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annulled


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: cerezo
cipher variations:
dfsfap egtgbq fhuhcr givids hjwjet
ikxkfu jlylgv kmzmhw lnanix mobojy
npcpkz oqdqla prermb qsfsnc rtgtod
suhupe tvivqf uwjwrg vxkxsh wylyti
xzmzuj yanavk zbobwl acpcxm bdqdyn

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: cerezo
Cipher: xvival

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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: cerezo
Cipher: AAABA AABAA BAAAA AABAA BABBB ABBAB

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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: cerezo
cipher variations:
dfsfaphnanyrlvivwtpdqduvtlylsxxtgtqzfjwjmdjrerkf
nzmzihrhuhgjvpcpelzxkxcnegtgbqiobozsmwjwxuqerevw
umzmtyyuhuragkxkneksfslgoanajisivihkwqdqfmaylydo
fhuhcrjpcpatnxkxyvrfsfwxvnanuzzvivsbhlylofltgtmh
pbobkjtjwjilxrergnbzmzepgividskqdqbuoylyzwsgtgxy
wobovaawjwtcimzmpgmuhuniqcpclkukxkjmysfshocanafq
hjwjetlrercvpzmzaxthuhyzxpcpwbbxkxudjnanqhnvivoj
rdqdmlvlylknztgtipdbobgrikxkfumsfsdwqanabyuiviza
yqdqxccylyvekoboriowjwpkserenmwmzmloauhujqecpchs
jlylgvntgtexrbobczvjwjabzreryddzmzwflpcpsjpxkxql
tfsfonxnanmpbvivkrfdqditkmzmhwouhufyscpcdawkxkbc
asfszeeanaxgmqdqtkqylyrmugtgpoyobonqcwjwlsgereju
lnanixpvivgztdqdebxlylcdbtgtaffbobyhnrerulrzmzsn
vhuhqpzpcpordxkxmthfsfkvmobojyqwjwhauerefcymzmde
cuhubggcpcziosfsvmsanatowivirqaqdqpseylynuigtglw
npcpkzrxkxibvfsfgdznanefdvivchhdqdajptgtwntbobup
xjwjsrbrerqtfzmzovjhuhmxoqdqlasylyjcwgtgheaobofg
ewjwdiierebkquhuxoucpcvqykxktscsfsruganapwkiviny
prermbtzmzkdxhuhifbpcpghfxkxejjfsfclrvivypvdqdwr
zlylutdtgtsvhbobqxljwjozqsfsncuanaleyivijgcqdqhi
gylyfkkgtgdmswjwzqwerexsamzmvueuhutwicpcrymkxkpa
rtgtodvbobmfzjwjkhdrerijhzmzgllhuhentxkxarxfsfyt
bnanwvfvivuxjdqdsznlylqbsuhupewcpcngakxkliesfsjk
ianahmmivifouylybsygtgzucoboxwgwjwvykeretaomzmrc
tvivqfxdqdohblylmjftgtkljbobinnjwjgpvzmzctzhuhav
dpcpyxhxkxwzlfsfubpnansduwjwrgyerepicmzmnkguhulm
kcpcjookxkhqwanaduaivibweqdqzyiylyxamgtgvcqobote
vxkxshzfsfqjdnanolhvivmnldqdkpplylirxbobevbjwjcx
frerazjzmzybnhuhwdrpcpufwylytiagtgrkeobopmiwjwno
merelqqmzmjsycpcfwckxkdygsfsbakanazcoivixesqdqvg
xzmzujbhuhslfpcpqnjxkxopnfsfmrrnanktzdqdgxdlylez
htgtcblbobadpjwjyftrerwhyanavkcivitmgqdqrokylypq
ogtgnssoboluaerehyemzmfaiuhudcmcpcbeqkxkzgusfsxi
zbobwldjwjunhrersplzmzqrphuhottpcpmvbfsfizfnangb
jvivedndqdcfrlylahvtgtyjacpcxmekxkvoisfstqmanars
qivipuuqdqnwcgtgjagobohckwjwfeoeredgsmzmbiwuhuzk
bdqdynflylwpjtgturnbobstrjwjqvvreroxdhuhkbhpcpid
lxkxgfpfsfehtnancjxvivalcerezogmzmxqkuhuvsocpctu
skxkrwwsfspyeivilciqdqjemylyhgqgtgfiuobodkywjwbm

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: cerezo
Cipher: prermb

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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: cerezo
Cipher: 315124515543

Extended Methods:
Method #1

Plaintext: cerezo
method variations:
hkwketnpbpkysugupdxzmzui

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
c e r e z o 
3 5 2 5 5 4 
1 1 4 1 5 3 
They are then read out in rows:
352554114153
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: cerezo
Cipher: xwuadp

Read more ...
Method #3

Plaintext: cerezo
method variations:
vfyvun fyvunv yvunvf
vunvfy unvfyv nvfyvu

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: cerezo

all 720 cipher variations:
cerezo cereoz cerzeo cerzoe ceroze ceroez ceerzo ceeroz ceezro ceezor ceeozr
ceeorz cezero cezeor cezreo cezroe cezore cezoer ceoezr ceoerz ceozer ceozre
ceorze ceorez creezo creeoz crezeo crezoe creoze creoez creezo creeoz crezeo
crezoe creoze creoez crzeeo crzeoe crzeeo crzeoe crzoee crzoee croeze croeez
crozee crozee croeze croeez cerezo cereoz cerzeo cerzoe ceroze ceroez ceerzo
ceeroz ceezro ceezor ceeozr ceeorz cezero cezeor cezreo cezroe cezore cezoer
ceoezr ceoerz ceozer ceozre ceorze ceorez czreeo czreoe czreeo czreoe czroee
czroee czereo czeroe czeero czeeor czeoer czeore czeero czeeor czereo czeroe
czeore czeoer czoeer czoere czoeer czoere czoree czoree coreze coreez corzee
corzee coreze coreez coerze coerez coezre coezer coeezr coeerz cozere cozeer
cozree cozree cozere cozeer coeezr coeerz coezer coezre coerze coerez ecrezo
ecreoz ecrzeo ecrzoe ecroze ecroez ecerzo eceroz ecezro ecezor eceozr eceorz
eczero eczeor eczreo eczroe eczore eczoer ecoezr ecoerz ecozer ecozre ecorze
ecorez ercezo erceoz erczeo erczoe ercoze ercoez ereczo erecoz erezco erezoc
ereozc ereocz erzeco erzeoc erzceo erzcoe erzoce erzoec eroezc eroecz erozec
erozce erocze erocez eerczo eercoz eerzco eerzoc eerozc eerocz eecrzo eecroz
eeczro eeczor eecozr eecorz eezcro eezcor eezrco eezroc eezorc eezocr eeoczr
eeocrz eeozcr eeozrc eeorzc eeorcz ezreco ezreoc ezrceo ezrcoe ezroce ezroec
ezerco ezeroc ezecro ezecor ezeocr ezeorc ezcero ezceor ezcreo ezcroe ezcore
ezcoer ezoecr ezoerc ezocer ezocre ezorce ezorec eorezc eorecz eorzec eorzce
eorcze eorcez eoerzc eoercz eoezrc eoezcr eoeczr eoecrz eozerc eozecr eozrec
eozrce eozcre eozcer eocezr eocerz eoczer eoczre eocrze eocrez recezo receoz
reczeo reczoe recoze recoez reeczo reecoz reezco reezoc reeozc reeocz rezeco
rezeoc rezceo rezcoe rezoce rezoec reoezc reoecz reozec reozce reocze reocez
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reozec reozce reocze reocez rzceeo rzceoe rzceeo rzceoe rzcoee rzcoee rzeceo
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ezcero ezceor ezcoer ezcore ezecro ezecor ezerco ezeroc ezeorc ezeocr ezocer
ezocre ezoecr ezoerc ezorec ezorce eorcze eorcez eorzce eorzec eorezc eorecz
eocrze eocrez eoczre eoczer eocezr eocerz eozcre eozcer eozrce eozrec eozerc
eozecr eoeczr eoecrz eoezcr eoezrc eoerzc eoercz zereco zereoc zerceo zercoe
zeroce zeroec zeerco zeeroc zeecro zeecor zeeocr zeeorc zecero zeceor zecreo
zecroe zecore zecoer zeoecr zeoerc zeocer zeocre zeorce zeorec zreeco zreeoc
zreceo zrecoe zreoce zreoec zreeco zreeoc zreceo zrecoe zreoce zreoec zrceeo
zrceoe zrceeo zrceoe zrcoee zrcoee zroece zroeec zrocee zrocee zroece zroeec
zereco zereoc zerceo zercoe zeroce zeroec zeerco zeeroc zeecro zeecor zeeocr
zeeorc zecero zeceor zecreo zecroe zecore zecoer zeoecr zeoerc zeocer zeocre
zeorce zeorec zcreeo zcreoe zcreeo zcreoe zcroee zcroee zcereo zceroe zceero
zceeor zceoer zceore zceero zceeor zcereo zceroe zceore zceoer zcoeer zcoere
zcoeer zcoere zcoree zcoree zorece zoreec zorcee zorcee zorece zoreec zoerce
zoerec zoecre zoecer zoeecr zoeerc zocere zoceer zocree zocree zocere zoceer
zoeecr zoeerc zoecer zoecre zoerce zoerec oerezc oerecz oerzec oerzce oercze
oercez oeerzc oeercz oeezrc oeezcr oeeczr oeecrz oezerc oezecr oezrec oezrce
oezcre oezcer oecezr oecerz oeczer oeczre oecrze oecrez oreezc oreecz orezec
orezce orecze orecez oreezc oreecz orezec orezce orecze orecez orzeec orzece
orzeec orzece orzcee orzcee orceze orceez orczee orczee orceze orceez oerezc
oerecz oerzec oerzce oercze oercez oeerzc oeercz oeezrc oeezcr oeeczr oeecrz
oezerc oezecr oezrec oezrce oezcre oezcer oecezr oecerz oeczer oeczre oecrze
oecrez ozreec ozrece ozreec ozrece ozrcee ozrcee ozerec ozerce ozeerc ozeecr
ozecer ozecre ozeerc ozeecr ozerec ozerce ozecre ozecer ozceer ozcere ozceer
ozcere ozcree ozcree ocreze ocreez ocrzee ocrzee ocreze ocreez ocerze ocerez
ocezre ocezer oceezr oceerz oczere oczeer oczree oczree oczere oczeer oceezr
oceerz ocezer ocezre ocerze ocerez

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