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zanghi

nemetesque

wailer

wolffian

parture

implorabitis

teedee

alanine

malapert

whiteboyism

sulphoricinoleate

nothdurft

vetustoque

nondisfigurement

bullimong

uoceque

gauzy

savagerous


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: premet
cipher variations:
qsfnfu rtgogv suhphw tviqix uwjrjy
vxkskz wyltla xzmumb yanvnc zbowod
acpxpe bdqyqf cerzrg dfsash egtbti
fhucuj givdvk hjwewl ikxfxm jlygyn
kmzhzo lnaiap mobjbq npckcr oqdlds

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: premet
Cipher: kivnvg

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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: premet
Cipher: ABBBA BAAAA AABAA ABABB AABAA BAABA

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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: premet
cipher variations:
qsfnfuuanlngyivjvscqdhdegylflqkgtdtcswjzjawerxrm
amzvzyeuhthkicprpwmkxpxirtgogvvbomohzjwkwtdreief
hzmgmrlhueudtxkakbxfsysnbnawazfviuiljdqsqxnlyqyj
suhphwwcpnpiakxlxuesfjfgianhnsmivfveuylblcygtzto
cobxbagwjvjmkertryomzrzktviqixxdqoqjblymyvftgkgh
jboiotnjwgwfvzmcmdzhuaupdpcycbhxkwknlfsuszpnasal
uwjrjyyerprkcmznzwguhlhikcpjpuokxhxgwandneaivbvq
eqdzdciylxlomgtvtaqobtbmvxkskzzfsqsldnaoaxhvimij
ldqkqvplyiyhxboeofbjwcwrfreaedjzmympnhuwubrpcucn
wyltlaagtrtmeobpbyiwjnjkmerlrwqmzjziycpfpgckxdxs
gsfbfekanznqoivxvcsqdvdoxzmumbbhusunfpcqczjxkokl
nfsmsxrnakajzdqgqhdlyeythtgcgflboaorpjwywdtrewep
yanvnccivtvogqdrdakylplmogtntysoblbkaerhriemzfzu
iuhdhgmcpbpsqkxzxeusfxfqzbowoddjwuwphreseblzmqmn
phuouztpcmclbfsisjfnagavjvieihndqcqtrlyayfvtgygr
acpxpeekxvxqisftfcmanrnoqivpvauqdndmcgtjtkgobhbw
kwjfjioerdrusmzbzgwuhzhsbdqyqfflywyrjtgugdnbosop
rjwqwbvreoendhukulhpcicxlxkgkjpfsesvtnacahxviait
cerzrggmzxzskuhvheocptpqskxrxcwsfpfoeivlvmiqdjdy
mylhlkqgtftwuobdbiywjbjudfsashhnayatlviwifpdquqr
tlysydxtgqgpfjwmwnjrekeznzmimlrhuguxvpcecjzxkckv
egtbtiiobzbumwjxjgqervrsumztzeyuhrhqgkxnxoksflfa
oanjnmsivhvywqdfdkayldlwfhucujjpcacvnxkykhrfswst
vnauafzvisirhlyoypltgmgbpbokontjwiwzxregelbzmemx
givdvkkqdbdwoylzlisgtxtuwobvbgawjtjsimzpzqmuhnhc
qcplpoukxjxaysfhfmcanfnyhjwewllrecexpzmamjthuyuv
xpcwchbxkuktjnaqarnvioidrdqmqpvlykybztgigndbogoz
ikxfxmmsfdfyqanbnkuivzvwyqdxdicylvlukobrbsowjpje
sernrqwmzlzcauhjhoecphpajlygynntgegzrbocolvjwawx
zreyejdzmwmvlpcsctpxkqkftfsosrxnamadbvikipfdqiqb
kmzhzoouhfhascpdpmwkxbxyasfzfkeanxnwmqdtduqylrlg
ugtptsyobnbecwjljqgerjrclnaiappvigibtdqeqnxlycyz
btgaglfboyoxnreuevrzmsmhvhuqutzpcocfdxkmkrhfsksd
mobjbqqwjhjcuerfroymzdzacuhbhmgcpzpyosfvfwsantni
wivrvuaqdpdgeylnlsigtltenpckcrrxkikdvfsgspznaeab
dvicinhdqaqzptgwgxtbouojxjwswvbreqehfzmomtjhumuf
oqdldssyljlewgthtqaobfbcewjdjoierbraquhxhyucpvpk
ykxtxwcsfrfiganpnukivnvgpremettzmkmfxhuiurbpcgcd
fxkekpjfscsbrviyizvdqwqlzlyuyxdtgsgjhboqovljwowh

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: premet
Cipher: cerzrg

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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: premet
Cipher: 532451235144

Extended Methods:
Method #1

Plaintext: premet
method variations:
uwkrkyzbpwpdegubuikmzgzo

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
p r e m e t 
5 2 5 2 5 4 
3 4 1 3 1 4 
They are then read out in rows:
525254341314
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: premet
Cipher: kkuslq

Read more ...
Method #3

Plaintext: premet
method variations:
hyfxqy yfxqyh fxqyhy
xqyhyf qyhyfx yhyfxq

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: premet

all 720 cipher variations:
premet premte preemt preetm pretem pretme prmeet prmete prmeet prmete prmtee
prmtee premet premte preemt preetm pretem pretme prtmee prtmee prteme prteem
prteem prteme permet permte peremt peretm pertem pertme pemret pemrte pemert
pemetr pemter pemtre peemrt peemtr peermt peertm peetrm peetmr petmer petmre
petemr peterm petrem petrme pmeret pmerte pmeert pmeetr pmeter pmetre pmreet
pmrete pmreet pmrete pmrtee pmrtee pmeret pmerte pmeert pmeetr pmeter pmetre
pmtree pmtree pmtere pmteer pmteer pmtere peemrt peemtr peermt peertm peetrm
peetmr pemert pemetr pemret pemrte pemtre pemter permet permte peremt peretm
pertem pertme petmre petmer petrme petrem peterm petemr ptemer ptemre pteemr
pteerm pterem pterme ptmeer ptmere ptmeer ptmere ptmree ptmree ptemer ptemre
pteemr pteerm pterem pterme ptrmee ptrmee ptreme ptreem ptreem ptreme rpemet
rpemte rpeemt rpeetm rpetem rpetme rpmeet rpmete rpmeet rpmete rpmtee rpmtee
rpemet rpemte rpeemt rpeetm rpetem rpetme rptmee rptmee rpteme rpteem rpteem
rpteme repmet repmte repemt repetm reptem reptme rempet rempte remept remetp
remtep remtpe reempt reemtp reepmt reeptm reetpm reetmp retmep retmpe retemp
retepm retpem retpme rmepet rmepte rmeept rmeetp rmetep rmetpe rmpeet rmpete
rmpeet rmpete rmptee rmptee rmepet rmepte rmeept rmeetp rmetep rmetpe rmtpee
rmtpee rmtepe rmteep rmteep rmtepe reempt reemtp reepmt reeptm reetpm reetmp
remept remetp rempet rempte remtpe remtep repmet repmte repemt repetm reptem
reptme retmpe retmep retpme retpem retepm retemp rtemep rtempe rteemp rteepm
rtepem rtepme rtmeep rtmepe rtmeep rtmepe rtmpee rtmpee rtemep rtempe rteemp
rteepm rtepem rtepme rtpmee rtpmee rtpeme rtpeem rtpeem rtpeme erpmet erpmte
erpemt erpetm erptem erptme ermpet ermpte ermept ermetp ermtep ermtpe erempt
eremtp erepmt ereptm eretpm eretmp ertmep ertmpe ertemp ertepm ertpem ertpme
eprmet eprmte epremt epretm eprtem eprtme epmret epmrte epmert epmetr epmter
epmtre epemrt epemtr epermt epertm epetrm epetmr eptmer eptmre eptemr epterm
eptrem eptrme empret emprte empert empetr empter emptre emrpet emrpte emrept
emretp emrtep emrtpe emerpt emertp emeprt emeptr emetpr emetrp emtrep emtrpe
emterp emtepr emtper emtpre eepmrt eepmtr eeprmt eeprtm eeptrm eeptmr eemprt
eemptr eemrpt eemrtp eemtrp eemtpr eermpt eermtp eerpmt eerptm eertpm eertmp
eetmrp eetmpr eetrmp eetrpm eetprm eetpmr etpmer etpmre etpemr etperm etprem
etprme etmper etmpre etmepr etmerp etmrep etmrpe etempr etemrp etepmr eteprm
eterpm etermp etrmep etrmpe etremp etrepm etrpem etrpme mrepet mrepte mreept
mreetp mretep mretpe mrpeet mrpete mrpeet mrpete mrptee mrptee mrepet mrepte
mreept mreetp mretep mretpe mrtpee mrtpee mrtepe mrteep mrteep mrtepe merpet
merpte merept meretp mertep mertpe mepret meprte mepert mepetr mepter meptre
meeprt meeptr meerpt meertp meetrp meetpr metper metpre metepr meterp metrep
metrpe mperet mperte mpeert mpeetr mpeter mpetre mpreet mprete mpreet mprete
mprtee mprtee mperet mperte mpeert mpeetr mpeter mpetre mptree mptree mptere
mpteer mpteer mptere meeprt meeptr meerpt meertp meetrp meetpr mepert mepetr
mepret meprte meptre mepter merpet merpte merept meretp mertep mertpe metpre
metper metrpe metrep meterp metepr mteper mtepre mteepr mteerp mterep mterpe
mtpeer mtpere mtpeer mtpere mtpree mtpree mteper mtepre mteepr mteerp mterep
mterpe mtrpee mtrpee mtrepe mtreep mtreep mtrepe erempt eremtp erepmt ereptm
eretpm eretmp ermept ermetp ermpet ermpte ermtpe ermtep erpmet erpmte erpemt
erpetm erptem erptme ertmpe ertmep ertpme ertpem ertepm ertemp eermpt eermtp
eerpmt eerptm eertpm eertmp eemrpt eemrtp eemprt eemptr eemtpr eemtrp eepmrt
eepmtr eeprmt eeprtm eeptrm eeptmr eetmpr eetmrp eetpmr eetprm eetrpm eetrmp
emerpt emertp emeprt emeptr emetpr emetrp emrept emretp emrpet emrpte emrtpe
emrtep empret emprte empert empetr empter emptre emtrpe emtrep emtpre emtper
emtepr emterp epemrt epemtr epermt epertm epetrm epetmr epmert epmetr epmret
epmrte epmtre epmter eprmet eprmte epremt epretm eprtem eprtme eptmre eptmer
eptrme eptrem epterm eptemr etempr etemrp etepmr eteprm eterpm etermp etmepr
etmerp etmper etmpre etmrpe etmrep etpmer etpmre etpemr etperm etprem etprme
etrmpe etrmep etrpme etrpem etrepm etremp tremep trempe treemp treepm trepem
trepme trmeep trmepe trmeep trmepe trmpee trmpee tremep trempe treemp treepm
trepem trepme trpmee trpmee trpeme trpeem trpeem trpeme termep termpe teremp
terepm terpem terpme temrep temrpe temerp temepr temper tempre teemrp teempr
teermp teerpm teeprm teepmr tepmer tepmre tepemr teperm teprem teprme tmerep
tmerpe tmeerp tmeepr tmeper tmepre tmreep tmrepe tmreep tmrepe tmrpee tmrpee
tmerep tmerpe tmeerp tmeepr tmeper tmepre tmpree tmpree tmpere tmpeer tmpeer
tmpere teemrp teempr teermp teerpm teeprm teepmr temerp temepr temrep temrpe
tempre temper termep termpe teremp terepm terpem terpme tepmre tepmer teprme
teprem teperm tepemr tpemer tpemre tpeemr tpeerm tperem tperme tpmeer tpmere
tpmeer tpmere tpmree tpmree tpemer tpemre tpeemr tpeerm tperem tperme tprmee
tprmee tpreme tpreem tpreem tpreme

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

History of cryptography
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