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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: faizal
cipher variations:
gbjabm hckbcn idlcdo jemdep kfnefq
lgofgr mhpghs niqhit ojriju pksjkv
qltklw rmulmx snvmny townoz upxopa
vqypqb wrzqrc xsarsd ytbste zuctuf
avduvg bwevwh cxfwxi dygxyj ezhyzk

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: faizal
Cipher: uzrazo

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: faizal
Cipher: AABAB AAAAA ABAAA BABBB AAAAA 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: faizal
cipher variations:
gbjabmqbzybiabpwbekbfubaubvsbweblqbsybrmbkibhkbg
sbxibccbngbymbdebuwbtcbqhckbcnrcazcjbcqxcflcgvcb
vcwtcxfcmrctzcsncljcilchtcyjcddcohczncefcvxcudcr
idlcdosdbadkcdrydgmdhwdcwdxudygdnsduadtodmkdjmdi
udzkdeedpidaodfgdwydvedsjemdeptecbeldeszehneixed
xeyvezheotevbeupenleknejvealeffeqjebpeghexzewfet
kfnefqufdcfmeftafiofjyfeyfzwfaifpufwcfvqfomflofk
wfbmfggfrkfcqfhifyafxgfulgofgrvgedgnfgubgjpgkzgf
zgaxgbjgqvgxdgwrgpngmpglxgcnghhgslgdrgijgzbgyhgv
mhpghswhfehoghvchkqhlahgahbyhckhrwhyehxshqohnqhm
yhdohiihtmheshjkhachzihwniqhitxigfiphiwdilrimbih
biczidlisxizfiytirpiorinziepijjiuniftiklibdiajix
ojrijuyjhgjqijxejmsjncjicjdajemjtyjagjzujsqjpsjo
ajfqjkkjvojgujlmjcejbkjypksjkvzkihkrjkyfkntkodkj
dkebkfnkuzkbhkavktrkqtkpbkgrkllkwpkhvkmnkdfkclkz
qltklwaljilsklzgloulpelkelfclgolvalcilbwluslrulq
clhslmmlxqliwlnolegldmlarmulmxbmkjmtlmahmpvmqfml
fmgdmhpmwbmdjmcxmvtmsvmrdmitmnnmyrmjxmopmfhmenmb
snvmnycnlknumnbinqwnrgnmgnheniqnxcnekndynwuntwns
enjunoonzsnkynpqnginfonctownozdomlovnocjorxoshon
hoifojroydofloezoxvouxotfokvoppoatolzoqrohjogpod
upxopaepnmpwopdkpsyptipoipjgpkspzepgmpfapywpvypu
gplwpqqpbupmaprspikphqpevqypqbfqonqxpqelqtzqujqp
jqkhqltqafqhnqgbqzxqwzqvhqmxqrrqcvqnbqstqjlqirqf
wrzqrcgrporyqrfmruarvkrqkrlirmurbgriorhcrayrxarw
irnyrssrdwrocrturkmrjsrgxsarsdhsqpszrsgnsvbswlsr
lsmjsnvschsjpsidsbzsybsxjsozsttsexspdsuvslnsktsh
ytbsteitrqtasthotwctxmtsmtnktowtditkqtjetcatzcty
ktpatuutfytqetvwtmotlutizuctufjusrubtuipuxduynut
nuolupxuejulrukfudbuaduzluqbuvvugzurfuwxunpumvuj
avduvgkvtsvcuvjqvyevzovuovpmvqyvfkvmsvlgvecvbeva
mvrcvwwvhavsgvxyvoqvnwvkbwevwhlwutwdvwkrwzfwapwv
pwqnwrzwglwntwmhwfdwcfwbnwsdwxxwibwthwyzwprwoxwl
cxfwximxvuxewxlsxagxbqxwqxroxsaxhmxouxnixgexdgxc
oxtexyyxjcxuixzaxqsxpyxmdygxyjnywvyfxymtybhycryx
ryspytbyinypvyojyhfyehydpyufyzzykdyvjyabyrtyqzyn
ezhyzkozxwzgyznuzcizdszysztqzuczjozqwzpkzigzfize
qzvgzaazlezwkzbczsuzrazofaizalpayxahzaovadjaetaz
tauravdakparxaqlajhagjafrawhabbamfaxlacdatvasbap

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: faizal
Cipher: snvmny

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: faizal
Cipher: 121142551113

Extended Methods:
Method #1

Plaintext: faizal
method variations:
lfoefqqltklvvqypqaavduvf

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
f a i z a l 
1 1 4 5 1 1 
2 1 2 5 1 3 
They are then read out in rows:
114511212513
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: faizal
Cipher: ayabwl

Read more ...
Method #3

Plaintext: faizal
method variations:
bqweac qweacb weacbq
eacbqw acbqwe cbqwea

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: faizal

all 720 cipher variations:
faizal faizla faiazl faialz failaz failza fazial fazila fazail fazali fazlai
fazlia faazil faazli faaizl faailz faaliz faalzi falzai falzia falazi falaiz
faliaz faliza fiazal fiazla fiaazl fiaalz fialaz fialza fizaal fizala fizaal
fizala fizlaa fizlaa fiazal fiazla fiaazl fiaalz fialaz fialza filzaa filzaa
filaza filaaz filaaz filaza fziaal fziala fziaal fziala fzilaa fzilaa fzaial
fzaila fzaail fzaali fzalai fzalia fzaail fzaali fzaial fzaila fzalia fzalai
fzlaai fzlaia fzlaai fzlaia fzliaa fzliaa faizal faizla faiazl faialz failaz
failza fazial fazila fazail fazali fazlai fazlia faazil faazli faaizl faailz
faaliz faalzi falzai falzia falazi falaiz faliaz faliza flizaa flizaa fliaza
fliaaz fliaaz fliaza flziaa flziaa flzaia flzaai flzaai flzaia flazia flazai
flaiza flaiaz flaaiz flaazi flazai flazia flaazi flaaiz flaiaz flaiza afizal
afizla afiazl afialz afilaz afilza afzial afzila afzail afzali afzlai afzlia
afazil afazli afaizl afailz afaliz afalzi aflzai aflzia aflazi aflaiz afliaz
afliza aifzal aifzla aifazl aifalz aiflaz aiflza aizfal aizfla aizafl aizalf
aizlaf aizlfa aiazfl aiazlf aiafzl aiaflz aialfz aialzf ailzaf ailzfa ailazf
ailafz ailfaz ailfza azifal azifla aziafl azialf azilaf azilfa azfial azfila
azfail azfali azflai azflia azafil azafli azaifl azailf azalif azalfi azlfai
azlfia azlafi azlaif azliaf azlifa aaizfl aaizlf aaifzl aaiflz aailfz aailzf
aazifl aazilf aazfil aazfli aazlfi aazlif aafzil aafzli aafizl aafilz aafliz
aaflzi aalzfi aalzif aalfzi aalfiz aalifz aalizf alizaf alizfa aliazf aliafz
alifaz alifza alziaf alzifa alzaif alzafi alzfai alzfia alazif alazfi alaizf
alaifz alafiz alafzi alfzai alfzia alfazi alfaiz alfiaz alfiza iafzal iafzla
iafazl iafalz iaflaz iaflza iazfal iazfla iazafl iazalf iazlaf iazlfa iaazfl
iaazlf iaafzl iaaflz iaalfz iaalzf ialzaf ialzfa ialazf ialafz ialfaz ialfza
ifazal ifazla ifaazl ifaalz ifalaz ifalza ifzaal ifzala ifzaal ifzala ifzlaa
ifzlaa ifazal ifazla ifaazl ifaalz ifalaz ifalza iflzaa iflzaa iflaza iflaaz
iflaaz iflaza izfaal izfala izfaal izfala izflaa izflaa izafal izafla izaafl
izaalf izalaf izalfa izaafl izaalf izafal izafla izalfa izalaf izlaaf izlafa
izlaaf izlafa izlfaa izlfaa iafzal iafzla iafazl iafalz iaflaz iaflza iazfal
iazfla iazafl iazalf iazlaf iazlfa iaazfl iaazlf iaafzl iaaflz iaalfz iaalzf
ialzaf ialzfa ialazf ialafz ialfaz ialfza ilfzaa ilfzaa ilfaza ilfaaz ilfaaz
ilfaza ilzfaa ilzfaa ilzafa ilzaaf ilzaaf ilzafa ilazfa ilazaf ilafza ilafaz
ilaafz ilaazf ilazaf ilazfa ilaazf ilaafz ilafaz ilafza zaifal zaifla zaiafl
zaialf zailaf zailfa zafial zafila zafail zafali zaflai zaflia zaafil zaafli
zaaifl zaailf zaalif zaalfi zalfai zalfia zalafi zalaif zaliaf zalifa ziafal
ziafla ziaafl ziaalf zialaf zialfa zifaal zifala zifaal zifala ziflaa ziflaa
ziafal ziafla ziaafl ziaalf zialaf zialfa zilfaa zilfaa zilafa zilaaf zilaaf
zilafa zfiaal zfiala zfiaal zfiala zfilaa zfilaa zfaial zfaila zfaail zfaali
zfalai zfalia zfaail zfaali zfaial zfaila zfalia zfalai zflaai zflaia zflaai
zflaia zfliaa zfliaa zaifal zaifla zaiafl zaialf zailaf zailfa zafial zafila
zafail zafali zaflai zaflia zaafil zaafli zaaifl zaailf zaalif zaalfi zalfai
zalfia zalafi zalaif zaliaf zalifa zlifaa zlifaa zliafa zliaaf zliaaf zliafa
zlfiaa zlfiaa zlfaia zlfaai zlfaai zlfaia zlafia zlafai zlaifa zlaiaf zlaaif
zlaafi zlafai zlafia zlaafi zlaaif zlaiaf zlaifa aaizfl aaizlf aaifzl aaiflz
aailfz aailzf aazifl aazilf aazfil aazfli aazlfi aazlif aafzil aafzli aafizl
aafilz aafliz aaflzi aalzfi aalzif aalfzi aalfiz aalifz aalizf aiazfl aiazlf
aiafzl aiaflz aialfz aialzf aizafl aizalf aizfal aizfla aizlfa aizlaf aifzal
aifzla aifazl aifalz aiflaz aiflza ailzfa ailzaf ailfza ailfaz ailafz ailazf
aziafl azialf azifal azifla azilfa azilaf azaifl azailf azafil azafli azalfi
azalif azfail azfali azfial azfila azflia azflai azlafi azlaif azlfai azlfia
azlifa azliaf afizal afizla afiazl afialz afilaz afilza afzial afzila afzail
afzali afzlai afzlia afazil afazli afaizl afailz afaliz afalzi aflzai aflzia
aflazi aflaiz afliaz afliza alizfa alizaf alifza alifaz aliafz aliazf alzifa
alziaf alzfia alzfai alzafi alzaif alfzia alfzai alfiza alfiaz alfaiz alfazi
alazfi alazif alafzi alafiz alaifz alaizf laizaf laizfa laiazf laiafz laifaz
laifza laziaf lazifa lazaif lazafi lazfai lazfia laazif laazfi laaizf laaifz
laafiz laafzi lafzai lafzia lafazi lafaiz lafiaz lafiza liazaf liazfa liaazf
liaafz liafaz liafza lizaaf lizafa lizaaf lizafa lizfaa lizfaa liazaf liazfa
liaazf liaafz liafaz liafza lifzaa lifzaa lifaza lifaaz lifaaz lifaza lziaaf
lziafa lziaaf lziafa lzifaa lzifaa lzaiaf lzaifa lzaaif lzaafi lzafai lzafia
lzaaif lzaafi lzaiaf lzaifa lzafia lzafai lzfaai lzfaia lzfaai lzfaia lzfiaa
lzfiaa laizaf laizfa laiazf laiafz laifaz laifza laziaf lazifa lazaif lazafi
lazfai lazfia laazif laazfi laaizf laaifz laafiz laafzi lafzai lafzia lafazi
lafaiz lafiaz lafiza lfizaa lfizaa lfiaza lfiaaz lfiaaz lfiaza lfziaa lfziaa
lfzaia lfzaai lfzaai lfzaia lfazia lfazai lfaiza lfaiaz lfaaiz lfaazi lfazai
lfazia lfaazi lfaaiz lfaiaz lfaiza

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

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