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bibacillatum

underbeak

supponuntque

siames

lineolate

overarouses

noscoque

slusher

preadapting

metallification

shafty

leonines

jareb

certabunturque

thomistic

anoestrus

noosers

swearingen


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: djmac
cipher variations:
eknbd floce gmpdf hnqeg iorfh
jpsgi kqthj lruik msvjl ntwkm
ouxln pvymo qwznp rxaoq sybpr
tzcqs uadrt vbesu wcftv xdguw
yehvx zfiwy agjxz bhkya cilzb

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.)
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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: djmac
Cipher: wqnzx

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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: djmac
Cipher: AAABB BBBAA ABABB AAAAA AAABA

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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: djmac
cipher variations:
eknbdkclbhqujblwmhbpcefbtiwdbxugzbfayxbj
gqvbnmitbrsarbvyspbzfloceldmcirvkcmxnicq
dfgcujxecyvhacgbzyckhrwconjucstbscwztqca
gmpdfmendjswldnyojdreghdvkyfdzwibdhcazdl
isxdpokvdtuctdxaurdbhnqegnfoektxmeozpkes
fhiewlzgeaxjceidbaemjtyeqplweuvdueybvsec
iorfhogpfluynfpaqlftgijfxmahfbykdfjecbfn
kuzfrqmxfvwevfzcwtfdjpsgiphqgmvzogqbrmgu
hjkgynbigczlegkfdcgolvagsrnygwxfwgadxuge
kqthjqirhnwaphrcsnhviklhzocjhdamfhlgedhp
mwbhtsozhxygxhbeyvhflruikrjsioxbqisdtoiw
jlmiapdkiebngimhfeiqnxciutpaiyzhyicfzwig
msvjlsktjpycrjteupjxkmnjbqeljfcohjnigfjr
oydjvuqbjzaizjdgaxjhntwkmtlukqzdskufvqky
lnokcrfmkgdpikojhgkspzekwvrckabjakehbyki
ouxlnumvlraetlvgwrlzmopldsgnlheqjlpkihlt
qaflxwsdlbckblficzljpvymovnwmsbfumwhxsma
npqmethomifrkmqljimurbgmyxtemcdlcmgjdamk
qwznpwoxntcgvnxiytnboqrnfuipnjgslnrmkjnv
schnzyufndemdnhkebnlrxaoqxpyoudhwoyjzuoc
prsogvjqokhtmosnlkowtdioazvgoefneoilfcom
sybpryqzpveixpzkavpdqstphwkrpliunptomlpx
uejpbawhpfgofpjmgdpntzcqszraqwfjyqalbwqe
rtuqixlsqmjvoqupnmqyvfkqcbxiqghpgqknheqo
uadrtasbrxgkzrbmcxrfsuvrjymtrnkwprvqonrz
wglrdcyjrhiqhrloifrpvbesubtcsyhlascndysg
tvwskznusolxqswrposaxhmsedzksijrismpjgsq
wcftvcudtzimbtdoezthuwxtlaovtpmyrtxsqptb
yintfealtjksjtnqkhtrxdguwdveuajncuepfaui
vxyumbpwuqnzsuytrquczjougfbmukltkuorlius
yehvxewfvbkodvfqgbvjwyzvncqxvroatvzusrvd
akpvhgcnvlmulvpsmjvtzfiwyfxgwclpewgrhcwk
xzawodrywspbuwavtsweblqwihdowmnvmwqtnkwu
agjxzgyhxdmqfxhsidxlyabxpeszxtqcvxbwutxf
cmrxjiepxnownxruolxvbhkyahziyenrgyitjeym
zbcyqftayurdwycxvuygdnsykjfqyopxoysvpmyw
cilzbiajzfoshzjukfznacdzrgubzvsexzdywvzh
eotzlkgrzpqypztwqnzxdjmacjbkagptiakvlgao
bdeashvcawtfyaezxwaifpuamlhsaqrzqauxroay

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,

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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: djmac
Cipher: qwznp

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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: djmac
Cipher: 4142231131

Extended Methods:
Method #1

Plaintext: djmac
method variations:
iorfhotwlntybqsydgvx

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
d j m a c 
4 4 2 1 3 
1 2 3 1 1 
They are then read out in rows:
4421312311
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: djmac
Cipher: tbcma

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Method #3

Plaintext: djmac
method variations:
qgclq gclqq clqqg
lqqgc qqgcl

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: djmac

all 120 cipher variations:
djmac djmca djamc djacm djcam djcma dmjac dmjca dmajc dmacj dmcaj
dmcja damjc damcj dajmc dajcm dacjm dacmj dcmaj dcmja dcamj dcajm
dcjam dcjma jdmac jdmca jdamc jdacm jdcam jdcma jmdac jmdca jmadc
jmacd jmcad jmcda jamdc jamcd jadmc jadcm jacdm jacmd jcmad jcmda
jcamd jcadm jcdam jcdma mjdac mjdca mjadc mjacd mjcad mjcda mdjac
mdjca mdajc mdacj mdcaj mdcja madjc madcj majdc majcd macjd macdj
mcdaj mcdja mcadj mcajd mcjad mcjda ajmdc ajmcd ajdmc ajdcm ajcdm
ajcmd amjdc amjcd amdjc amdcj amcdj amcjd admjc admcj adjmc adjcm
adcjm adcmj acmdj acmjd acdmj acdjm acjdm acjmd cjmad cjmda cjamd
cjadm cjdam cjdma cmjad cmjda cmajd cmadj cmdaj cmdja camjd camdj
cajmd cajdm cadjm cadmj cdmaj cdmja cdamj cdajm cdjam cdjma

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

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