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suldan

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indee

carryover

dicavisti

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tetradecyl


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: fibber
cipher variations:
gjccfs hkddgt ileehu jmffiv knggjw
lohhkx mpiily nqjjmz orkkna psllob
qtmmpc runnqd svoore twppsf uxqqtg
vyrruh wzssvi xattwj ybuuxk zcvvyl
adwwzm bexxan cfyybo dgzzcp ehaadq

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: fibber
Cipher: uryyvi

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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: fibber
Cipher: AABAB ABAAA AAAAB AAAAB AABAA BAAAA

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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: fibber
cipher variations:
gjccfsqzeenaapggvikfiidquvkklyelmmtgyrqqjwihssre
sxuuzmcnwwhumdyypcwtaaxkhkddgtraffobbqhhwjlgjjer
vwllmzfmnnuhzsrrkxjittsftyvvandoxxivnezzqdxubbyl
ileehusbggpccriixkmhkkfswxmmnagnooviatsslykjuutg
uzwwboepyyjwofaareyvcczmjmffivtchhqddsjjylnillgt
xynnobhoppwjbuttmzlkvvuhvaxxcpfqzzkxpgbbsfzwddan
knggjwudiireetkkzmojmmhuyzoopcipqqxkcvuunamlwwvi
wbyydqgraalyqhcctgaxeebolohhkxvejjsffullanpknniv
zappqdjqrryldwvvobnmxxwjxczzerhsbbmzridduhbyffcp
mpiilywfkktggvmmboqloojwabqqrekrsszmexwwpconyyxk
ydaafsitccnasjeeviczggdqnqjjmzxglluhhwnncprmppkx
bcrrsflsttanfyxxqdpozzylzebbgtjuddobtkffwjdahher
orkknayhmmviixoodqsnqqlycdsstgmtuubogzyyreqpaazm
afcchukveepculggxkebiifspsllobzinnwjjyppertorrmz
dettuhnuvvcphazzsfrqbbanbgddivlwffqdvmhhylfcjjgt
qtmmpcajooxkkzqqfsupssnaefuuviovwwdqibaatgsrccbo
cheejwmxggrewniizmgdkkhurunnqdbkppyllarrgtvqttob
fgvvwjpwxxerjcbbuhtsddcpdiffkxnyhhsfxojjanhelliv
svooreclqqzmmbsshuwruupcghwwxkqxyyfskdccviuteedq
ejgglyoziitgypkkboifmmjwtwppsfdmrranncttivxsvvqd
hixxylryzzgtleddwjvufferfkhhmzpajjuhzqllcpjgnnkx
uxqqtgenssbooduujwytwwreijyyzmszaahumfeexkwvggfs
gliinaqbkkviarmmdqkhoolyvyrruhfottcppevvkxzuxxsf
jkzzantabbivngffylxwhhgthmjjobrcllwjbsnnerlippmz
wzssvigpuudqqfwwlyavyytgklaaboubccjwohggzmyxiihu
inkkpcsdmmxkctoofsmjqqnaxattwjhqvverrgxxmzbwzzuh
lmbbcpvcddkxpihhanzyjjivjollqdtennylduppgtnkrrob
ybuuxkirwwfsshyynacxaavimnccdqwdeelyqjiiboazkkjw
kpmmreufoozmevqqhuolsspczcvvyljsxxgttizzobdybbwj
nodderxeffmzrkjjcpballkxlqnnsfvgppanfwrrivpmttqd
adwwzmktyyhuujaapcezccxkopeefsyfggnaslkkdqcbmmly
mrootgwhqqbogxssjwqnuurebexxanluzzivvkbbqdfaddyl
pqffgtzghhobtmllerdcnnmznsppuhxirrcphyttkxrovvsf
cfyybomvaajwwlccregbeezmqrgghuahiipcunmmfsedoona
otqqviyjssdqizuulyspwwtgdgzzcpnwbbkxxmddsfhcffan
rshhivbijjqdvonngtfeppobpurrwjzktterjavvmztqxxuh
ehaadqoxcclyyneetgidggbostiijwcjkkrewpoohugfqqpc
qvssxkaluufskbwwnauryyvifibberpyddmzzoffuhjehhcp
tujjkxdkllsfxqppivhgrrqdrwttylbmvvgtlcxxobvszzwj

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: fibber
Cipher: svoore

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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: fibber
Cipher: 124221215124

Extended Methods:
Method #1

Plaintext: fibber
method variations:
loggkwqtmmpbvyrrugadwwzm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
f i b b e r 
1 4 2 2 5 2 
2 2 1 1 1 4 
They are then read out in rows:
142252221114
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: fibber
Cipher: qgkgaq

Read more ...
Method #3

Plaintext: fibber
method variations:
rgfvfd gfvfdr fvfdrg
vfdrgf fdrgfv drgfvf

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: fibber

all 720 cipher variations:
fibber fibbre fibebr fiberb fibreb fibrbe fibber fibbre fibebr fiberb fibreb
fibrbe fiebbr fiebrb fiebbr fiebrb fierbb fierbb firbeb firbbe firebb firebb
firbeb firbbe fbiber fbibre fbiebr fbierb fbireb fbirbe fbbier fbbire fbbeir
fbberi fbbrei fbbrie fbebir fbebri fbeibr fbeirb fberib fberbi fbrbei fbrbie
fbrebi fbreib fbrieb fbribe fbbier fbbire fbbeir fbberi fbbrei fbbrie fbiber
fbibre fbiebr fbierb fbireb fbirbe fbeibr fbeirb fbebir fbebri fberbi fberib
fbrieb fbribe fbreib fbrebi fbrbei fbrbie febbir febbri febibr febirb febrib
febrbi febbir febbri febibr febirb febrib febrbi feibbr feibrb feibbr feibrb
feirbb feirbb ferbib ferbbi feribb feribb ferbib ferbbi frbbei frbbie frbebi
frbeib frbieb frbibe frbbei frbbie frbebi frbeib frbieb frbibe frebbi frebib
frebbi frebib freibb freibb fribeb fribbe friebb friebb fribeb fribbe ifbber
ifbbre ifbebr ifberb ifbreb ifbrbe ifbber ifbbre ifbebr ifberb ifbreb ifbrbe
ifebbr ifebrb ifebbr ifebrb iferbb iferbb ifrbeb ifrbbe ifrebb ifrebb ifrbeb
ifrbbe ibfber ibfbre ibfebr ibferb ibfreb ibfrbe ibbfer ibbfre ibbefr ibberf
ibbref ibbrfe ibebfr ibebrf ibefbr ibefrb iberfb iberbf ibrbef ibrbfe ibrebf
ibrefb ibrfeb ibrfbe ibbfer ibbfre ibbefr ibberf ibbref ibbrfe ibfber ibfbre
ibfebr ibferb ibfreb ibfrbe ibefbr ibefrb ibebfr ibebrf iberbf iberfb ibrfeb
ibrfbe ibrefb ibrebf ibrbef ibrbfe iebbfr iebbrf iebfbr iebfrb iebrfb iebrbf
iebbfr iebbrf iebfbr iebfrb iebrfb iebrbf iefbbr iefbrb iefbbr iefbrb iefrbb
iefrbb ierbfb ierbbf ierfbb ierfbb ierbfb ierbbf irbbef irbbfe irbebf irbefb
irbfeb irbfbe irbbef irbbfe irbebf irbefb irbfeb irbfbe irebbf irebfb irebbf
irebfb irefbb irefbb irfbeb irfbbe irfebb irfebb irfbeb irfbbe bifber bifbre
bifebr biferb bifreb bifrbe bibfer bibfre bibefr biberf bibref bibrfe biebfr
biebrf biefbr biefrb bierfb bierbf birbef birbfe birebf birefb birfeb birfbe
bfiber bfibre bfiebr bfierb bfireb bfirbe bfbier bfbire bfbeir bfberi bfbrei
bfbrie bfebir bfebri bfeibr bfeirb bferib bferbi bfrbei bfrbie bfrebi bfreib
bfrieb bfribe bbfier bbfire bbfeir bbferi bbfrei bbfrie bbifer bbifre bbiefr
bbierf bbiref bbirfe bbeifr bbeirf bbefir bbefri bberfi bberif bbrief bbrife
bbreif bbrefi bbrfei bbrfie befbir befbri befibr befirb befrib befrbi bebfir
bebfri bebifr bebirf bebrif bebrfi beibfr beibrf beifbr beifrb beirfb beirbf
berbif berbfi beribf berifb berfib berfbi brfbei brfbie brfebi brfeib brfieb
brfibe brbfei brbfie brbefi brbeif brbief brbife brebfi brebif brefbi brefib
breifb breibf bribef bribfe briebf briefb brifeb brifbe bibfer bibfre bibefr
biberf bibref bibrfe bifber bifbre bifebr biferb bifreb bifrbe biefbr biefrb
biebfr biebrf bierbf bierfb birfeb birfbe birefb birebf birbef birbfe bbifer
bbifre bbiefr bbierf bbiref bbirfe bbfier bbfire bbfeir bbferi bbfrei bbfrie
bbefir bbefri bbeifr bbeirf bberif bberfi bbrfei bbrfie bbrefi bbreif bbrief
bbrife bfbier bfbire bfbeir bfberi bfbrei bfbrie bfiber bfibre bfiebr bfierb
bfireb bfirbe bfeibr bfeirb bfebir bfebri bferbi bferib bfrieb bfribe bfreib
bfrebi bfrbei bfrbie bebfir bebfri bebifr bebirf bebrif bebrfi befbir befbri
befibr befirb befrib befrbi beifbr beifrb beibfr beibrf beirbf beirfb berfib
berfbi berifb beribf berbif berbfi brbfei brbfie brbefi brbeif brbief brbife
brfbei brfbie brfebi brfeib brfieb brfibe brefbi brefib brebfi brebif breibf
breifb brifeb brifbe briefb briebf bribef bribfe eibbfr eibbrf eibfbr eibfrb
eibrfb eibrbf eibbfr eibbrf eibfbr eibfrb eibrfb eibrbf eifbbr eifbrb eifbbr
eifbrb eifrbb eifrbb eirbfb eirbbf eirfbb eirfbb eirbfb eirbbf ebibfr ebibrf
ebifbr ebifrb ebirfb ebirbf ebbifr ebbirf ebbfir ebbfri ebbrfi ebbrif ebfbir
ebfbri ebfibr ebfirb ebfrib ebfrbi ebrbfi ebrbif ebrfbi ebrfib ebrifb ebribf
ebbifr ebbirf ebbfir ebbfri ebbrfi ebbrif ebibfr ebibrf ebifbr ebifrb ebirfb
ebirbf ebfibr ebfirb ebfbir ebfbri ebfrbi ebfrib ebrifb ebribf ebrfib ebrfbi
ebrbfi ebrbif efbbir efbbri efbibr efbirb efbrib efbrbi efbbir efbbri efbibr
efbirb efbrib efbrbi efibbr efibrb efibbr efibrb efirbb efirbb efrbib efrbbi
efribb efribb efrbib efrbbi erbbfi erbbif erbfbi erbfib erbifb erbibf erbbfi
erbbif erbfbi erbfib erbifb erbibf erfbbi erfbib erfbbi erfbib erfibb erfibb
eribfb eribbf erifbb erifbb eribfb eribbf ribbef ribbfe ribebf ribefb ribfeb
ribfbe ribbef ribbfe ribebf ribefb ribfeb ribfbe riebbf riebfb riebbf riebfb
riefbb riefbb rifbeb rifbbe rifebb rifebb rifbeb rifbbe rbibef rbibfe rbiebf
rbiefb rbifeb rbifbe rbbief rbbife rbbeif rbbefi rbbfei rbbfie rbebif rbebfi
rbeibf rbeifb rbefib rbefbi rbfbei rbfbie rbfebi rbfeib rbfieb rbfibe rbbief
rbbife rbbeif rbbefi rbbfei rbbfie rbibef rbibfe rbiebf rbiefb rbifeb rbifbe
rbeibf rbeifb rbebif rbebfi rbefbi rbefib rbfieb rbfibe rbfeib rbfebi rbfbei
rbfbie rebbif rebbfi rebibf rebifb rebfib rebfbi rebbif rebbfi rebibf rebifb
rebfib rebfbi reibbf reibfb reibbf reibfb reifbb reifbb refbib refbbi refibb
refibb refbib refbbi rfbbei rfbbie rfbebi rfbeib rfbieb rfbibe rfbbei rfbbie
rfbebi rfbeib rfbieb rfbibe rfebbi rfebib rfebbi rfebib rfeibb rfeibb rfibeb
rfibbe rfiebb rfiebb rfibeb rfibbe

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

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