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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: kidvid
cipher variations:
ljewje mkfxkf nlgylg omhzmh pniani
qojboj rpkcpk sqldql trmerm usnfsn
vtogto wuphup xvqivq ywrjwr zxskxs
aytlyt bzumzu cavnav dbwobw ecxpcx
fdyqdy gezrez hfasfa igbtgb jhcuhc

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: kidvid
Cipher: prwerw

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: kidvid
Cipher: ABAAB ABAAA AAABB BBBAB ABAAA AAABB

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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: kidvid
cipher variations:
ljewjefzkmzkzpqcpqtfwsfwnvcivchliylivrueruphauha
jxgkxgdnmanmxdsqdsrtygtymkfxkfgalnalaqrdqrugxtgx
owdjwdimjzmjwsvfsvqibvibkyhlyheonbonyetretsuzhuz
nlgylghbmobmbrsersvhyuhypxekxejnkankxtwgtwrjcwjc
lzimzifpocpozfusfutvaivaomhzmhicnpcncstfstwizviz
qyflyfkolbolyuxhuxskdxkdmajnajgqpdqpagvtgvuwbjwb
pnianijdoqdodtugtuxjawjarzgmzglpmcpmzvyivytleyle
nbkobkhrqerqbhwuhwvxckxcqojbojkeprepeuvhuvykbxkb
sahnahmqndqnawzjwzumfzmfoclpclisrfsrcixvixwydlyd
rpkcpklfqsfqfvwivwzlcylctbiobinroerobxakxavngang
pdmqdmjtsgtsdjywjyxzemzesqldqlmgrtgrgwxjwxamdzmd
ucjpcjospfspcyblybwohbohqenrenkuthutekzxkzyafnaf
trmermnhsuhshxykxybneanevdkqdkptqgtqdzcmzcxpicpi
rfosfolvuivuflaylazbgobgusnfsnoitvitiyzlyzcofbof
welrelqurhureadnadyqjdqjsgptgpmwvjwvgmbzmbachpch
vtogtopjuwjujzamzadpgcpgxfmsfmrvsivsfbeobezrkerk
thquhqnxwkxwhncancbdiqdiwuphupqkvxkvkabnabeqhdqh
ygntgnswtjwtgcfpcfaslfsluirviroyxlyxiodbodcejrej
xvqivqrlwylwlbcobcfrierizhouhotxukxuhdgqdgbtmgtm
vjswjspzymzyjpecpedfksfkywrjwrsmxzmxmcdpcdgsjfsj
aipvipuyvlyviehrehcunhunwktxktqaznazkqfdqfegltgl
zxskxstnyanyndeqdehtkgtkbjqwjqvzwmzwjfisfidvoivo
xluylurbaobalrgergfhmuhmaytlytuozbozoefrefiulhul
ckrxkrwaxnaxkgjtgjewpjwpymvzmvscbpcbmshfshginvin
bzumzuvpacpapfgsfgjvmivmdlsylsxbyobylhkuhkfxqkxq
znwanwtdcqdcntigtihjowjocavnavwqbdqbqghtghkwnjwn
emtzmtyczpczmilvilgyrlyraoxboxuedredoujhujikpxkp
dbwobwxrcercrhiuhilxokxofnuanuzdaqdanjmwjmhzsmzs
bpycpyvfesfepvkivkjlqylqecxpcxysdfsdsijvijmyplyp
govbovaebreboknxkniatnatcqzdqzwgftgfqwljwlkmrzmr
fdyqdyztegtetjkwjknzqmzqhpwcpwbfcsfcploylojbuobu
draeraxhguhgrxmkxmlnsansgezrezaufhufuklxkloarnar
iqxdqxcgdtgdqmpzmpkcvpcvesbfsbyihvihsynlynmotbot
hfasfabvgivgvlmylmpbsobsjryerydheuhernqanqldwqdw
ftcgtczjiwjitzomzonpucpuigbtgbcwhjwhwmnzmnqctpct
kszfszeifvifsorbormexrexgudhudakjxkjuapnapoqvdqv
jhcuhcdxikxixnoanorduqdultagtafjgwjgtpscpsnfysfy
hveiveblkylkvbqobqprwerwkidvideyjlyjyopbopsevrev
mubhubgkhxkhuqtdqtogztgziwfjwfcmlzmlwcrpcrqsxfsx

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: kidvid
Cipher: xvqivq

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: kidvid
Cipher: 524241154241

Extended Methods:
Method #1

Plaintext: kidvid
method variations:
poiaoiutoftozytlytedyqdy

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
k i d v i d 
5 4 4 1 4 4 
2 2 1 5 2 1 
They are then read out in rows:
544144221521
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: kidvid
Cipher: udtgvb

Read more ...
Method #3

Plaintext: kidvid
method variations:
rraurv raurvr aurvrr
urvrra rvrrau vrraur

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: kidvid

all 720 cipher variations:
kidvid kidvdi kidivd kididv kiddiv kiddvi kivdid kivddi kividd kividd kivdid
kivddi kiivdd kiivdd kiidvd kiiddv kiiddv kiidvd kidvid kidvdi kidivd kididv
kiddiv kiddvi kdivid kdivdi kdiivd kdiidv kdidiv kdidvi kdviid kdvidi kdviid
kdvidi kdvdii kdvdii kdivid kdivdi kdiivd kdiidv kdidiv kdidvi kddvii kddvii
kddivi kddiiv kddiiv kddivi kvdiid kvdidi kvdiid kvdidi kvddii kvddii kvidid
kviddi kviidd kviidd kvidid kviddi kviidd kviidd kvidid kviddi kviddi kvidid
kvdiid kvdidi kvdiid kvdidi kvddii kvddii kidvid kidvdi kidivd kididv kiddiv
kiddvi kivdid kivddi kividd kividd kivdid kivddi kiivdd kiivdd kiidvd kiiddv
kiiddv kiidvd kidvid kidvdi kidivd kididv kiddiv kiddvi kddvii kddvii kddivi
kddiiv kddiiv kddivi kdvdii kdvdii kdvidi kdviid kdviid kdvidi kdivdi kdivid
kdidvi kdidiv kdiidv kdiivd kdivid kdivdi kdiivd kdiidv kdidiv kdidvi ikdvid
ikdvdi ikdivd ikdidv ikddiv ikddvi ikvdid ikvddi ikvidd ikvidd ikvdid ikvddi
ikivdd ikivdd ikidvd ikiddv ikiddv ikidvd ikdvid ikdvdi ikdivd ikdidv ikddiv
ikddvi idkvid idkvdi idkivd idkidv idkdiv idkdvi idvkid idvkdi idvikd idvidk
idvdik idvdki idivkd idivdk idikvd idikdv ididkv ididvk iddvik iddvki iddivk
iddikv iddkiv iddkvi ivdkid ivdkdi ivdikd ivdidk ivddik ivddki ivkdid ivkddi
ivkidd ivkidd ivkdid ivkddi ivikdd ivikdd ividkd ividdk ividdk ividkd ivdkid
ivdkdi ivdikd ivdidk ivddik ivddki iidvkd iidvdk iidkvd iidkdv iiddkv iiddvk
iivdkd iivddk iivkdd iivkdd iivdkd iivddk iikvdd iikvdd iikdvd iikddv iikddv
iikdvd iidvkd iidvdk iidkvd iidkdv iiddkv iiddvk iddvik iddvki iddivk iddikv
iddkiv iddkvi idvdik idvdki idvidk idvikd idvkid idvkdi idivdk idivkd ididvk
ididkv idikdv idikvd idkvid idkvdi idkivd idkidv idkdiv idkdvi dikvid dikvdi
dikivd dikidv dikdiv dikdvi divkid divkdi divikd dividk divdik divdki diivkd
diivdk diikvd diikdv diidkv diidvk didvik didvki didivk didikv didkiv didkvi
dkivid dkivdi dkiivd dkiidv dkidiv dkidvi dkviid dkvidi dkviid dkvidi dkvdii
dkvdii dkivid dkivdi dkiivd dkiidv dkidiv dkidvi dkdvii dkdvii dkdivi dkdiiv
dkdiiv dkdivi dvkiid dvkidi dvkiid dvkidi dvkdii dvkdii dvikid dvikdi dviikd
dviidk dvidik dvidki dviikd dviidk dvikid dvikdi dvidki dvidik dvdiik dvdiki
dvdiik dvdiki dvdkii dvdkii dikvid dikvdi dikivd dikidv dikdiv dikdvi divkid
divkdi divikd dividk divdik divdki diivkd diivdk diikvd diikdv diidkv diidvk
didvik didvki didivk didikv didkiv didkvi ddkvii ddkvii ddkivi ddkiiv ddkiiv
ddkivi ddvkii ddvkii ddviki ddviik ddviik ddviki ddivki ddivik ddikvi ddikiv
ddiikv ddiivk ddivik ddivki ddiivk ddiikv ddikiv ddikvi vidkid vidkdi vidikd
vididk viddik viddki vikdid vikddi vikidd vikidd vikdid vikddi viikdd viikdd
viidkd viiddk viiddk viidkd vidkid vidkdi vidikd vididk viddik viddki vdikid
vdikdi vdiikd vdiidk vdidik vdidki vdkiid vdkidi vdkiid vdkidi vdkdii vdkdii
vdikid vdikdi vdiikd vdiidk vdidik vdidki vddkii vddkii vddiki vddiik vddiik
vddiki vkdiid vkdidi vkdiid vkdidi vkddii vkddii vkidid vkiddi vkiidd vkiidd
vkidid vkiddi vkiidd vkiidd vkidid vkiddi vkiddi vkidid vkdiid vkdidi vkdiid
vkdidi vkddii vkddii vidkid vidkdi vidikd vididk viddik viddki vikdid vikddi
vikidd vikidd vikdid vikddi viikdd viikdd viidkd viiddk viiddk viidkd vidkid
vidkdi vidikd vididk viddik viddki vddkii vddkii vddiki vddiik vddiik vddiki
vdkdii vdkdii vdkidi vdkiid vdkiid vdkidi vdikdi vdikid vdidki vdidik vdiidk
vdiikd vdikid vdikdi vdiikd vdiidk vdidik vdidki iidvkd iidvdk iidkvd iidkdv
iiddkv iiddvk iivdkd iivddk iivkdd iivkdd iivdkd iivddk iikvdd iikvdd iikdvd
iikddv iikddv iikdvd iidvkd iidvdk iidkvd iidkdv iiddkv iiddvk idivkd idivdk
idikvd idikdv ididkv ididvk idvikd idvidk idvkid idvkdi idvdki idvdik idkvid
idkvdi idkivd idkidv idkdiv idkdvi iddvki iddvik iddkvi iddkiv iddikv iddivk
ivdikd ivdidk ivdkid ivdkdi ivddki ivddik ividkd ividdk ivikdd ivikdd ividkd
ividdk ivkidd ivkidd ivkdid ivkddi ivkddi ivkdid ivdikd ivdidk ivdkid ivdkdi
ivddki ivddik ikdvid ikdvdi ikdivd ikdidv ikddiv ikddvi ikvdid ikvddi ikvidd
ikvidd ikvdid ikvddi ikivdd ikivdd ikidvd ikiddv ikiddv ikidvd ikdvid ikdvdi
ikdivd ikdidv ikddiv ikddvi iddvki iddvik iddkvi iddkiv iddikv iddivk idvdki
idvdik idvkdi idvkid idvikd idvidk idkvdi idkvid idkdvi idkdiv idkidv idkivd
idivkd idivdk idikvd idikdv ididkv ididvk didvik didvki didivk didikv didkiv
didkvi divdik divdki dividk divikd divkid divkdi diivdk diivkd diidvk diidkv
diikdv diikvd dikvid dikvdi dikivd dikidv dikdiv dikdvi ddivik ddivki ddiivk
ddiikv ddikiv ddikvi ddviik ddviki ddviik ddviki ddvkii ddvkii ddivik ddivki
ddiivk ddiikv ddikiv ddikvi ddkvii ddkvii ddkivi ddkiiv ddkiiv ddkivi dvdiik
dvdiki dvdiik dvdiki dvdkii dvdkii dvidik dvidki dviidk dviikd dvikid dvikdi
dviidk dviikd dvidik dvidki dvikdi dvikid dvkiid dvkidi dvkiid dvkidi dvkdii
dvkdii didvik didvki didivk didikv didkiv didkvi divdik divdki dividk divikd
divkid divkdi diivdk diivkd diidvk diidkv diikdv diikvd dikvid dikvdi dikivd
dikidv dikdiv dikdvi dkdvii dkdvii dkdivi dkdiiv dkdiiv dkdivi dkvdii dkvdii
dkvidi dkviid dkviid dkvidi dkivdi dkivid dkidvi dkidiv dkiidv dkiivd dkivid
dkivdi dkiivd dkiidv dkidiv dkidvi

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

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