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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: piaski
cipher variations:
qjbtlj rkcumk sldvnl tmewom unfxpn
vogyqo wphzrp xqiasq yrjbtr zskcus
atldvt bumewu cvnfxv dwogyw exphzx
fyqiay gzrjbz haskca ibtldb jcumec
kdvnfd lewoge mfxphf ngyqig ohzrjh

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: piaski
Cipher: krzhpr

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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: piaski
Cipher: ABBBA ABAAA AAAAA BAAAB ABAAB ABAAA

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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: piaski
cipher variations:
qjbtljuzbdfzypbnzpcfbxtfgvbhnvklbrhlsrblvrwhbvph
axbfjxenbpdnidbzxdmtbjrtrkcumkvacegazqcoaqdgcyug
hwciowlmcsimtscmwsxicwqibycgkyfocqeojecayenucksu
sldvnlwbdfhbardpbrehdzvhixdjpxmndtjnutdnxtyjdxrj
czdhlzgpdrfpkfdbzfovdltvtmewomxcegicbseqcsfieawi
jyekqynoeukovueoyuzkeyskdaeimahqesgqlgecagpwemuw
unfxpnydfhjdctfrdtgjfbxjkzflrzopfvlpwvfpzvalfztl
ebfjnbirfthrmhfdbhqxfnvxvogyqozegikedugseuhkgcyk
lagmsapqgwmqxwgqawbmgaumfcgkocjsguisnigecirygowy
wphzrpafhjlfevhtfvilhdzlmbhntbqrhxnryxhrbxcnhbvn
gdhlpdkthvjtojhfdjszhpxzxqiasqbgikmgfwiugwjmieam
ncioucrsiyoszyiscydoicwoheimqeluiwkupkigektaiqya
yrjbtrchjlnhgxjvhxknjfbnodjpvdstjzptazjtdzepjdxp
ifjnrfmvjxlvqljhflubjrzbzskcusdikmoihykwiylokgco
pekqwetukaqubakueafqkeyqjgkosgnwkymwrmkigmvcksac
atldvtejlnpjizlxjzmplhdpqflrxfuvlbrvcblvfbgrlfzr
khlpthoxlznxsnljhnwdltbdbumewufkmoqkjamykanqmieq
rgmsygvwmcswdcmwgchsmgaslimquipymaoytomkioxemuce
cvnfxvglnprlkbnzlbornjfrshntzhwxndtxednxhditnhbt
mjnrvjqznbpzupnljpyfnvdfdwogywhmoqsmlcoamcpsokgs
tiouaixyoeuyfeoyiejuoicunkoswkraocqavqomkqzgoweg
exphzxinprtnmdpbndqtplhtujpvbjyzpfvzgfpzjfkvpjdv
olptxlsbpdrbwrpnlrahpxfhfyqiayjoqsuoneqcoeruqmiu
vkqwckzaqgwahgqakglwqkewpmquymtcqescxsqomsbiqygi
gzrjbzkprtvpofrdpfsvrnjvwlrxdlabrhxbihrblhmxrlfx
qnrvznudrftdytrpntcjrzhjhaskcalqsuwqpgseqgtwsokw
xmsyembcsiycjiscminysmgyroswaovesguezusqoudksaik
ibtldbmrtvxrqhtfrhuxtplxyntzfncdtjzdkjtdnjoztnhz
sptxbpwfthvfavtrpveltbjljcumecnsuwysriugsivyuqmy
zouagodeukaelkueokpauoiatquycqxguiwgbwusqwfmuckm
kdvnfdotvxztsjvhtjwzvrnzapvbhpefvlbfmlvfplqbvpjb
urvzdryhvjxhcxvtrxgnvdlnlewogepuwyautkwiukxawsoa
bqwciqfgwmcgnmwgqmrcwqkcvswaesziwkyidywusyhowemo
mfxphfqvxzbvulxjvlybxtpbcrxdjrghxndhonxhrnsdxrld
wtxbftajxlzjezxvtzipxfnpngyqigrwyacwvmykwmzcyuqc
dsyekshiyoeipoyisoteysmexuycgubkymakfaywuajqygoq
ohzrjhsxzbdxwnzlxnadzvrdetzfltijzpfjqpzjtpufztnf
yvzdhvclznblgbzxvbkrzhprpiaskityaceyxoamyobeawse
fuagmujkaqgkrqakuqvgauogzwaeiwdmaocmhcaywclsaiqs

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: piaski
Cipher: cvnfxv

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: piaski
Cipher: 534211345242

Extended Methods:
Method #1

Plaintext: piaski
method variations:
uofxpoztlcuteyqhzykdvned

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
p i a s k i 
5 4 1 3 5 4 
3 2 1 4 2 2 
They are then read out in rows:
541354321422
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: piaski
Cipher: uluhqg

Read more ...
Method #3

Plaintext: piaski
method variations:
sblyrw blyrws lyrwsb
yrwsbl rwsbly wsblyr

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: piaski

all 720 cipher variations:
piaski piasik piaksi piakis piaiks piaisk pisaki pisaik piskai piskia pisika
pisiak piksai piksia pikasi pikais pikias pikisa piiska piisak piiksa piikas
piiaks piiask paiski paisik paiksi paikis paiiks paiisk pasiki pasiik paskii
paskii pasiki pasiik paksii paksii pakisi pakiis pakiis pakisi paiski paisik
paiksi paikis paiiks paiisk psaiki psaiik psakii psakii psaiki psaiik psiaki
psiaik psikai psikia psiika psiiak pskiai pskiia pskaii pskaii pskiai pskiia
psiika psiiak psikia psikai psiaki psiaik pkasii pkasii pkaisi pkaiis pkaiis
pkaisi pksaii pksaii pksiai pksiia pksiia pksiai pkisai pkisia pkiasi pkiais
pkiias pkiisa pkisia pkisai pkiisa pkiias pkiais pkiasi piaski piasik piaksi
piakis piaiks piaisk pisaki pisaik piskai piskia pisika pisiak piksai piksia
pikasi pikais pikias pikisa piiska piisak piiksa piikas piiaks piiask ipaski
ipasik ipaksi ipakis ipaiks ipaisk ipsaki ipsaik ipskai ipskia ipsika ipsiak
ipksai ipksia ipkasi ipkais ipkias ipkisa ipiska ipisak ipiksa ipikas ipiaks
ipiask iapski iapsik iapksi iapkis iapiks iapisk iaspki iaspik iaskpi iaskip
iasikp iasipk iakspi iaksip iakpsi iakpis iakips iakisp iaiskp iaispk iaiksp
iaikps iaipks iaipsk isapki isapik isakpi isakip isaikp isaipk ispaki ispaik
ispkai ispkia ispika ispiak iskpai iskpia iskapi iskaip iskiap iskipa isipka
isipak isikpa isikap isiakp isiapk ikaspi ikasip ikapsi ikapis ikaips ikaisp
iksapi iksaip ikspai ikspia iksipa iksiap ikpsai ikpsia ikpasi ikpais ikpias
ikpisa ikispa ikisap ikipsa ikipas ikiaps ikiasp iiaskp iiaspk iiaksp iiakps
iiapks iiapsk iisakp iisapk iiskap iiskpa iispka iispak iiksap iikspa iikasp
iikaps iikpas iikpsa iipska iipsak iipksa iipkas iipaks iipask aipski aipsik
aipksi aipkis aipiks aipisk aispki aispik aiskpi aiskip aisikp aisipk aikspi
aiksip aikpsi aikpis aikips aikisp aiiskp aiispk aiiksp aiikps aiipks aiipsk
apiski apisik apiksi apikis apiiks apiisk apsiki apsiik apskii apskii apsiki
apsiik apksii apksii apkisi apkiis apkiis apkisi apiski apisik apiksi apikis
apiiks apiisk aspiki aspiik aspkii aspkii aspiki aspiik asipki asipik asikpi
asikip asiikp asiipk askipi askiip askpii askpii askipi askiip asiikp asiipk
asikip asikpi asipki asipik akpsii akpsii akpisi akpiis akpiis akpisi akspii
akspii aksipi aksiip aksiip aksipi akispi akisip akipsi akipis akiips akiisp
akisip akispi akiisp akiips akipis akipsi aipski aipsik aipksi aipkis aipiks
aipisk aispki aispik aiskpi aiskip aisikp aisipk aikspi aiksip aikpsi aikpis
aikips aikisp aiiskp aiispk aiiksp aiikps aiipks aiipsk siapki siapik siakpi
siakip siaikp siaipk sipaki sipaik sipkai sipkia sipika sipiak sikpai sikpia
sikapi sikaip sikiap sikipa siipka siipak siikpa siikap siiakp siiapk saipki
saipik saikpi saikip saiikp saiipk sapiki sapiik sapkii sapkii sapiki sapiik
sakpii sakpii sakipi sakiip sakiip sakipi saipki saipik saikpi saikip saiikp
saiipk spaiki spaiik spakii spakii spaiki spaiik spiaki spiaik spikai spikia
spiika spiiak spkiai spkiia spkaii spkaii spkiai spkiia spiika spiiak spikia
spikai spiaki spiaik skapii skapii skaipi skaiip skaiip skaipi skpaii skpaii
skpiai skpiia skpiia skpiai skipai skipia skiapi skiaip skiiap skiipa skipia
skipai skiipa skiiap skiaip skiapi siapki siapik siakpi siakip siaikp siaipk
sipaki sipaik sipkai sipkia sipika sipiak sikpai sikpia sikapi sikaip sikiap
sikipa siipka siipak siikpa siikap siiakp siiapk kiaspi kiasip kiapsi kiapis
kiaips kiaisp kisapi kisaip kispai kispia kisipa kisiap kipsai kipsia kipasi
kipais kipias kipisa kiispa kiisap kiipsa kiipas kiiaps kiiasp kaispi kaisip
kaipsi kaipis kaiips kaiisp kasipi kasiip kaspii kaspii kasipi kasiip kapsii
kapsii kapisi kapiis kapiis kapisi kaispi kaisip kaipsi kaipis kaiips kaiisp
ksaipi ksaiip ksapii ksapii ksaipi ksaiip ksiapi ksiaip ksipai ksipia ksiipa
ksiiap kspiai kspiia kspaii kspaii kspiai kspiia ksiipa ksiiap ksipia ksipai
ksiapi ksiaip kpasii kpasii kpaisi kpaiis kpaiis kpaisi kpsaii kpsaii kpsiai
kpsiia kpsiia kpsiai kpisai kpisia kpiasi kpiais kpiias kpiisa kpisia kpisai
kpiisa kpiias kpiais kpiasi kiaspi kiasip kiapsi kiapis kiaips kiaisp kisapi
kisaip kispai kispia kisipa kisiap kipsai kipsia kipasi kipais kipias kipisa
kiispa kiisap kiipsa kiipas kiiaps kiiasp iiaskp iiaspk iiaksp iiakps iiapks
iiapsk iisakp iisapk iiskap iiskpa iispka iispak iiksap iikspa iikasp iikaps
iikpas iikpsa iipska iipsak iipksa iipkas iipaks iipask iaiskp iaispk iaiksp
iaikps iaipks iaipsk iasikp iasipk iaskip iaskpi iaspki iaspik iaksip iakspi
iakisp iakips iakpis iakpsi iapski iapsik iapksi iapkis iapiks iapisk isaikp
isaipk isakip isakpi isapki isapik isiakp isiapk isikap isikpa isipka isipak
iskiap iskipa iskaip iskapi iskpai iskpia ispika ispiak ispkia ispkai ispaki
ispaik ikasip ikaspi ikaisp ikaips ikapis ikapsi iksaip iksapi iksiap iksipa
ikspia ikspai ikisap ikispa ikiasp ikiaps ikipas ikipsa ikpsia ikpsai ikpisa
ikpias ikpais ikpasi ipaski ipasik ipaksi ipakis ipaiks ipaisk ipsaki ipsaik
ipskai ipskia ipsika ipsiak ipksai ipksia ipkasi ipkais ipkias ipkisa ipiska
ipisak ipiksa ipikas ipiaks ipiask

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

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