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popular ciphers:

alienages

conventusque

underking

mothra

folkmots

nerkuu

misanswer

carnes

tortuously

dragees

upgirding

vagabatur

pelikowsky

manuf

foedamus

verilog

whichway

creamily


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: totter
cipher variations:
upuufs vqvvgt wrwwhu xsxxiv ytyyjw
zuzzkx avaaly bwbbmz cxccna dyddob
ezeepc faffqd gbggre hchhsf idiitg
jejjuh kfkkvi lgllwj mhmmxk ninnyl
ojoozm pkppan qlqqbo rmrrcp snssdq

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: totter
Cipher: glggvi

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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: totter
Cipher: BAABA ABBAB BAABA BAABA AABAA 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: totter
cipher variations:
upuufsgrggnastssvieveedqqxqqlyczcctgadaajwmfmmre
yhyyzmkjkkhuwlwwpciniixkvqvvgthshhobtuttwjfwffer
ryrrmzdadduhbebbkxngnnsfzizzanlkllivxmxxqdjojjyl
wrwwhuitiipcuvuuxkgxggfsszssnaebeevicfcclyohootg
ajaabomlmmjwynyyrekpkkzmxsxxivjujjqdvwvvylhyhhgt
tattobfcffwjdgddmzpippuhbkbbcpnmnnkxzozzsflqllan
ytyyjwkvkkrewxwwzmiziihuubuupcgdggxkeheenaqjqqvi
clccdqonoolyapaatgmrmmbozuzzkxlwllsfxyxxanjajjiv
vcvvqdhehhylfiffobrkrrwjdmdderpoppmzbqbbuhnsnncp
avaalymxmmtgyzyybokbkkjwwdwwreifiizmgjggpcslssxk
eneefsqpqqnacrccviotoodqbwbbmznynnuhzazzcplcllkx
xexxsfjgjjanhkhhqdtmttylfoffgtrqrrobdsddwjpupper
cxccnaozooviabaadqmdmmlyyfyytgkhkkboiliireunuuzm
gpgghusrsspceteexkqvqqfsdyddobpappwjbcbbernennmz
zgzzuhlillcpjmjjsfvovvanhqhhivtsttqdfuffylrwrrgt
ezeepcqbqqxkcdccfsofoonaahaavimjmmdqknkktgwpwwbo
iriijwutuuregvggzmsxsshufaffqdrcrryldeddgtpgppob
bibbwjnknnerlolluhxqxxcpjsjjkxvuvvsfhwhhantyttiv
gbggresdsszmefeehuqhqqpccjccxkoloofsmpmmviyryydq
ktkklywvwwtgixiibouzuujwhchhsftettanfgffivrirrqd
dkddylpmppgtnqnnwjzszzerlullmzxwxxuhjyjjcpvavvkx
idiitgufuuboghggjwsjssreeleezmqnqqhuorooxkataafs
mvmmnayxyyvikzkkdqwbwwlyjejjuhvgvvcphihhkxtkttsf
fmffanrorrivpsppylbubbgtnwnnobzyzzwjlallerxcxxmz
kfkkviwhwwdqijiilyuluutggnggbospssjwqtqqzmcvcchu
oxoopcazaaxkmbmmfsydyynalgllwjxixxerjkjjmzvmvvuh
hohhcptqttkxrurrandwddivpyppqdbabbylncnngtzezzob
mhmmxkyjyyfsklkknawnwwviipiidquruulysvssboexeejw
qzqqrecbcczmodoohuafaapcninnylzkzzgtlmllobxoxxwj
jqjjervsvvmztwttcpfyffkxrarrsfdcddanpeppivbgbbqd
ojoozmalaahumnmmpcypyyxkkrkkfswtwwnauxuudqgzggly
sbsstgedeeboqfqqjwchccrepkppanbmbbivnonnqdzqzzyl
lsllgtxuxxobvyvverhahhmztcttuhfeffcprgrrkxdiddsf
qlqqbocnccjwopoorearaazmmtmmhuyvyypcwzwwfsibiina
uduuvigfggdqshsslyejeetgrmrrcpdoddkxpqppsfbsbban
nunnivzwzzqdxaxxgtjcjjobvevvwjhghhertittmzfkffuh
snssdqepeelyqrqqtgctccboovoojwaxaareybyyhukdkkpc
wfwwxkihiifsujuunaglggvitotterfqffmzrsrruhduddcp
pwppkxbybbsfzczzivlellqdxgxxyljijjgtvkvvobhmhhwj

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: totter
Cipher: gbggre

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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: totter
Cipher: 444344445124

Extended Methods:
Method #1

Plaintext: totter
method variations:
ytyykwdyddpbidiiugoioozm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
t o t t e r 
4 4 4 4 5 2 
4 3 4 4 1 4 
They are then read out in rows:
444452434414
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: totter
Cipher: ttkotq

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Method #3

Plaintext: totter
method variations:
tstyft styftt tyftts
yfttst fttsty ttstyf

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: totter

all 720 cipher variations:
totter tottre totetr totert totret totrte totter tottre totetr totert totret
totrte toettr toetrt toettr toetrt toertt toertt tortet tortte torett torett
tortet tortte ttoter ttotre ttoetr ttoert ttoret ttorte tttoer tttore ttteor
tttero tttreo tttroe ttetor ttetro tteotr tteort tterot tterto ttrteo ttrtoe
ttreto ttreot ttroet ttrote tttoer tttore ttteor tttero tttreo tttroe ttoter
ttotre ttoetr ttoert ttoret ttorte tteotr tteort ttetor ttetro tterto tterot
ttroet ttrote ttreot ttreto ttrteo ttrtoe tettor tettro tetotr tetort tetrot
tetrto tettor tettro tetotr tetort tetrot tetrto teottr teotrt teottr teotrt
teortt teortt tertot tertto terott terott tertot tertto trtteo trttoe trteto
trteot trtoet trtote trtteo trttoe trteto trteot trtoet trtote tretto tretot
tretto tretot treott treott trotet trotte troett troett trotet trotte ottter
otttre ottetr ottert ottret ottrte ottter otttre ottetr ottert ottret ottrte
otettr otetrt otettr otetrt otertt otertt otrtet otrtte otrett otrett otrtet
otrtte ottter otttre ottetr ottert ottret ottrte ottter otttre ottetr ottert
ottret ottrte otettr otetrt otettr otetrt otertt otertt otrtet otrtte otrett
otrett otrtet otrtte ottter otttre ottetr ottert ottret ottrte ottter otttre
ottetr ottert ottret ottrte otettr otetrt otettr otetrt otertt otertt otrtet
otrtte otrett otrett otrtet otrtte oetttr oettrt oetttr oettrt oetrtt oetrtt
oetttr oettrt oetttr oettrt oetrtt oetrtt oetttr oettrt oetttr oettrt oetrtt
oetrtt oerttt oerttt oerttt oerttt oerttt oerttt orttet orttte ortett ortett
orttet orttte orttet orttte ortett ortett orttet orttte orettt orettt orettt
orettt orettt orettt orttet orttte ortett ortett orttet orttte totter tottre
totetr totert totret totrte totter tottre totetr totert totret totrte toettr
toetrt toettr toetrt toertt toertt tortet tortte torett torett tortet tortte
ttoter ttotre ttoetr ttoert ttoret ttorte tttoer tttore ttteor tttero tttreo
tttroe ttetor ttetro tteotr tteort tterot tterto ttrteo ttrtoe ttreto ttreot
ttroet ttrote tttoer tttore ttteor tttero tttreo tttroe ttoter ttotre ttoetr
ttoert ttoret ttorte tteotr tteort ttetor ttetro tterto tterot ttroet ttrote
ttreot ttreto ttrteo ttrtoe tettor tettro tetotr tetort tetrot tetrto tettor
tettro tetotr tetort tetrot tetrto teottr teotrt teottr teotrt teortt teortt
tertot tertto terott terott tertot tertto trtteo trttoe trteto trteot trtoet
trtote trtteo trttoe trteto trteot trtoet trtote tretto tretot tretto tretot
treott treott trotet trotte troett troett trotet trotte totter tottre totetr
totert totret totrte totter tottre totetr totert totret totrte toettr toetrt
toettr toetrt toertt toertt tortet tortte torett torett tortet tortte ttoter
ttotre ttoetr ttoert ttoret ttorte tttoer tttore ttteor tttero tttreo tttroe
ttetor ttetro tteotr tteort tterot tterto ttrteo ttrtoe ttreto ttreot ttroet
ttrote tttoer tttore ttteor tttero tttreo tttroe ttoter ttotre ttoetr ttoert
ttoret ttorte tteotr tteort ttetor ttetro tterto tterot ttroet ttrote ttreot
ttreto ttrteo ttrtoe tettor tettro tetotr tetort tetrot tetrto tettor tettro
tetotr tetort tetrot tetrto teottr teotrt teottr teotrt teortt teortt tertot
tertto terott terott tertot tertto trtteo trttoe trteto trteot trtoet trtote
trtteo trttoe trteto trteot trtoet trtote tretto tretot tretto tretot treott
treott trotet trotte troett troett trotet trotte eotttr eottrt eotttr eottrt
eotrtt eotrtt eotttr eottrt eotttr eottrt eotrtt eotrtt eotttr eottrt eotttr
eottrt eotrtt eotrtt eorttt eorttt eorttt eorttt eorttt eorttt etottr etotrt
etottr etotrt etortt etortt ettotr ettort etttor etttro ettrto ettrot etttor
etttro ettotr ettort ettrot ettrto etrtto etrtot etrtto etrtot etrott etrott
ettotr ettort etttor etttro ettrto ettrot etottr etotrt etottr etotrt etortt
etortt ettotr ettort etttor etttro ettrto ettrot etrott etrott etrtot etrtto
etrtto etrtot etttor etttro ettotr ettort ettrot ettrto etttor etttro ettotr
ettort ettrot ettrto etottr etotrt etottr etotrt etortt etortt etrtot etrtto
etrott etrott etrtot etrtto erttto erttot erttto erttot ertott ertott erttto
erttot erttto erttot ertott ertott erttto erttot erttto erttot ertott ertott
erottt erottt erottt erottt erottt erottt rottet rottte rotett rotett rottet
rottte rottet rottte rotett rotett rottet rottte roettt roettt roettt roettt
roettt roettt rottet rottte rotett rotett rottet rottte rtotet rtotte rtoett
rtoett rtotet rtotte rttoet rttote rtteot rtteto rttteo rtttoe rtetot rtetto
rteott rteott rtetot rtetto rttteo rtttoe rtteto rtteot rttoet rttote rttoet
rttote rtteot rtteto rttteo rtttoe rtotet rtotte rtoett rtoett rtotet rtotte
rteott rteott rtetot rtetto rtetto rtetot rttoet rttote rtteot rtteto rttteo
rtttoe rettot rettto retott retott rettot rettto rettot rettto retott retott
rettot rettto reottt reottt reottt reottt reottt reottt rettot rettto retott
retott rettot rettto rttteo rtttoe rtteto rtteot rttoet rttote rttteo rtttoe
rtteto rtteot rttoet rttote rtetto rtetot rtetto rtetot rteott rteott rtotet
rtotte rtoett rtoett rtotet rtotte

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