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specified


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: amylan
cipher variations:
bnzmbo coancp dpbodq eqcper frdqfs
gsergt htfshu iugtiv jvhujw kwivkx
lxjwly mykxmz nzlyna oamzob pbnapc
qcobqd rdpcre seqdsf tfretg ugsfuh
vhtgvi wiuhwj xjvixk ykwjyl zlxkzm

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: amylan
Cipher: znbozm

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: amylan
Cipher: AAAAA ABABB BABBA ABABA AAAAA ABBAA

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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: amylan
cipher variations:
bnzmboblvibobjrebobhnabobfjwbobdfsbobzxkbobxtgbo
bvpcbobtlybobrhubobpdqbocoancpcmwjcpcksfcpciobcp
cgkxcpcegtcpcaylcpcyuhcpcwqdcpcumzcpcsivcpcqercp
dpbodqdnxkdqdltgdqdjpcdqdhlydqdfhudqdbzmdqdzvidq
dxredqdvnadqdtjwdqdrfsdqeqcpereoyleremuherekqder
eimzeregiverecanereawjereysferewobereukxeresgter
frdqfsfpzmfsfnvifsflrefsfjnafsfhjwfsfdbofsfbxkfs
fztgfsfxpcfsfvlyfsfthufsgsergtgqangtgowjgtgmsfgt
gkobgtgikxgtgecpgtgcylgtgauhgtgyqdgtgwmzgtguivgt
htfshuhrbohuhpxkhuhntghuhlpchuhjlyhuhfdqhuhdzmhu
hbvihuhzrehuhxnahuhvjwhuiugtiviscpiviqyliviouhiv
imqdivikmzivigerivieanivicwjiviasfiviyobiviwkxiv
jvhujwjtdqjwjrzmjwjpvijwjnrejwjlnajwjhfsjwjfbojw
jdxkjwjbtgjwjzpcjwjxlyjwkwivkxkuerkxksankxkqwjkx
kosfkxkmobkxkigtkxkgcpkxkeylkxkcuhkxkaqdkxkymzkx
lxjwlylvfslyltbolylrxklylptglylnpclyljhulylhdqly
lfzmlyldvilylbrelylznalymykxmzmwgtmzmucpmzmsylmz
mquhmzmoqdmzmkivmzmiermzmganmzmewjmzmcsfmzmaobmz
nzlynanxhunanvdqnantzmnanrvinanprenanljwnanjfsna
nhbonanfxknandtgnanbpcnaoamzoboyivobowerobouanob
oswjoboqsfobomkxobokgtoboicpobogyloboeuhobocqdob
pbnapcpzjwpcpxfspcpvbopcptxkpcprtgpcpnlypcplhupc
pjdqpcphzmpcpfvipcpdrepcqcobqdqakxqdqygtqdqwcpqd
quylqdqsuhqdqomzqdqmivqdqkerqdqianqdqgwjqdqesfqd
rdpcrerblyrerzhurerxdqrervzmrertvirerpnarernjwre
rlfsrerjborerhxkrerftgreseqdsfscmzsfsaivsfsyersf
swansfsuwjsfsqobsfsokxsfsmgtsfskcpsfsiylsfsguhsf
tfretgtdnatgtbjwtgtzfstgtxbotgtvxktgtrpctgtplytg
tnhutgtldqtgtjzmtgthvitgugsfuhueobuhuckxuhuagtuh
uycpuhuwyluhusqduhuqmzuhuoivuhumeruhukanuhuiwjuh
vhtgvivfpcvivdlyvivbhuvivzdqvivxzmvivtrevivrnavi
vpjwvivnfsvivlbovivjxkviwiuhwjwgqdwjwemzwjwcivwj
waerwjwyanwjwusfwjwsobwjwqkxwjwogtwjwmcpwjwkylwj
xjvixkxhrexkxfnaxkxdjwxkxbfsxkxzboxkxvtgxkxtpcxk
xrlyxkxphuxkxndqxkxlzmxkykwjylyisfylygobylyekxyl
ycgtylyacpylywuhylyuqdylysmzylyqivylyoerylymanyl
zlxkzmzjtgzmzhpczmzflyzmzdhuzmzbdqzmzxvizmzvrezm
ztnazmzrjwzmzpfszmznbozmamylanakuhanaiqdanagmzan
aeivanaceranaywjanawsfanauobanaskxanaqgtanaocpan

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: amylan
Cipher: nzlyna

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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: amylan
Cipher: 112345131133

Extended Methods:
Method #1

Plaintext: amylan
method variations:
frdqfslwivlxqboaqcvgtfvh

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
a m y l a n 
1 2 4 1 1 3 
1 3 5 3 1 3 
They are then read out in rows:
124113135313
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: amylan
Cipher: fdllpl

Read more ...
Method #3

Plaintext: amylan
method variations:
fseclc seclcf eclcfs
clcfse lcfsec cfsecl

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: amylan

all 720 cipher variations:
amylan amylna amyaln amyanl amynal amynla amlyan amlyna amlayn amlany amlnay
amlnya amalyn amalny amayln amaynl amanyl amanly amnlay amnlya amnaly amnayl
amnyal amnyla aymlan aymlna aymaln aymanl aymnal aymnla aylman aylmna aylamn
aylanm aylnam aylnma ayalmn ayalnm ayamln ayamnl ayanml ayanlm aynlam aynlma
aynalm aynaml aynmal aynmla alyman alymna alyamn alyanm alynam alynma almyan
almyna almayn almany almnay almnya alamyn alamny alaymn alaynm alanym alanmy
alnmay alnmya alnamy alnaym alnyam alnyma aaylmn aaylnm aaymln aaymnl aaynml
aaynlm aalymn aalynm aalmyn aalmny aalnmy aalnym aamlyn aamlny aamyln aamynl
aamnyl aamnly aanlmy aanlym aanmly aanmyl aanyml aanylm anylam anylma anyalm
anyaml anymal anymla anlyam anlyma anlaym anlamy anlmay anlmya analym analmy
anaylm anayml anamyl anamly anmlay anmlya anmaly anmayl anmyal anmyla maylan
maylna mayaln mayanl maynal maynla malyan malyna malayn malany malnay malnya
maalyn maalny maayln maaynl maanyl maanly manlay manlya manaly manayl manyal
manyla myalan myalna myaaln myaanl myanal myanla mylaan mylana mylaan mylana
mylnaa mylnaa myalan myalna myaaln myaanl myanal myanla mynlaa mynlaa mynala
mynaal mynaal mynala mlyaan mlyana mlyaan mlyana mlynaa mlynaa mlayan mlayna
mlaayn mlaany mlanay mlanya mlaayn mlaany mlayan mlayna mlanya mlanay mlnaay
mlnaya mlnaay mlnaya mlnyaa mlnyaa maylan maylna mayaln mayanl maynal maynla
malyan malyna malayn malany malnay malnya maalyn maalny maayln maaynl maanyl
maanly manlay manlya manaly manayl manyal manyla mnylaa mnylaa mnyala mnyaal
mnyaal mnyala mnlyaa mnlyaa mnlaya mnlaay mnlaay mnlaya mnalya mnalay mnayla
mnayal mnaayl mnaaly mnalay mnalya mnaaly mnaayl mnayal mnayla ymalan ymalna
ymaaln ymaanl ymanal ymanla ymlaan ymlana ymlaan ymlana ymlnaa ymlnaa ymalan
ymalna ymaaln ymaanl ymanal ymanla ymnlaa ymnlaa ymnala ymnaal ymnaal ymnala
yamlan yamlna yamaln yamanl yamnal yamnla yalman yalmna yalamn yalanm yalnam
yalnma yaalmn yaalnm yaamln yaamnl yaanml yaanlm yanlam yanlma yanalm yanaml
yanmal yanmla ylaman ylamna ylaamn ylaanm ylanam ylanma ylmaan ylmana ylmaan
ylmana ylmnaa ylmnaa ylaman ylamna ylaamn ylaanm ylanam ylanma ylnmaa ylnmaa
ylnama ylnaam ylnaam ylnama yaalmn yaalnm yaamln yaamnl yaanml yaanlm yalamn
yalanm yalman yalmna yalnma yalnam yamlan yamlna yamaln yamanl yamnal yamnla
yanlma yanlam yanmla yanmal yanaml yanalm ynalam ynalma ynaalm ynaaml ynamal
ynamla ynlaam ynlama ynlaam ynlama ynlmaa ynlmaa ynalam ynalma ynaalm ynaaml
ynamal ynamla ynmlaa ynmlaa ynmala ynmaal ynmaal ynmala lmyaan lmyana lmyaan
lmyana lmynaa lmynaa lmayan lmayna lmaayn lmaany lmanay lmanya lmaayn lmaany
lmayan lmayna lmanya lmanay lmnaay lmnaya lmnaay lmnaya lmnyaa lmnyaa lymaan
lymana lymaan lymana lymnaa lymnaa lyaman lyamna lyaamn lyaanm lyanam lyanma
lyaamn lyaanm lyaman lyamna lyanma lyanam lynaam lynama lynaam lynama lynmaa
lynmaa layman laymna layamn layanm laynam laynma lamyan lamyna lamayn lamany
lamnay lamnya laamyn laamny laaymn laaynm laanym laanmy lanmay lanmya lanamy
lanaym lanyam lanyma layamn layanm layman laymna laynma laynam laaymn laaynm
laamyn laamny laanmy laanym lamayn lamany lamyan lamyna lamnya lamnay lanamy
lanaym lanmay lanmya lanyma lanyam lnyaam lnyama lnyaam lnyama lnymaa lnymaa
lnayam lnayma lnaaym lnaamy lnamay lnamya lnaaym lnaamy lnayam lnayma lnamya
lnamay lnmaay lnmaya lnmaay lnmaya lnmyaa lnmyaa amylan amylna amyaln amyanl
amynal amynla amlyan amlyna amlayn amlany amlnay amlnya amalyn amalny amayln
amaynl amanyl amanly amnlay amnlya amnaly amnayl amnyal amnyla aymlan aymlna
aymaln aymanl aymnal aymnla aylman aylmna aylamn aylanm aylnam aylnma ayalmn
ayalnm ayamln ayamnl ayanml ayanlm aynlam aynlma aynalm aynaml aynmal aynmla
alyman alymna alyamn alyanm alynam alynma almyan almyna almayn almany almnay
almnya alamyn alamny alaymn alaynm alanym alanmy alnmay alnmya alnamy alnaym
alnyam alnyma aaylmn aaylnm aaymln aaymnl aaynml aaynlm aalymn aalynm aalmyn
aalmny aalnmy aalnym aamlyn aamlny aamyln aamynl aamnyl aamnly aanlmy aanlym
aanmly aanmyl aanyml aanylm anylam anylma anyalm anyaml anymal anymla anlyam
anlyma anlaym anlamy anlmay anlmya analym analmy anaylm anayml anamyl anamly
anmlay anmlya anmaly anmayl anmyal anmyla nmylaa nmylaa nmyala nmyaal nmyaal
nmyala nmlyaa nmlyaa nmlaya nmlaay nmlaay nmlaya nmalya nmalay nmayla nmayal
nmaayl nmaaly nmalay nmalya nmaaly nmaayl nmayal nmayla nymlaa nymlaa nymala
nymaal nymaal nymala nylmaa nylmaa nylama nylaam nylaam nylama nyalma nyalam
nyamla nyamal nyaaml nyaalm nyalam nyalma nyaalm nyaaml nyamal nyamla nlymaa
nlymaa nlyama nlyaam nlyaam nlyama nlmyaa nlmyaa nlmaya nlmaay nlmaay nlmaya
nlamya nlamay nlayma nlayam nlaaym nlaamy nlamay nlamya nlaamy nlaaym nlayam
nlayma naylma naylam naymla naymal nayaml nayalm nalyma nalyam nalmya nalmay
nalamy nalaym namlya namlay namyla namyal namayl namaly naalmy naalym naamly
naamyl naayml naaylm naylam naylma nayalm nayaml naymal naymla nalyam nalyma
nalaym nalamy nalmay nalmya naalym naalmy naaylm naayml naamyl naamly namlay
namlya namaly namayl namyal namyla

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

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