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unconcealableness

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glideless

sabinumque

gedia

kaunzinger


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: gereur
cipher variations:
hfsfvs igtgwt jhuhxu kiviyv ljwjzw
mkxkax nlylby omzmcz pnanda qoboeb
rpcpfc sqdqgd trerhe usfsif vtgtjg
wuhukh xvivli ywjwmj zxkxnk aylyol
bzmzpm canaqn dbobro ecpcsp fdqdtq

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: gereur
Cipher: tvivfi

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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: gereur
Cipher: AABBA AABAA BAAAA AABAA BAABB BAAAA

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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: gereur
cipher variations:
hfsfvstnanjafvivxirdqdlqdlylzyptgtngnjwjpwzrerde
lzmzrmxhuhfujpcptcvxkxhkigtgwtuobokbgwjwyjseremr
emzmazquhuohokxkqxasfsefmanasnyivigvkqdqudwylyil
jhuhxuvpcplchxkxzktfsfnsfnanbarvivpiplylrybtgtfg
nbobtozjwjhwlrervexzmzjmkiviyvwqdqmdiylyalugtgot
gobocbswjwqjqmzmszcuhughocpcupakxkixmsfswfyanakn
ljwjzwxrernejzmzbmvhuhpuhpcpdctxkxrkrnantadvivhi
pdqdvqblyljyntgtxgzboblomkxkaxysfsofkanacnwiviqv
iqdqeduylyslsoboubewjwijqerewrcmzmkzouhuyhacpcmp
nlylbyztgtpglbobdoxjwjrwjrerfevzmztmtpcpvcfxkxjk
rfsfxsdnanlapvivzibdqdnqomzmczauhuqhmcpcepykxksx
ksfsgfwanaunuqdqwdgylyklsgtgyteobombqwjwajcereor
pnandabvivrindqdfqzlyltyltgthgxbobvovrerxehzmzlm
thuhzufpcpncrxkxbkdfsfpsqoboebcwjwsjoeregramzmuz
muhuihycpcwpwsfsyfianamnuiviavgqdqodsylyclegtgqt
rpcpfcdxkxtkpfsfhsbnanvanvivjizdqdxqxtgtzgjbobno
vjwjbwhrerpetzmzdmfhuhrusqdqgdeylyulqgtgitcobowb
owjwkjaereyryuhuahkcpcopwkxkcxisfsqfuanaengivisv
trerhefzmzvmrhuhjudpcpxcpxkxlkbfsfzszvivbildqdpq
xlyldyjtgtrgvbobfohjwjtwusfsifganawnsivikveqdqyd
qylymlcgtgatawjwcjmereqrymzmezkuhushwcpcgpikxkux
vtgtjghbobxotjwjlwfrerzerzmznmdhuhbubxkxdknfsfrs
znanfalvivtixdqdhqjlylvywuhukhicpcypukxkmxgsfsaf
sanaoneivicvcylyelogtgstaobogbmwjwujyereirkmzmwz
xvivlijdqdzqvlylnyhtgtbgtbobpofjwjdwdzmzfmphuhtu
bpcphcnxkxvkzfsfjslnanxaywjwmjkerearwmzmoziuhuch
ucpcqpgkxkexeanagnqiviuvcqdqidoylywlagtgktmoboyb
zxkxnklfsfbsxnanpajvivdivdqdrqhlylfyfbobhorjwjvw
drerjepzmzxmbhuhlunpcpzcaylyolmgtgctyoboqbkwjwej
weresrimzmgzgcpcipskxkwxesfskfqanayncivimvoqdqad
bzmzpmnhuhduzpcprclxkxfkxfsftsjnanhahdqdjqtlylxy
ftgtlgrbobzodjwjnwprerbecanaqnoivievaqdqsdmylygl
ygtgutkoboibierekrumzmyzguhumhscpcapekxkoxqsfscf
dbobropjwjfwbrertenzmzhmzhuhvulpcpjcjfsflsvnanza
hvivnitdqdbqflylpyrtgtdgecpcspqkxkgxcsfsufoanain
aiviwvmqdqkdkgtgmtwoboabiwjwojuerecrgmzmqzsuhueh
fdqdtqrlylhydtgtvgpbobjobjwjxwnrerlelhuhnuxpcpbc
jxkxpkvfsfdshnanratvivfigereursmzmizeuhuwhqcpckp
ckxkyxosfsmfmiviovyqdqcdkylyqlwgtgetiobosbuwjwgj

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: gereur
Cipher: trerhe

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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: gereur
Cipher: 225124515424

Extended Methods:
Method #1

Plaintext: gereur
method variations:
mkwkzwrpbpebwugukgbzmzpm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
g e r e u r 
2 5 2 5 5 2 
2 1 4 1 4 4 
They are then read out in rows:
252552214144
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: gereur
Cipher: wwkbdt

Read more ...
Method #3

Plaintext: gereur
method variations:
wfyvii fyviiw yviiwf
viiwfy iiwfyv iwfyvi

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: gereur

all 720 cipher variations:
gereur gereru geruer gerure gerrue gerreu geerur geerru geeurr geeurr geerur
geerru geuerr geuerr geurer geurre geurre geurer gereur gereru geruer gerure
gerrue gerreu greeur greeru greuer greure grerue grereu greeur greeru greuer
greure grerue grereu grueer gruere grueer gruere gruree gruree grreue grreeu
grruee grruee grreue grreeu gereur gereru geruer gerure gerrue gerreu geerur
geerru geeurr geeurr geerur geerru geuerr geuerr geurer geurre geurre geurer
gereur gereru geruer gerure gerrue gerreu gureer gurere gureer gurere gurree
gurree guerer guerre gueerr gueerr guerer guerre gueerr gueerr guerer guerre
guerre guerer gureer gurere gureer gurere gurree gurree grreue grreeu grruee
grruee grreue grreeu grerue grereu greure greuer greeur greeru gruere grueer
gruree gruree gruere grueer greeur greeru greuer greure grerue grereu egreur
egreru egruer egrure egrrue egrreu egerur egerru egeurr egeurr egerur egerru
eguerr eguerr egurer egurre egurre egurer egreur egreru egruer egrure egrrue
egrreu ergeur ergeru erguer ergure ergrue ergreu eregur eregru ereugr ereurg
ererug erergu eruegr eruerg eruger erugre erurge erureg erreug erregu errueg
erruge errgue errgeu eergur eergru eerugr eerurg eerrug eerrgu eegrur eegrru
eegurr eegurr eegrur eegrru eeugrr eeugrr eeurgr eeurrg eeurrg eeurgr eergur
eergru eerugr eerurg eerrug eerrgu euregr eurerg eurger eurgre eurrge eurreg
euergr euerrg euegrr euegrr euergr euerrg eugerr eugerr eugrer eugrre eugrre
eugrer euregr eurerg eurger eurgre eurrge eurreg erreug erregu errueg erruge
errgue errgeu ererug erergu ereurg ereugr eregur eregru eruerg eruegr erureg
erurge erugre eruger ergeur ergeru erguer ergure ergrue ergreu regeur regeru
reguer regure regrue regreu reegur reegru reeugr reeurg reerug reergu reuegr
reuerg reuger reugre reurge reureg rereug reregu rerueg reruge rergue rergeu
rgeeur rgeeru rgeuer rgeure rgerue rgereu rgeeur rgeeru rgeuer rgeure rgerue
rgereu rgueer rguere rgueer rguere rguree rguree rgreue rgreeu rgruee rgruee
rgreue rgreeu regeur regeru reguer regure regrue regreu reegur reegru reeugr
reeurg reerug reergu reuegr reuerg reuger reugre reurge reureg rereug reregu
rerueg reruge rergue rergeu rugeer rugere rugeer rugere rugree rugree rueger
ruegre rueegr rueerg ruereg ruerge rueegr rueerg rueger ruegre ruerge ruereg
rureeg rurege rureeg rurege rurgee rurgee rrgeue rrgeeu rrguee rrguee rrgeue
rrgeeu rregue rregeu rreuge rreueg rreeug rreegu rruege rrueeg rrugee rrugee
rruege rrueeg rreeug rreegu rreueg rreuge rregue rregeu eergur eergru eerugr
eerurg eerrug eerrgu eegrur eegrru eegurr eegurr eegrur eegrru eeugrr eeugrr
eeurgr eeurrg eeurrg eeurgr eergur eergru eerugr eerurg eerrug eerrgu eregur
eregru ereugr ereurg ererug erergu ergeur ergeru erguer ergure ergrue ergreu
eruger erugre eruegr eruerg erureg erurge errgue errgeu erruge errueg erreug
erregu egreur egreru egruer egrure egrrue egrreu egerur egerru egeurr egeurr
egerur egerru eguerr eguerr egurer egurre egurre egurer egreur egreru egruer
egrure egrrue egrreu eurger eurgre euregr eurerg eurreg eurrge eugrer eugrre
eugerr eugerr eugrer eugrre euegrr euegrr euergr euerrg euerrg euergr eurger
eurgre euregr eurerg eurreg eurrge errgue errgeu erruge errueg erreug erregu
ergrue ergreu ergure erguer ergeur ergeru erugre eruger erurge erureg eruerg
eruegr eregur eregru ereugr ereurg ererug erergu ueregr uererg uerger uergre
uerrge uerreg ueergr ueerrg ueegrr ueegrr ueergr ueerrg uegerr uegerr uegrer
uegrre uegrre uegrer ueregr uererg uerger uergre uerrge uerreg ureegr ureerg
ureger uregre urerge urereg ureegr ureerg ureger uregre urerge urereg urgeer
urgere urgeer urgere urgree urgree urrege urreeg urrgee urrgee urrege urreeg
ueregr uererg uerger uergre uerrge uerreg ueergr ueerrg ueegrr ueegrr ueergr
ueerrg uegerr uegerr uegrer uegrre uegrre uegrer ueregr uererg uerger uergre
uerrge uerreg ugreer ugrere ugreer ugrere ugrree ugrree ugerer ugerre ugeerr
ugeerr ugerer ugerre ugeerr ugeerr ugerer ugerre ugerre ugerer ugreer ugrere
ugreer ugrere ugrree ugrree urrege urreeg urrgee urrgee urrege urreeg urerge
urereg uregre ureger ureegr ureerg urgere urgeer urgree urgree urgere urgeer
ureegr ureerg ureger uregre urerge urereg rereug reregu rerueg reruge rergue
rergeu reerug reergu reeurg reeugr reegur reegru reuerg reuegr reureg reurge
reugre reuger regeur regeru reguer regure regrue regreu rreeug rreegu rreueg
rreuge rregue rregeu rreeug rreegu rreueg rreuge rregue rregeu rrueeg rruege
rrueeg rruege rrugee rrugee rrgeue rrgeeu rrguee rrguee rrgeue rrgeeu rereug
reregu rerueg reruge rergue rergeu reerug reergu reeurg reeugr reegur reegru
reuerg reuegr reureg reurge reugre reuger regeur regeru reguer regure regrue
regreu rureeg rurege rureeg rurege rurgee rurgee ruereg ruerge rueerg rueegr
rueger ruegre rueerg rueegr ruereg ruerge ruegre rueger rugeer rugere rugeer
rugere rugree rugree rgreue rgreeu rgruee rgruee rgreue rgreeu rgerue rgereu
rgeure rgeuer rgeeur rgeeru rguere rgueer rguree rguree rguere rgueer rgeeur
rgeeru rgeuer rgeure rgerue rgereu

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