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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: unissu
cipher variations:
vojttv wpkuuw xqlvvx yrmwwy zsnxxz
atoyya bupzzb cvqaac dwrbbd exscce
fytddf gzueeg havffh ibwggi jcxhhj
kdyiik lezjjl mfakkm ngblln ohcmmo
pidnnp qjeooq rkfppr slgqqs tmhrrt

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: unissu
Cipher: fmrhhf

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: unissu
Cipher: BAABB ABBAA ABAAA BAAAB BAAAB BAABB

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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: unissu
cipher variations:
vojttvjozddjxopnnxlofxxlzovhhznolrrnporllpdohvvd
roxffrfonppftodzzthotjjhwpkuuwkpaeekypqooympgyym
apwiiaopmssoqpsmmqepiwwespyggsgpoqqgupeaauipukki
xqlvvxlqbfflzqrppznqhzznbqxjjbpqnttprqtnnrfqjxxf
tqzhhthqprrhvqfbbvjqvlljyrmwwymrcggmarsqqaoriaao
crykkcqrouuqsruoosgrkyyguraiiuirqssiwrgccwkrwmmk
zsnxxznsdhhnbstrrbpsjbbpdszlldrspvvrtsvppthslzzh
vsbjjvjsrttjxshddxlsxnnlatoyyaoteiioctusscqtkccq
etammestqwwsutwqquitmaaiwtckkwktsuukytieeymtyoom
bupzzbpufjjpduvttdrulddrfubnnfturxxtvuxrrvjunbbj
xudllxlutvvlzujffznuzppncvqaacqvgkkqevwuuesvmees
gvcooguvsyyuwvysswkvocckyvemmymvuwwmavkggaovaqqo
dwrbbdrwhllrfwxvvftwnffthwdpphvwtzzvxwzttxlwpddl
zwfnnznwvxxnbwlhhbpwbrrpexsccesximmsgxywwguxoggu
ixeqqiwxuaawyxauuymxqeemaxgooaoxwyyocxmiicqxcssq
fytddftyjnnthyzxxhvyphhvjyfrrjxyvbbxzybvvznyrffn
byhppbpyxzzpdynjjdrydttrgzueeguzkoouizayyiwzqiiw
kzgsskyzwccyazcwwaozsggocziqqcqzyaaqezokkeszeuus
havffhvalppvjabzzjxarjjxlahttlzaxddzbadxxbpathhp
dajrrdrazbbrfapllftafvvtibwggiwbmqqwkbcaakybskky
mbiuumabyeeacbeyycqbuiiqebkssesbaccsgbqmmgubgwwu
jcxhhjxcnrrxlcdbblzctllzncjvvnbczffbdcfzzdrcvjjr
fclttftcbddthcrnnhvchxxvkdyiikydossymdeccmadumma
odkwwocdaggcedgaaesdwkksgdmuugudceeuidsooiwdiyyw
lezjjlzepttznefddnbevnnbpelxxpdebhhdfehbbftexllt
henvvhvedffvjetppjxejzzxmfakkmafquuaofgeeocfwooc
qfmyyqefciiegficcgufymmuifowwiwfeggwkfuqqkyfkaay
ngbllnbgrvvbpghffpdgxppdrgnzzrfgdjjfhgjddhvgznnv
jgpxxjxgfhhxlgvrrlzglbbzohcmmochswwcqhiggqehyqqe
shoaasghekkgihkeeiwhaoowkhqyykyhgiiymhwssmahmcca
pidnnpditxxdrijhhrfizrrftipbbthifllhjilffjxibppx
lirzzlzihjjznixttnbinddbqjeooqejuyyesjkiisgjassg
ujqccuijgmmikjmggkyjcqqymjsaamajikkaojyuuocjoeec
rkfpprfkvzzftkljjthkbtthvkrddvjkhnnjlknhhlzkdrrz
nktbbnbkjllbpkzvvpdkpffdslgqqsglwaagulmkkuilcuui
wlseewkliookmloiimalessaoluccoclkmmcqlawwqelqgge
tmhrrthmxbbhvmnllvjmdvvjxmtffxlmjpplnmpjjnbmfttb
pmvddpdmlnndrmbxxrfmrhhfunissuinycciwnommwknewwk
ynuggymnkqqmonqkkocnguucqnweeqenmooesncyysgnsiig

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: unissu
Cipher: havffh

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: unissu
Cipher: 543342343454

Extended Methods:
Method #1

Plaintext: unissu
method variations:
zsoxxzextccekcyhhkphdnnp

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
u n i s s u 
5 3 4 3 3 5 
4 3 2 4 4 4 
They are then read out in rows:
534335432444
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: unissu
Cipher: poxort

Read more ...
Method #3

Plaintext: unissu
method variations:
osmoyy smoyyo moyyos
oyyosm yyosmo yosmoy

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: unissu

all 720 cipher variations:
unissu unisus unissu unisus uniuss uniuss unsisu unsius unssiu unssui unsusi
unsuis unssiu unssui unsisu unsius unsuis unsusi unussi unusis unussi unusis
unuiss unuiss uinssu uinsus uinssu uinsus uinuss uinuss uisnsu uisnus uissnu
uissun uisusn uisuns uissnu uissun uisnsu uisnus uisuns uisusn uiussn uiusns
uiussn uiusns uiunss uiunss usinsu usinus usisnu usisun usiusn usiuns usnisu
usnius usnsiu usnsui usnusi usnuis ussniu ussnui ussinu ussiun ussuin ussuni
usunsi usunis ususni ususin usuisn usuins usisnu usisun usinsu usinus usiuns
usiusn ussinu ussiun ussniu ussnui ussuni ussuin usnsiu usnsui usnisu usnius
usnuis usnusi ususni ususin usunsi usunis usuins usuisn uuissn uuisns uuissn
uuisns uuinss uuinss uusisn uusins uussin uussni uusnsi uusnis uussin uussni
uusisn uusins uusnis uusnsi uunssi uunsis uunssi uunsis uuniss uuniss nuissu
nuisus nuissu nuisus nuiuss nuiuss nusisu nusius nussiu nussui nususi nusuis
nussiu nussui nusisu nusius nusuis nususi nuussi nuusis nuussi nuusis nuuiss
nuuiss niussu niusus niussu niusus niuuss niuuss nisusu nisuus nissuu nissuu
nisusu nisuus nissuu nissuu nisusu nisuus nisuus nisusu niussu niusus niussu
niusus niuuss niuuss nsiusu nsiuus nsisuu nsisuu nsiusu nsiuus nsuisu nsuius
nsusiu nsusui nsuusi nsuuis nssuiu nssuui nssiuu nssiuu nssuiu nssuui nsuusi
nsuuis nsusui nsusiu nsuisu nsuius nsisuu nsisuu nsiusu nsiuus nsiuus nsiusu
nssiuu nssiuu nssuiu nssuui nssuui nssuiu nsusiu nsusui nsuisu nsuius nsuuis
nsuusi nsusui nsusiu nsuusi nsuuis nsuius nsuisu nuissu nuisus nuissu nuisus
nuiuss nuiuss nusisu nusius nussiu nussui nususi nusuis nussiu nussui nusisu
nusius nusuis nususi nuussi nuusis nuussi nuusis nuuiss nuuiss inussu inusus
inussu inusus inuuss inuuss insusu insuus inssuu inssuu insusu insuus inssuu
inssuu insusu insuus insuus insusu inussu inusus inussu inusus inuuss inuuss
iunssu iunsus iunssu iunsus iunuss iunuss iusnsu iusnus iussnu iussun iususn
iusuns iussnu iussun iusnsu iusnus iusuns iususn iuussn iuusns iuussn iuusns
iuunss iuunss isunsu isunus isusnu isusun isuusn isuuns isnusu isnuus isnsuu
isnsuu isnusu isnuus issnuu issnuu issunu issuun issuun issunu isunsu isunus
isusnu isusun isuusn isuuns isusnu isusun isunsu isunus isuuns isuusn issunu
issuun issnuu issnuu issunu issuun isnsuu isnsuu isnusu isnuus isnuus isnusu
isusnu isusun isunsu isunus isuuns isuusn iuussn iuusns iuussn iuusns iuunss
iuunss iususn iusuns iussun iussnu iusnsu iusnus iussun iussnu iususn iusuns
iusnus iusnsu iunssu iunsus iunssu iunsus iunuss iunuss sniusu sniuus snisuu
snisuu sniusu sniuus snuisu snuius snusiu snusui snuusi snuuis snsuiu snsuui
snsiuu snsiuu snsuiu snsuui snuusi snuuis snusui snusiu snuisu snuius sinusu
sinuus sinsuu sinsuu sinusu sinuus siunsu siunus siusnu siusun siuusn siuuns
sisunu sisuun sisnuu sisnuu sisunu sisuun siuusn siuuns siusun siusnu siunsu
siunus suinsu suinus suisnu suisun suiusn suiuns sunisu sunius sunsiu sunsui
sunusi sunuis susniu susnui susinu susiun susuin susuni suunsi suunis suusni
suusin suuisn suuins ssiunu ssiuun ssinuu ssinuu ssiunu ssiuun ssuinu ssuiun
ssuniu ssunui ssuuni ssuuin ssnuiu ssnuui ssniuu ssniuu ssnuiu ssnuui ssuuni
ssuuin ssunui ssuniu ssuinu ssuiun suiusn suiuns suisun suisnu suinsu suinus
suuisn suuins suusin suusni suunsi suunis susuin susuni susiun susinu susniu
susnui sunusi sunuis sunsui sunsiu sunisu sunius snisuu snisuu sniusu sniuus
sniuus sniusu snsiuu snsiuu snsuiu snsuui snsuui snsuiu snusiu snusui snuisu
snuius snuuis snuusi snusui snusiu snuusi snuuis snuius snuisu sinsuu sinsuu
sinusu sinuus sinuus sinusu sisnuu sisnuu sisunu sisuun sisuun sisunu siusnu
siusun siunsu siunus siuuns siuusn siusun siusnu siuusn siuuns siunus siunsu
ssinuu ssinuu ssiunu ssiuun ssiuun ssiunu ssniuu ssniuu ssnuiu ssnuui ssnuui
ssnuiu ssuniu ssunui ssuinu ssuiun ssuuin ssuuni ssunui ssuniu ssuuni ssuuin
ssuiun ssuinu suisnu suisun suinsu suinus suiuns suiusn susinu susiun susniu
susnui susuni susuin sunsiu sunsui sunisu sunius sunuis sunusi suusni suusin
suunsi suunis suuins suuisn suisun suisnu suiusn suiuns suinus suinsu susiun
susinu susuin susuni susnui susniu suusin suusni suuisn suuins suunis suunsi
sunsui sunsiu sunusi sunuis sunius sunisu unissu unisus unissu unisus uniuss
uniuss unsisu unsius unssiu unssui unsusi unsuis unssiu unssui unsisu unsius
unsuis unsusi unussi unusis unussi unusis unuiss unuiss uinssu uinsus uinssu
uinsus uinuss uinuss uisnsu uisnus uissnu uissun uisusn uisuns uissnu uissun
uisnsu uisnus uisuns uisusn uiussn uiusns uiussn uiusns uiunss uiunss usinsu
usinus usisnu usisun usiusn usiuns usnisu usnius usnsiu usnsui usnusi usnuis
ussniu ussnui ussinu ussiun ussuin ussuni usunsi usunis ususni ususin usuisn
usuins usisnu usisun usinsu usinus usiuns usiusn ussinu ussiun ussniu ussnui
ussuni ussuin usnsiu usnsui usnisu usnius usnuis usnusi ususni ususin usunsi
usunis usuins usuisn uuissn uuisns uuissn uuisns uuinss uuinss uusisn uusins
uussin uussni uusnsi uusnis uussin uussni uusisn uusins uusnis uusnsi uunssi
uunsis uunssi uunsis uuniss uuniss

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

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