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diver


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: skiles
cipher variations:
tljmft umkngu vnlohv wompiw xpnqjx
yqorky zrpslz asqtma btrunb cusvoc
dvtwpd ewuxqe fxvyrf gywzsg hzxath
iaybui jbzcvj kcadwk ldbexl mecfym
nfdgzn ogehao phfibp qigjcq rjhkdr

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: skiles
Cipher: hprovh

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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: skiles
Cipher: BAAAB ABAAB ABAAA ABABA AABAA BAAAB

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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: skiles
cipher variations:
tljmftdfzindnzpevnxtfadxhnvwlhrhlstrlvrkjlvphgrv
fjxczfpdnyhpzxdupzjrtqxjumknguegajoeoaqfwoyugbey
iowxmisimtusmwslkmwqihswgkydagqeoziqayevqaksuryk
vnlohvfhbkpfpbrgxpzvhcfzjpxynjtjnuvtnxtmlnxrjitx
hlzebhrfpajrbzfwrbltvszlwompiwgiclqgqcshyqawidga
kqyzokukovwuoyunmoyskjuyimafcisgqbkscagxscmuwtam
xpnqjxhjdmrhrdtizrbxjehblrzaplvlpwxvpzvonpztlkvz
jnbgdjthrcltdbhytdnvxubnyqorkyikensiseujascykfic
msabqmwmqxywqawpoqaumlwakochekuisdmuecizueowyvco
zrpslzjlfotjtfvkbtdzlgjdntbcrnxnryzxrbxqprbvnmxb
lpdiflvjtenvfdjavfpxzwdpasqtmakmgpukugwlcueamhke
oucdsoyoszayscyrqscwonycmqejgmwkufowgekbwgqyaxeq
btrunblnhqvlvhxmdvfbnilfpvdetpzptabztdzsrtdxpozd
nrfkhnxlvgpxhflcxhrzbyfrcusvocmoirwmwiynewgcojmg
qwefuqaqubcaueatsueyqpaeosglioymwhqyigmdyisaczgs
dvtwpdnpjsxnxjzofxhdpknhrxfgvrbrvcdbvfbutvfzrqbf
pthmjpznxirzjhnezjtbdahtewuxqeoqktyoykapgyieqloi
syghwscswdecwgcvuwgasrcgquinkqaoyjsakiofakucebiu
fxvyrfprluzpzlbqhzjfrmpjtzhixtdtxefdxhdwvxhbtsdh
rvjolrbpzktbljpgblvdfcjvgywzsgqsmvaqamcriakgsnqk
uaijyueuyfgeyiexwyicuteiswkpmscqalucmkqhcmwegdkw
hzxathrtnwbrbndsjblhtorlvbjkzvfvzghfzjfyxzjdvufj
txlqntdrbmvdnlridnxfhelxiaybuisuoxcscoetkcmiupsm
wcklawgwahigakgzyakewvgkuymrouescnweomsjeoygifmy
jbzcvjtvpydtdpfuldnjvqtnxdlmbxhxbijhblhazblfxwhl
vznspvftdoxfpntkfpzhjgnzkcadwkuwqzeueqgvmeokwruo
yemncyiycjkicmibacmgyximwaotqwguepygqoulgqaikhoa
ldbexlvxrafvfrhwnfplxsvpzfnodzjzdkljdnjcbdnhzyjn
xbpurxhvfqzhrpvmhrbjlipbmecfymwysbgwgsixogqmytwq
agopeakaelmkeokdceoiazkoycqvsyiwgraisqwnisckmjqc
nfdgznxztchxhtjyphrnzuxrbhpqfblbfmnlfpledfpjbalp
zdrwtzjxhsbjtrxojtdlnkrdogehaoyaudiyiukzqisoavys
ciqrgcmcgnomgqmfegqkcbmqaesxuakyitckusypkuemolse
phfibpzbvejzjvlarjtpbwztdjrshdndhopnhrngfhrldcnr
bftyvblzjudlvtzqlvfnpmtfqigjcqacwfkakwmbskuqcxau
ekstieoeipqoisohgismedoscguzwcmakvemwuarmwgoqnug
rjhkdrbdxglblxnctlvrdybvfltujfpfjqrpjtpihjtnfept
dhvaxdnblwfnxvbsnxhprovhskilesceyhmcmyodumwsezcw
gmuvkgqgkrsqkuqjikuogfqueiwbyeocmxgoywctoyiqspwi

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: skiles
Cipher: fxvyrf

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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: skiles
Cipher: 345242135134

Extended Methods:
Method #1

Plaintext: skiles
method variations:
xpoqkxcutvpchzyauhnedfzn

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
s k i l e s 
3 5 4 1 5 3 
4 2 2 3 1 4 
They are then read out in rows:
354153422314
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: skiles
Cipher: xdpimq

Read more ...
Method #3

Plaintext: skiles
method variations:
yrbxlo rbxloy bxloyr
xloyrb loyrbx oyrbxl

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: skiles

all 720 cipher variations:
skiles skilse skiels skiesl skisel skisle sklies sklise skleis sklesi sklsei
sklsie skelis skelsi skeils skeisl skesil skesli skslei skslie skseli skseil
sksiel sksile sikles siklse sikels sikesl siksel siksle silkes silkse sileks
silesk silsek silske sielks sielsk siekls sieksl sieskl sieslk sislek sislke
siselk sisekl siskel siskle slikes slikse slieks sliesk slisek sliske slkies
slkise slkeis slkesi slksei slksie slekis sleksi sleiks sleisk slesik sleski
slskei slskie slseki slseik slsiek slsike seilks seilsk seikls seiksl seiskl
seislk seliks selisk selkis selksi selski selsik seklis seklsi sekils sekisl
seksil seksli seslki seslik seskli seskil sesikl sesilk ssilek ssilke ssielk
ssiekl ssikel ssikle ssliek sslike ssleik ssleki sslkei sslkie sselik sselki
sseilk sseikl ssekil ssekli ssklei ssklie sskeli sskeil sskiel sskile ksiles
ksilse ksiels ksiesl ksisel ksisle kslies kslise ksleis kslesi kslsei kslsie
kselis kselsi kseils kseisl ksesil ksesli ksslei ksslie ksseli ksseil kssiel
kssile kisles kislse kisels kisesl kissel kissle kilses kilsse kiless kiless
kilses kilsse kielss kielss kiesls kiessl kiessl kiesls kisles kislse kisels
kisesl kissel kissle klises klisse kliess kliess klises klisse klsies klsise
klseis klsesi klssei klssie klesis klessi kleiss kleiss klesis klessi klssei
klssie klsesi klseis klsies klsise keilss keilss keisls keissl keissl keisls
keliss keliss kelsis kelssi kelssi kelsis keslis keslsi kesils kesisl kessil
kessli keslsi keslis kessli kessil kesisl kesils ksiles ksilse ksiels ksiesl
ksisel ksisle kslies kslise ksleis kslesi kslsei kslsie kselis kselsi kseils
kseisl ksesil ksesli ksslei ksslie ksseli ksseil kssiel kssile iksles ikslse
iksels iksesl ikssel ikssle iklses iklsse ikless ikless iklses iklsse ikelss
ikelss ikesls ikessl ikessl ikesls iksles ikslse iksels iksesl ikssel ikssle
iskles isklse iskels iskesl isksel isksle islkes islkse isleks islesk islsek
islske iselks iselsk isekls iseksl iseskl iseslk isslek isslke isselk issekl
isskel isskle ilskes ilskse ilseks ilsesk ilssek ilsske ilkses ilksse ilkess
ilkess ilkses ilksse ilekss ilekss ilesks ilessk ilessk ilesks ilskes ilskse
ilseks ilsesk ilssek ilsske ieslks ieslsk ieskls iesksl iesskl iesslk ielsks
ielssk ielkss ielkss ielsks ielssk ieklss ieklss ieksls iekssl iekssl ieksls
ieslks ieslsk ieskls iesksl iesskl iesslk isslek isslke isselk issekl isskel
isskle islsek islske islesk isleks islkes islkse iselsk iselks iseslk iseskl
iseksl isekls iskles isklse iskels iskesl isksel isksle lkises lkisse lkiess
lkiess lkises lkisse lksies lksise lkseis lksesi lkssei lkssie lkesis lkessi
lkeiss lkeiss lkesis lkessi lkssei lkssie lksesi lkseis lksies lksise likses
liksse likess likess likses liksse liskes liskse liseks lisesk lissek lisske
liesks liessk liekss liekss liesks liessk lissek lisske lisesk liseks liskes
liskse lsikes lsikse lsieks lsiesk lsisek lsiske lskies lskise lskeis lskesi
lsksei lsksie lsekis lseksi lseiks lseisk lsesik lseski lsskei lsskie lsseki
lsseik lssiek lssike leisks leissk leikss leikss leisks leissk lesiks lesisk
leskis lesksi lesski lessik leksis lekssi lekiss lekiss leksis lekssi lesski
lessik lesksi leskis lesiks lesisk lsisek lsiske lsiesk lsieks lsikes lsikse
lssiek lssike lsseik lsseki lsskei lsskie lsesik lseski lseisk lseiks lsekis
lseksi lsksei lsksie lskesi lskeis lskies lskise ekilss ekilss ekisls ekissl
ekissl ekisls ekliss ekliss eklsis eklssi eklssi eklsis ekslis ekslsi eksils
eksisl ekssil ekssli ekslsi ekslis ekssli ekssil eksisl eksils eiklss eiklss
eiksls eikssl eikssl eiksls eilkss eilkss eilsks eilssk eilssk eilsks eislks
eislsk eiskls eisksl eisskl eisslk eislsk eislks eisslk eisskl eisksl eiskls
elikss elikss elisks elissk elissk elisks elkiss elkiss elksis elkssi elkssi
elksis elskis elsksi elsiks elsisk elssik elsski elsksi elskis elsski elssik
elsisk elsiks esilks esilsk esikls esiksl esiskl esislk esliks eslisk eslkis
eslksi eslski eslsik esklis esklsi eskils eskisl esksil esksli esslki esslik
esskli esskil essikl essilk esilsk esilks esislk esiskl esiksl esikls eslisk
esliks eslsik eslski eslksi eslkis esslik esslki essilk essikl esskil esskli
esklsi esklis esksli esksil eskisl eskils skiles skilse skiels skiesl skisel
skisle sklies sklise skleis sklesi sklsei sklsie skelis skelsi skeils skeisl
skesil skesli skslei skslie skseli skseil sksiel sksile sikles siklse sikels
sikesl siksel siksle silkes silkse sileks silesk silsek silske sielks sielsk
siekls sieksl sieskl sieslk sislek sislke siselk sisekl siskel siskle slikes
slikse slieks sliesk slisek sliske slkies slkise slkeis slkesi slksei slksie
slekis sleksi sleiks sleisk slesik sleski slskei slskie slseki slseik slsiek
slsike seilks seilsk seikls seiksl seiskl seislk seliks selisk selkis selksi
selski selsik seklis seklsi sekils sekisl seksil seksli seslki seslik seskli
seskil sesikl sesilk ssilek ssilke ssielk ssiekl ssikel ssikle ssliek sslike
ssleik ssleki sslkei sslkie sselik sselki sseilk sseikl ssekil ssekli ssklei
ssklie sskeli sskeil sskiel sskile

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

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