnkllprvpookietqqeymxssyoubuusec
fwwmukjyygksrccuqiveeogqzggiwydiicmghkkwcolmmqsw

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: pookie
Cipher: cbbxvr

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: pookie
Cipher: 534343524251

Extended Methods:
Method #1

Plaintext: pookie
method variations:
uttpokzyyutpeddzyukiiedz

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
p o o k i e 
5 4 4 5 4 5 
3 3 3 2 2 1 
They are then read out in rows:
544545333221
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: pookie
Cipher: uyynhb

Read more ...
Method #3

Plaintext: pookie
method variations:
ssxrwv sxrwvs xrwvss
rwvssx wvssxr vssxrw

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: pookie

all 720 cipher variations:
pookie pookei pooike pooiek pooeik pooeki pokoie pokoei pokioe pokieo pokeio
pokeoi poikoe poikeo poioke poioek poieok poieko poekio poekoi poeiko poeiok
poeoik poeoki pookie pookei pooike pooiek pooeik pooeki pokoie pokoei pokioe
pokieo pokeio pokeoi poikoe poikeo poioke poioek poieok poieko poekio poekoi
poeiko poeiok poeoik poeoki pkooie pkooei pkoioe pkoieo pkoeio pkoeoi pkooie
pkooei pkoioe pkoieo pkoeio pkoeoi pkiooe pkioeo pkiooe pkioeo pkieoo pkieoo
pkeoio pkeooi pkeioo pkeioo pkeoio pkeooi piokoe piokeo piooke piooek pioeok
pioeko pikooe pikoeo pikooe pikoeo pikeoo pikeoo piokoe piokeo piooke piooek
pioeok pioeko piekoo piekoo pieoko pieook pieook pieoko peokio peokoi peoiko
peoiok peooik peooki pekoio pekooi pekioo pekioo pekoio pekooi peikoo peikoo
peioko peiook peiook peioko peokio peokoi peoiko peoiok peooik peooki opokie
opokei opoike opoiek opoeik opoeki opkoie opkoei opkioe opkieo opkeio opkeoi
opikoe opikeo opioke opioek opieok opieko opekio opekoi opeiko opeiok opeoik
opeoki oopkie oopkei oopike oopiek oopeik oopeki ookpie ookpei ookipe ookiep
ookeip ookepi ooikpe ooikep ooipke ooipek ooiepk ooiekp ooekip ooekpi ooeikp
ooeipk ooepik ooepki okopie okopei okoipe okoiep okoeip okoepi okpoie okpoei
okpioe okpieo okpeio okpeoi okipoe okipeo okiope okioep okieop okiepo okepio
okepoi okeipo okeiop okeoip okeopi oiokpe oiokep oiopke oiopek oioepk oioekp
oikope oikoep oikpoe oikpeo oikepo oikeop oipkoe oipkeo oipoke oipoek oipeok
oipeko oiekpo oiekop oiepko oiepok oieopk oieokp oeokip oeokpi oeoikp oeoipk
oeopik oeopki oekoip oekopi oekiop oekipo oekpio oekpoi oeikop oeikpo oeiokp
oeiopk oeipok oeipko oepkio oepkoi oepiko oepiok oepoik oepoki oopkie oopkei
oopike oopiek oopeik oopeki ookpie ookpei ookipe ookiep ookeip ookepi ooikpe
ooikep ooipke ooipek ooiepk ooiekp ooekip ooekpi ooeikp ooeipk ooepik ooepki
opokie opokei opoike opoiek opoeik opoeki opkoie opkoei opkioe opkieo opkeio
opkeoi opikoe opikeo opioke opioek opieok opieko opekio opekoi opeiko opeiok
opeoik opeoki okpoie okpoei okpioe okpieo okpeio okpeoi okopie okopei okoipe
okoiep okoeip okoepi okiope okioep okipoe okipeo okiepo okieop okeoip okeopi
okeiop okeipo okepio okepoi oipkoe oipkeo oipoke oipoek oipeok oipeko oikpoe
oikpeo oikope oikoep oikeop oikepo oiokpe oiokep oiopke oiopek oioepk oioekp
oiekop oiekpo oieokp oieopk oiepok oiepko oepkio oepkoi oepiko oepiok oepoik
oepoki oekpio oekpoi oekipo oekiop oekoip oekopi oeikpo oeikop oeipko oeipok
oeiopk oeiokp oeokip oeokpi oeoikp oeoipk oeopik oeopki koopie koopei kooipe
kooiep kooeip kooepi kopoie kopoei kopioe kopieo kopeio kopeoi koipoe koipeo
koiope koioep koieop koiepo koepio koepoi koeipo koeiop koeoip koeopi koopie
koopei kooipe kooiep kooeip kooepi kopoie kopoei kopioe kopieo kopeio kopeoi
koipoe koipeo koiope koioep koieop koiepo koepio koepoi koeipo koeiop koeoip
koeopi kpooie kpooei kpoioe kpoieo kpoeio kpoeoi kpooie kpooei kpoioe kpoieo
kpoeio kpoeoi kpiooe kpioeo kpiooe kpioeo kpieoo kpieoo kpeoio kpeooi kpeioo
kpeioo kpeoio kpeooi kiopoe kiopeo kioope kiooep kioeop kioepo kipooe kipoeo
kipooe kipoeo kipeoo kipeoo kiopoe kiopeo kioope kiooep kioeop kioepo kiepoo
kiepoo kieopo kieoop kieoop kieopo keopio keopoi keoipo keoiop keooip keoopi
kepoio kepooi kepioo kepioo kepoio kepooi keipoo keipoo keiopo keioop keioop
keiopo keopio keopoi keoipo keoiop keooip keoopi iookpe iookep ioopke ioopek
iooepk iooekp iokope iokoep iokpoe iokpeo iokepo iokeop iopkoe iopkeo iopoke
iopoek iopeok iopeko ioekpo ioekop ioepko ioepok ioeopk ioeokp iookpe iookep
ioopke ioopek iooepk iooekp iokope iokoep iokpoe iokpeo iokepo iokeop iopkoe
iopkeo iopoke iopoek iopeok iopeko ioekpo ioekop ioepko ioepok ioeopk ioeokp
ikoope ikooep ikopoe ikopeo ikoepo ikoeop ikoope ikooep ikopoe ikopeo ikoepo
ikoeop ikpooe ikpoeo ikpooe ikpoeo ikpeoo ikpeoo ikeopo ikeoop ikepoo ikepoo
ikeopo ikeoop ipokoe ipokeo ipooke ipooek ipoeok ipoeko ipkooe ipkoeo ipkooe
ipkoeo ipkeoo ipkeoo ipokoe ipokeo ipooke ipooek ipoeok ipoeko ipekoo ipekoo
ipeoko ipeook ipeook ipeoko ieokpo ieokop ieopko ieopok ieoopk ieookp iekopo
iekoop iekpoo iekpoo iekopo iekoop iepkoo iepkoo iepoko iepook iepook iepoko
ieokpo ieokop ieopko ieopok ieoopk ieookp eookip eookpi eooikp eooipk eoopik
eoopki eokoip eokopi eokiop eokipo eokpio eokpoi eoikop eoikpo eoiokp eoiopk
eoipok eoipko eopkio eopkoi eopiko eopiok eopoik eopoki eookip eookpi eooikp
eooipk eoopik eoopki eokoip eokopi eokiop eokipo eokpio eokpoi eoikop eoikpo
eoiokp eoiopk eoipok eoipko eopkio eopkoi eopiko eopiok eopoik eopoki ekooip
ekoopi ekoiop ekoipo ekopio ekopoi ekooip ekoopi ekoiop ekoipo ekopio ekopoi
ekioop ekiopo ekioop ekiopo ekipoo ekipoo ekpoio ekpooi ekpioo ekpioo ekpoio
ekpooi eiokop eiokpo eiookp eioopk eiopok eiopko eikoop eikopo eikoop eikopo
eikpoo eikpoo eiokop eiokpo eiookp eioopk eiopok eiopko eipkoo eipkoo eipoko
eipook eipook eipoko epokio epokoi epoiko epoiok epooik epooki epkoio epkooi
epkioo epkioo epkoio epkooi epikoo epikoo epioko epiook epiook epioko epokio
epokoi epoiko epoiok epooik epooki

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

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