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desperately

unmystical

saker

kocurii

volnereque

quesitive


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: zeftel
cipher variations:
afgufm bghvgn chiwho dijxip ejkyjq
fklzkr glmals hmnbmt inocnu jopdov
kpqepw lqrfqx mrsgry nsthsz otuita
puvjub qvwkvc rwxlwd sxymxe tyznyf
uzaozg vabpah wbcqbi xcdrcj ydesdk

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: zeftel
Cipher: avugvo

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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: zeftel
Cipher: BABBB AABAA AABAB BAABA AABAA ABABA

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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: zeftel
cipher variations:
afgufmynqgniwvasveudkedasluqlwqtectsmjyajkkrimrg
izsyzcghckhyepmwpucxwixqbghvgnzorhojxwbtwfvelfeb
tmvrmxrufdutnkzbkllsjnshjatzadhidlizfqnxqvdyxjyr
chiwhoapsipkyxcuxgwfmgfcunwsnysvgevuolaclmmtkoti
kbuabeijemjagroyrwezykzsdijxipbqtjqlzydvyhxgnhgd
voxtoztwhfwvpmbdmnnulpujlcvbcfjkfnkbhspzsxfazlat
ejkyjqcrukrmazewziyhoihewpyupauxigxwqncenoovmqvk
mdwcdgklgolcitqatygbambufklzkrdsvlsnbafxajzipjif
xqzvqbvyjhyxrodfoppwnrwlnexdehlmhpmdjurbuzhcbncv
glmalsetwmtocbgybkajqkjgyrawrcwzkizyspegpqqxosxm
ofyefimniqnekvscvaidcodwhmnbmtfuxnupdchzclbkrlkh
zsbxsdxaljaztqfhqrryptynpgzfgjnojroflwtdwbjedpex
inocnugvyovqediadmclsmliatcyteybmkbaurgirsszquzo
qhaghkopkspgmxuexckfeqfyjopdovhwzpwrfejbendmtnmj
budzufzcnlcbvshjsttarvapribhilpqltqhnyvfydlgfrgz
kpqepwixaqxsgfkcfoenuonkcveavgadomdcwtiktuubswbq
sjcijmqrmuriozwgzemhgshalqrfqxjybrythgldgpfovpol
dwfbwhbepnedxujluvvctxcrtkdjknrsnvsjpaxhafnihtib
mrsgrykzcszuihmehqgpwqpmexgcxicfqofeyvkmvwwduyds
uleklostowtkqbyibgojiujcnsthszladtavjinfirhqxrqn
fyhdyjdgrpgfzwlnwxxevzetvmflmptupxulrczjchpkjvkd
otuitambeubwkjogjsirysrogziezkehsqhgaxmoxyyfwafu
wngmnquvqyvmsdakdiqlkwlepuvjubncfvcxlkphktjsztsp
hajfalfitrihbynpyzzgxbgvxohnorvwrzwnteblejrmlxmf
qvwkvcodgwdymlqiluktautqibkgbmgjusjiczoqzaahychw
ypiopswxsaxoufcmfksnmyngrwxlwdpehxeznmrjmvlubvur
jclhcnhkvtkjdaprabbizdixzqjpqtxytbypvgdngltonzoh
sxymxeqfiyfaonsknwmvcwvskdmidoilwulkebqsbccjaejy
arkqruyzuczqwheohmupoapityznyfrgjzgbpotloxnwdxwt
lenjepjmxvmlfcrtcddkbfkzbslrsvzavdarxifpinvqpbqj
uzaozgshkahcqpumpyoxeyxumfokfqknywnmgdsudeelcgla
ctmstwabwebsyjgqjowrqcrkvabpahtilbidrqvnqzpyfzyv
ngplgrlozxonhetveffmdhmbduntuxbcxfctzkhrkpxsrdsl
wbcqbiujmcjesrworaqzgazwohqmhsmpaypoifuwfggneinc
evouvycdygdualislqytsetmxcdrcjvkndkftsxpsbrahbax
pirnitnqbzqpjgvxghhofjodfwpvwzdezhevbmjtmrzutfun
ydesdkwloelgutyqtcsbicbyqjsojuorcarqkhwyhiipgkpe
gxqwxaefaifwcnkunsavugvozeftelxmpfmhvuzrudtcjdcz
rktpkvpsdbsrlixzijjqhlqfhyrxybfgbjgxdolvotbwvhwp

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: zeftel
Cipher: mrsgry

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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: zeftel
Cipher: 555112445113

Extended Methods:
Method #1

Plaintext: zeftel
method variations:
eklykqkpqdpvpuviuauzaozf

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
z e f t e l 
5 5 1 4 5 1 
5 1 2 4 1 3 
They are then read out in rows:
551451512413
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: zeftel
Cipher: zqeerl

Read more ...
Method #3

Plaintext: zeftel
method variations:
zaryax aryaxz ryaxza
yaxzar axzary xzarya

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: zeftel

all 720 cipher variations:
zeftel zeftle zefetl zefelt zeflet zeflte zetfel zetfle zetefl zetelf zetlef
zetlfe zeetfl zeetlf zeeftl zeeflt zeelft zeeltf zeltef zeltfe zeletf zeleft
zelfet zelfte zfetel zfetle zfeetl zfeelt zfelet zfelte zfteel zftele zfteel
zftele zftlee zftlee zfetel zfetle zfeetl zfeelt zfelet zfelte zfltee zfltee
zflete zfleet zfleet zflete ztfeel ztfele ztfeel ztfele ztflee ztflee ztefel
ztefle zteefl zteelf ztelef ztelfe zteefl zteelf ztefel ztefle ztelfe ztelef
ztleef ztlefe ztleef ztlefe ztlfee ztlfee zeftel zeftle zefetl zefelt zeflet
zeflte zetfel zetfle zetefl zetelf zetlef zetlfe zeetfl zeetlf zeeftl zeeflt
zeelft zeeltf zeltef zeltfe zeletf zeleft zelfet zelfte zlftee zlftee zlfete
zlfeet zlfeet zlfete zltfee zltfee zltefe zlteef zlteef zltefe zletfe zletef
zlefte zlefet zleeft zleetf zletef zletfe zleetf zleeft zlefet zlefte ezftel
ezftle ezfetl ezfelt ezflet ezflte eztfel eztfle eztefl eztelf eztlef eztlfe
ezetfl ezetlf ezeftl ezeflt ezelft ezeltf ezltef ezltfe ezletf ezleft ezlfet
ezlfte efztel efztle efzetl efzelt efzlet efzlte eftzel eftzle eftezl eftelz
eftlez eftlze efetzl efetlz efeztl efezlt efelzt efeltz efltez efltze efletz
eflezt eflzet eflzte etfzel etfzle etfezl etfelz etflez etflze etzfel etzfle
etzefl etzelf etzlef etzlfe etezfl etezlf etefzl eteflz etelfz etelzf etlzef
etlzfe etlezf etlefz etlfez etlfze eeftzl eeftlz eefztl eefzlt eeflzt eefltz
eetfzl eetflz eetzfl eetzlf eetlzf eetlfz eeztfl eeztlf eezftl eezflt eezlft
eezltf eeltzf eeltfz eelztf eelzft eelfzt eelftz elftez elftze elfetz elfezt
elfzet elfzte eltfez eltfze eltefz eltezf eltzef eltzfe eletfz eletzf eleftz
elefzt elezft eleztf elztef elztfe elzetf elzeft elzfet elzfte feztel feztle
fezetl fezelt fezlet fezlte fetzel fetzle fetezl fetelz fetlez fetlze feetzl
feetlz feeztl feezlt feelzt feeltz feltez feltze feletz felezt felzet felzte
fzetel fzetle fzeetl fzeelt fzelet fzelte fzteel fztele fzteel fztele fztlee
fztlee fzetel fzetle fzeetl fzeelt fzelet fzelte fzltee fzltee fzlete fzleet
fzleet fzlete ftzeel ftzele ftzeel ftzele ftzlee ftzlee ftezel ftezle fteezl
fteelz ftelez ftelze fteezl fteelz ftezel ftezle ftelze ftelez ftleez ftleze
ftleez ftleze ftlzee ftlzee feztel feztle fezetl fezelt fezlet fezlte fetzel
fetzle fetezl fetelz fetlez fetlze feetzl feetlz feeztl feezlt feelzt feeltz
feltez feltze feletz felezt felzet felzte flztee flztee flzete flzeet flzeet
flzete fltzee fltzee flteze flteez flteez flteze fletze fletez flezte flezet
fleezt fleetz fletez fletze fleetz fleezt flezet flezte tefzel tefzle tefezl
tefelz teflez teflze tezfel tezfle tezefl tezelf tezlef tezlfe teezfl teezlf
teefzl teeflz teelfz teelzf telzef telzfe telezf telefz telfez telfze tfezel
tfezle tfeezl tfeelz tfelez tfelze tfzeel tfzele tfzeel tfzele tfzlee tfzlee
tfezel tfezle tfeezl tfeelz tfelez tfelze tflzee tflzee tfleze tfleez tfleez
tfleze tzfeel tzfele tzfeel tzfele tzflee tzflee tzefel tzefle tzeefl tzeelf
tzelef tzelfe tzeefl tzeelf tzefel tzefle tzelfe tzelef tzleef tzlefe tzleef
tzlefe tzlfee tzlfee tefzel tefzle tefezl tefelz teflez teflze tezfel tezfle
tezefl tezelf tezlef tezlfe teezfl teezlf teefzl teeflz teelfz teelzf telzef
telzfe telezf telefz telfez telfze tlfzee tlfzee tlfeze tlfeez tlfeez tlfeze
tlzfee tlzfee tlzefe tlzeef tlzeef tlzefe tlezfe tlezef tlefze tlefez tleefz
tleezf tlezef tlezfe tleezf tleefz tlefez tlefze eeftzl eeftlz eefztl eefzlt
eeflzt eefltz eetfzl eetflz eetzfl eetzlf eetlzf eetlfz eeztfl eeztlf eezftl
eezflt eezlft eezltf eeltzf eeltfz eelztf eelzft eelfzt eelftz efetzl efetlz
efeztl efezlt efelzt efeltz eftezl eftelz eftzel eftzle eftlze eftlez efztel
efztle efzetl efzelt efzlet efzlte efltze efltez eflzte eflzet eflezt efletz
etfezl etfelz etfzel etfzle etflze etflez etefzl eteflz etezfl etezlf etelzf
etelfz etzefl etzelf etzfel etzfle etzlfe etzlef etlezf etlefz etlzef etlzfe
etlfze etlfez ezftel ezftle ezfetl ezfelt ezflet ezflte eztfel eztfle eztefl
eztelf eztlef eztlfe ezetfl ezetlf ezeftl ezeflt ezelft ezeltf ezltef ezltfe
ezletf ezleft ezlfet ezlfte elftze elftez elfzte elfzet elfezt elfetz eltfze
eltfez eltzfe eltzef eltezf eltefz elztfe elztef elzfte elzfet elzeft elzetf
eletzf eletfz eleztf elezft elefzt eleftz leftez leftze lefetz lefezt lefzet
lefzte letfez letfze letefz letezf letzef letzfe leetfz leetzf leeftz leefzt
leezft leeztf leztef leztfe lezetf lezeft lezfet lezfte lfetez lfetze lfeetz
lfeezt lfezet lfezte lfteez lfteze lfteez lfteze lftzee lftzee lfetez lfetze
lfeetz lfeezt lfezet lfezte lfztee lfztee lfzete lfzeet lfzeet lfzete ltfeez
ltfeze ltfeez ltfeze ltfzee ltfzee ltefez ltefze lteefz lteezf ltezef ltezfe
lteefz lteezf ltefez ltefze ltezfe ltezef ltzeef ltzefe ltzeef ltzefe ltzfee
ltzfee leftez leftze lefetz lefezt lefzet lefzte letfez letfze letefz letezf
letzef letzfe leetfz leetzf leeftz leefzt leezft leeztf leztef leztfe lezetf
lezeft lezfet lezfte lzftee lzftee lzfete lzfeet lzfeet lzfete lztfee lztfee
lztefe lzteef lzteef lztefe lzetfe lzetef lzefte lzefet lzeeft lzeetf lzetef
lzetfe lzeetf lzeeft lzefet lzefte

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

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