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painesville

strafer

chondrosarcoma

tondentisque

marshaled

seafloor

sanguinous

gullett

candlers

debuerintque

quotienteque

revocet

gerontine

egmac

ephyra

stoush

percoidean

nephusim


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: leguen
cipher variations:
mfhvfo ngiwgp ohjxhq pikyir qjlzjs
rkmakt slnblu tmocmv unpdnw voqeox
wprfpy xqsgqz yrthra zsuisb atvjtc
buwkud cvxlve dwymwf exznxg fyaoyh
gzbpzi hacqaj ibdrbk jcescl kdftdm

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: leguen
Cipher: ovtfvm

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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: leguen
Cipher: ABABA AABAA AABBA BAABB AABAA ABBAA

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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: leguen
cipher variations:
mfhvfointjnoevfxvoadrldowldzlostpntokjnpjogrzdro
czlrzoyhxfhoupjtpoqxvhxongiwgpjoukopfwgywpbesmep
xmeamptuqouplkoqkphsaespdamsapziygipvqkuqprywiyp
ohjxhqkpvlpqgxhzxqcftnfqynfbnquvrpvqmlprlqitbftq
ebntbqajzhjqwrlvrqszxjzqpikyirlqwmqrhyiayrdguogr
zogcorvwsqwrnmqsmrjucgurfcoucrbkaikrxsmwsrtaykar
qjlzjsmrxnrsizjbzsehvphsaphdpswxtrxsonrtnskvdhvs
gdpvdsclbjlsytnxtsubzlbsrkmaktnsyostjakcatfiwqit
bqieqtxyusytposuotlweiwtheqwetdmckmtzuoyutvcamct
slnbluotzptukbldbugjxrjucrjfruyzvtzuqptvpumxfjxu
ifrxfuendlnuavpzvuwdbndutmocmvpuaquvlcmecvhkyskv
dskgsvzawuavrquwqvnygkyvjgsygvfoemovbwqawvxecoev
unpdnwqvbrvwmdnfdwilztlwetlhtwabxvbwsrvxrwozhlzw
khtzhwgpfnpwcxrbxwyfdpfwvoqeoxrwcswxneogexjmaumx
fumiuxbcywcxtswysxpaimaxliuaixhqgoqxdyscyxzgeqgx
wprfpysxdtxyofphfyknbvnygvnjvycdzxdyutxztyqbjnby
mjvbjyirhpryeztdzyahfrhyxqsgqztyeuyzpgqigzlocwoz
hwokwzdeayezvuyauzrckocznkwckzjsiqszfaueazbigsiz
yrthrauzfvzaqhrjhampdxpaixplxaefbzfawvzbvasdlpda
olxdlaktjrtagbvfbacjhtjazsuisbvagwabriskibnqeyqb
jyqmybfgcagbxwacwbtemqebpmyembluksubhcwgcbdkiukb
atvjtcwbhxbcsjtljcorfzrckzrnzcghdbhcyxbdxcufnrfc
qnzfncmvltvcidxhdceljvlcbuwkudxciycdtkumkdpsgasd
lasoadhiecidzyceydvgosgdroagodnwmuwdjeyiedfmkwmd
cvxlveydjzdeulvnleqthbtembtpbeijfdjeazdfzewhpthe
spbhpeoxnvxekfzjfegnlxnedwymwfzekaefvmwomfruicuf
ncuqcfjkgekfbaegafxiquiftqciqfpyowyflgakgfhomyof
exznxgaflbfgwnxpngsvjdvgodvrdgklhflgcbfhbgyjrvjg
urdjrgqzpxzgmhblhgipnzpgfyaoyhbgmcghxoyqohtwkewh
pewsehlmigmhdcgichzkswkhvsekshraqyahnicmihjqoaqh
gzbpzichndhiypzrpiuxlfxiqfxtfimnjhniedhjdialtxli
wtfltisbrzbiojdnjikrpbrihacqajdioeijzqasqjvymgyj
rgyugjnokiojfeikejbmuymjxugmujtcsacjpkeokjlsqcsj
ibdrbkejpfjkarbtrkwznhzkshzvhkopljpkgfjlfkcnvznk
yvhnvkudtbdkqlfplkmtrdtkjcesclfkqgklbscuslxaoial
tiawilpqmkqlhgkmgldowaolzwiowlveucelrmgqmlnuseul
kdftdmglrhlmctdvtmybpjbmujbxjmqrnlrmihlnhmepxbpm
axjpxmwfvdfmsnhrnmovtfvmleguenhmsimnduewunzcqkcn
vkcyknrsomsnjimoinfqycqnbykqynxgwegntoisonpwugwn

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: leguen
Cipher: yrthra

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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: leguen
Cipher: 135122545133

Extended Methods:
Method #1

Plaintext: leguen
method variations:
qkmzksvprepxauwkucfzbpzh

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
l e g u e n 
1 5 2 5 5 3 
3 1 2 4 1 3 
They are then read out in rows:
152553312413
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: leguen
Cipher: vwpcrl

Read more ...
Method #3

Plaintext: leguen
method variations:
xfwylc fwylcx wylcxf
ylcxfw lcxfwy cxfwyl

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: leguen

all 720 cipher variations:
leguen legune legeun legenu legneu legnue leugen leugne leuegn leueng leuneg
leunge leeugn leeung leegun leegnu leengu leenug lenueg lenuge leneug lenegu
lengeu lengue lgeuen lgeune lgeeun lgeenu lgeneu lgenue lgueen lguene lgueen
lguene lgunee lgunee lgeuen lgeune lgeeun lgeenu lgeneu lgenue lgnuee lgnuee
lgneue lgneeu lgneeu lgneue lugeen lugene lugeen lugene lugnee lugnee luegen
luegne lueegn lueeng lueneg luenge lueegn lueeng luegen luegne luenge lueneg
luneeg lunege luneeg lunege lungee lungee leguen legune legeun legenu legneu
legnue leugen leugne leuegn leueng leuneg leunge leeugn leeung leegun leegnu
leengu leenug lenueg lenuge leneug lenegu lengeu lengue lnguee lnguee lngeue
lngeeu lngeeu lngeue lnugee lnugee lnuege lnueeg lnueeg lnuege lneuge lneueg
lnegue lnegeu lneegu lneeug lneueg lneuge lneeug lneegu lnegeu lnegue elguen
elgune elgeun elgenu elgneu elgnue elugen elugne eluegn elueng eluneg elunge
eleugn eleung elegun elegnu elengu elenug elnueg elnuge elneug elnegu elngeu
elngue egluen eglune egleun eglenu eglneu eglnue egulen egulne egueln eguenl
egunel egunle egeuln egeunl egelun egelnu egenlu egenul egnuel egnule egneul
egnelu egnleu egnlue euglen euglne eugeln eugenl eugnel eugnle eulgen eulgne
eulegn euleng eulneg eulnge euelgn euelng euegln euegnl euengl euenlg eunleg
eunlge eunelg eunegl eungel eungle eeguln eegunl eeglun eeglnu eegnlu eegnul
eeugln eeugnl eeulgn eeulng eeunlg eeungl eelugn eelung eelgun eelgnu eelngu
eelnug eenulg eenugl eenlug eenlgu eenglu eengul enguel engule engeul engelu
engleu englue enugel enugle enuegl enuelg enuleg enulge eneugl eneulg enegul
eneglu enelgu enelug enlueg enluge enleug enlegu enlgeu enlgue geluen gelune
geleun gelenu gelneu gelnue geulen geulne geueln geuenl geunel geunle geeuln
geeunl geelun geelnu geenlu geenul genuel genule geneul genelu genleu genlue
gleuen gleune gleeun gleenu gleneu glenue glueen gluene glueen gluene glunee
glunee gleuen gleune gleeun gleenu gleneu glenue glnuee glnuee glneue glneeu
glneeu glneue guleen gulene guleen gulene gulnee gulnee guelen guelne gueeln
gueenl guenel guenle gueeln gueenl guelen guelne guenle guenel guneel gunele
guneel gunele gunlee gunlee geluen gelune geleun gelenu gelneu gelnue geulen
geulne geueln geuenl geunel geunle geeuln geeunl geelun geelnu geenlu geenul
genuel genule geneul genelu genleu genlue gnluee gnluee gnleue gnleeu gnleeu
gnleue gnulee gnulee gnuele gnueel gnueel gnuele gneule gneuel gnelue gneleu
gneelu gneeul gneuel gneule gneeul gneelu gneleu gnelue ueglen ueglne uegeln
uegenl uegnel uegnle uelgen uelgne uelegn ueleng uelneg uelnge ueelgn ueelng
ueegln ueegnl ueengl ueenlg uenleg uenlge uenelg uenegl uengel uengle ugelen
ugelne ugeeln ugeenl ugenel ugenle ugleen uglene ugleen uglene uglnee uglnee
ugelen ugelne ugeeln ugeenl ugenel ugenle ugnlee ugnlee ugnele ugneel ugneel
ugnele ulgeen ulgene ulgeen ulgene ulgnee ulgnee ulegen ulegne uleegn uleeng
uleneg ulenge uleegn uleeng ulegen ulegne ulenge uleneg ulneeg ulnege ulneeg
ulnege ulngee ulngee ueglen ueglne uegeln uegenl uegnel uegnle uelgen uelgne
uelegn ueleng uelneg uelnge ueelgn ueelng ueegln ueegnl ueengl ueenlg uenleg
uenlge uenelg uenegl uengel uengle unglee unglee ungele ungeel ungeel ungele
unlgee unlgee unlege unleeg unleeg unlege unelge uneleg unegle unegel uneegl
uneelg uneleg unelge uneelg uneegl unegel unegle eeguln eegunl eeglun eeglnu
eegnlu eegnul eeugln eeugnl eeulgn eeulng eeunlg eeungl eelugn eelung eelgun
eelgnu eelngu eelnug eenulg eenugl eenlug eenlgu eenglu eengul egeuln egeunl
egelun egelnu egenlu egenul egueln eguenl egulen egulne egunle egunel egluen
eglune egleun eglenu eglneu eglnue egnule egnuel egnlue egnleu egnelu egneul
eugeln eugenl euglen euglne eugnle eugnel euegln euegnl euelgn euelng euenlg
euengl eulegn euleng eulgen eulgne eulnge eulneg eunelg eunegl eunleg eunlge
eungle eungel elguen elgune elgeun elgenu elgneu elgnue elugen elugne eluegn
elueng eluneg elunge eleugn eleung elegun elegnu elengu elenug elnueg elnuge
elneug elnegu elngeu elngue engule enguel englue engleu engelu engeul enugle
enugel enulge enuleg enuelg enuegl enluge enlueg enlgue enlgeu enlegu enleug
eneulg eneugl enelug enelgu eneglu enegul neguel negule negeul negelu negleu
neglue neugel neugle neuegl neuelg neuleg neulge neeugl neeulg neegul neeglu
neelgu neelug nelueg neluge neleug nelegu nelgeu nelgue ngeuel ngeule ngeeul
ngeelu ngeleu ngelue ngueel nguele ngueel nguele ngulee ngulee ngeuel ngeule
ngeeul ngeelu ngeleu ngelue ngluee ngluee ngleue ngleeu ngleeu ngleue nugeel
nugele nugeel nugele nuglee nuglee nuegel nuegle nueegl nueelg nueleg nuelge
nueegl nueelg nuegel nuegle nuelge nueleg nuleeg nulege nuleeg nulege nulgee
nulgee neguel negule negeul negelu negleu neglue neugel neugle neuegl neuelg
neuleg neulge neeugl neeulg neegul neeglu neelgu neelug nelueg neluge neleug
nelegu nelgeu nelgue nlguee nlguee nlgeue nlgeeu nlgeeu nlgeue nlugee nlugee
nluege nlueeg nlueeg nluege nleuge nleueg nlegue nlegeu nleegu nleeug nleueg
nleuge nleeug nleegu nlegeu nlegue

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

History of cryptography
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