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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: zonked
cipher variations:
apolfe bqpmgf crqnhg dsroih etspji
futqkj gvurlk hwvsml ixwtnm jyxuon
kzyvpo lazwqp mbaxrq ncbysr odczts
pedaut qfebvu rgfcwv shgdxw tiheyx
ujifzy vkjgaz wlkhba xmlicb ynmjdc

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: zonked
Cipher: almpvw

Read more ...

 

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: zonked
Cipher: BABBB ABBAB ABBAA ABAAB AABAA AAABB

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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: zonked
cipher variations:
apolfeyrofnkwtozvquvotdwsxonlcqzohtimdovjukfopra
ihojzggjodhmeloxpscnorxybqpmgfzspgolxupawrvwpuex
typomdrapiujnepwkvlgpqsbjipkahhkpeinfmpyqtdopsyz
crqnhgatqhpmyvqbxswxqvfyuzqpnesbqjvkofqxlwmhqrtc
kjqlbiilqfjognqzruepqtzadsroihburiqnzwrcytxyrwgz
varqoftcrkwlpgrymxnirsudlkrmcjjmrgkphorasvfqruab
etspjicvsjroaxsdzuyzsxhawbsrpgudslxmqhsznyojstve
mlsndkknshlqipsbtwgrsvbcfutqkjdwtkspbyteavzatyib
xctsqhvetmynritaozpktuwfnmtoellotimrjqtcuxhstwcd
gvurlkexultqczufbwabuzjcydutriwfunzosjubpaqluvxg
onupfmmpujnskrudvyituxdehwvsmlfyvmurdavgcxbcvakd
zevusjxgvoaptkvcqbrmvwyhpovqgnnqvkotlsvewzjuvyef
ixwtnmgzwnvsebwhdycdwbleafwvtkyhwpbqulwdrcsnwxzi
qpwrhoorwlpumtwfxakvwzfgjyxuonhaxowtfcxiezdexcmf
bgxwulzixqcrvmxesdtoxyajrqxsippsxmqvnuxgyblwxagh
kzyvpoibypxugdyjfaefydngchyxvmajyrdswnyfteupyzbk
srytjqqtynrwovyhzcmxybhilazwqpjczqyvhezkgbfgzeoh
dizywnbkzsetxozgufvqzacltszukrruzosxpwziadnyzcij
mbaxrqkdarzwifalhcghafpiejazxoclatfuypahvgwrabdm
utavlssvaptyqxajbeozadjkncbysrlebsaxjgbmidhibgqj
fkbaypdmbugvzqbiwhxsbcenvubwmttwbquzrybkcfpabekl
odcztsmfctbykhcnjeijchrkglcbzqencvhwarcjxiytcdfo
wvcxnuuxcrvaszcldgqbcflmpedautngduczlidokfjkdisl
hmdcarfodwixbsdkyjzudegpxwdyovvydswbtadmehrcdgmn
qfebvuohevdamjeplgklejtminedbsgpexjyctelzkavefhq
yxezpwwzetxcubenfisdehnorgfcwvpifwebnkfqmhlmfkun
jofecthqfykzdufmalbwfgirzyfaqxxafuydvcfogjtefiop
shgdxwqjgxfcolgrnimnglvokpgfduirgzlaevgnbmcxghjs
azgbryybgvzewdgphkufgjpqtiheyxrkhygdpmhsojnohmwp
lqhgevjshambfwhocndyhiktbahcszzchwafxehqilvghkqr
ujifzyslizheqnitpkopinxqmrihfwktibncgxipdoezijlu
cbidtaadixbgyfirjmwhilrsvkjgaztmjaifrojuqlpqjoyr
nsjigxlujcodhyjqepfajkmvdcjeubbejychzgjsknxijmst
wlkhbaunkbjgspkvrmqrkpzsotkjhymvkdpeizkrfqgbklnw
edkfvccfkzdiahktloyjkntuxmlicbvolckhtqlwsnrslqat
pulkiznwleqfjalsgrhclmoxfelgwddglaejbilumpzklouv
ynmjdcwpmdliurmxtostmrbuqvmljaoxmfrgkbmthsidmnpy
gfmhxeehmbfkcjmvnqalmpvwzonkedxqnemjvsnyuptunscv
rwnmkbpyngshlcnuitjenoqzhgniyffincgldknworbmnqwx

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: zonked
Cipher: mbaxrq

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: zonked
Cipher: 554333525141

Extended Methods:
Method #1

Plaintext: zonked
method variations:
etspkikyxupopdczutuihezy

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
z o n k e d 
5 4 3 5 5 4 
5 3 3 2 1 1 
They are then read out in rows:
543554533211
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: zonked
Cipher: uxupha

Read more ...
Method #3

Plaintext: zonked
method variations:
unxwqv nxwqvu xwqvun
wqvunx qvunxw vunxwq

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: zonked

all 720 cipher variations:
zonked zonkde zonekd zonedk zondek zondke zokned zoknde zokend zokedn zokden
zokdne zoeknd zoekdn zoenkd zoendk zoednk zoedkn zodken zodkne zodekn zodenk
zodnek zodnke znoked znokde znoekd znoedk znodek znodke znkoed znkode znkeod
znkedo znkdeo znkdoe znekod znekdo zneokd zneodk znedok znedko zndkeo zndkoe
zndeko zndeok zndoek zndoke zknoed zknode zkneod zknedo zkndeo zkndoe zkoned
zkonde zkoend zkoedn zkoden zkodne zkeond zkeodn zkenod zkendo zkedno zkedon
zkdoen zkdone zkdeon zkdeno zkdneo zkdnoe zenkod zenkdo zenokd zenodk zendok
zendko zeknod zekndo zekond zekodn zekdon zekdno zeoknd zeokdn zeonkd zeondk
zeodnk zeodkn zedkon zedkno zedokn zedonk zednok zednko zdnkeo zdnkoe zdneko
zdneok zdnoek zdnoke zdkneo zdknoe zdkeno zdkeon zdkoen zdkone zdekno zdekon
zdenko zdenok zdeonk zdeokn zdoken zdokne zdoekn zdoenk zdonek zdonke oznked
oznkde oznekd oznedk ozndek ozndke ozkned ozknde ozkend ozkedn ozkden ozkdne
ozeknd ozekdn ozenkd ozendk ozednk ozedkn ozdken ozdkne ozdekn ozdenk ozdnek
ozdnke onzked onzkde onzekd onzedk onzdek onzdke onkzed onkzde onkezd onkedz
onkdez onkdze onekzd onekdz onezkd onezdk onedzk onedkz ondkez ondkze ondekz
ondezk ondzek ondzke oknzed oknzde oknezd oknedz okndez okndze okzned okznde
okzend okzedn okzden okzdne okeznd okezdn okenzd okendz okednz okedzn okdzen
okdzne okdezn okdenz okdnez okdnze oenkzd oenkdz oenzkd oenzdk oendzk oendkz
oeknzd oekndz oekznd oekzdn oekdzn oekdnz oezknd oezkdn oeznkd oezndk oezdnk
oezdkn oedkzn oedknz oedzkn oedznk oednzk oednkz odnkez odnkze odnekz odnezk
odnzek odnzke odknez odknze odkenz odkezn odkzen odkzne odeknz odekzn odenkz
odenzk odeznk odezkn odzken odzkne odzekn odzenk odznek odznke nozked nozkde
nozekd nozedk nozdek nozdke nokzed nokzde nokezd nokedz nokdez nokdze noekzd
noekdz noezkd noezdk noedzk noedkz nodkez nodkze nodekz nodezk nodzek nodzke
nzoked nzokde nzoekd nzoedk nzodek nzodke nzkoed nzkode nzkeod nzkedo nzkdeo
nzkdoe nzekod nzekdo nzeokd nzeodk nzedok nzedko nzdkeo nzdkoe nzdeko nzdeok
nzdoek nzdoke nkzoed nkzode nkzeod nkzedo nkzdeo nkzdoe nkozed nkozde nkoezd
nkoedz nkodez nkodze nkeozd nkeodz nkezod nkezdo nkedzo nkedoz nkdoez nkdoze
nkdeoz nkdezo nkdzeo nkdzoe nezkod nezkdo nezokd nezodk nezdok nezdko nekzod
nekzdo nekozd nekodz nekdoz nekdzo neokzd neokdz neozkd neozdk neodzk neodkz
nedkoz nedkzo nedokz nedozk nedzok nedzko ndzkeo ndzkoe ndzeko ndzeok ndzoek
ndzoke ndkzeo ndkzoe ndkezo ndkeoz ndkoez ndkoze ndekzo ndekoz ndezko ndezok
ndeozk ndeokz ndokez ndokze ndoekz ndoezk ndozek ndozke konzed konzde konezd
konedz kondez kondze kozned koznde kozend kozedn kozden kozdne koeznd koezdn
koenzd koendz koednz koedzn kodzen kodzne kodezn kodenz kodnez kodnze knozed
knozde knoezd knoedz knodez knodze knzoed knzode knzeod knzedo knzdeo knzdoe
knezod knezdo kneozd kneodz knedoz knedzo kndzeo kndzoe kndezo kndeoz kndoez
kndoze kznoed kznode kzneod kznedo kzndeo kzndoe kzoned kzonde kzoend kzoedn
kzoden kzodne kzeond kzeodn kzenod kzendo kzedno kzedon kzdoen kzdone kzdeon
kzdeno kzdneo kzdnoe kenzod kenzdo kenozd kenodz kendoz kendzo keznod kezndo
kezond kezodn kezdon kezdno keoznd keozdn keonzd keondz keodnz keodzn kedzon
kedzno kedozn kedonz kednoz kednzo kdnzeo kdnzoe kdnezo kdneoz kdnoez kdnoze
kdzneo kdznoe kdzeno kdzeon kdzoen kdzone kdezno kdezon kdenzo kdenoz kdeonz
kdeozn kdozen kdozne kdoezn kdoenz kdonez kdonze eonkzd eonkdz eonzkd eonzdk
eondzk eondkz eoknzd eokndz eokznd eokzdn eokdzn eokdnz eozknd eozkdn eoznkd
eozndk eozdnk eozdkn eodkzn eodknz eodzkn eodznk eodnzk eodnkz enokzd enokdz
enozkd enozdk enodzk enodkz enkozd enkodz enkzod enkzdo enkdzo enkdoz enzkod
enzkdo enzokd enzodk enzdok enzdko endkzo endkoz endzko endzok endozk endokz
eknozd eknodz eknzod eknzdo ekndzo ekndoz ekonzd ekondz ekoznd ekozdn ekodzn
ekodnz ekzond ekzodn ekznod ekzndo ekzdno ekzdon ekdozn ekdonz ekdzon ekdzno
ekdnzo ekdnoz eznkod eznkdo eznokd eznodk ezndok ezndko ezknod ezkndo ezkond
ezkodn ezkdon ezkdno ezoknd ezokdn ezonkd ezondk ezodnk ezodkn ezdkon ezdkno
ezdokn ezdonk ezdnok ezdnko ednkzo ednkoz ednzko ednzok ednozk ednokz edknzo
edknoz edkzno edkzon edkozn edkonz edzkno edzkon edznko edznok edzonk edzokn
edokzn edoknz edozkn edoznk edonzk edonkz donkez donkze donekz donezk donzek
donzke doknez doknze dokenz dokezn dokzen dokzne doeknz doekzn doenkz doenzk
doeznk doezkn dozken dozkne dozekn dozenk doznek doznke dnokez dnokze dnoekz
dnoezk dnozek dnozke dnkoez dnkoze dnkeoz dnkezo dnkzeo dnkzoe dnekoz dnekzo
dneokz dneozk dnezok dnezko dnzkeo dnzkoe dnzeko dnzeok dnzoek dnzoke dknoez
dknoze dkneoz dknezo dknzeo dknzoe dkonez dkonze dkoenz dkoezn dkozen dkozne
dkeonz dkeozn dkenoz dkenzo dkezno dkezon dkzoen dkzone dkzeon dkzeno dkzneo
dkznoe denkoz denkzo denokz denozk denzok denzko deknoz deknzo dekonz dekozn
dekzon dekzno deoknz deokzn deonkz deonzk deoznk deozkn dezkon dezkno dezokn
dezonk deznok deznko dznkeo dznkoe dzneko dzneok dznoek dznoke dzkneo dzknoe
dzkeno dzkeon dzkoen dzkone dzekno dzekon dzenko dzenok dzeonk dzeokn dzoken
dzokne dzoekn dzoenk dzonek dzonke

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

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