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notogaeal

phosgenes

trachelismus

martfeld

linquereque

conspexeratis

krassina

staremque

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emmalyn

interchondral

darnel

pyramidion

dewlaps

diven

hiemabam

autogeny


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: yansun
cipher variations:
zbotvo acpuwp bdqvxq cerwyr dfsxzs
egtyat fhuzbu givacv hjwbdw ikxcex
jlydfy kmzegz lnafha mobgib npchjc
oqdikd prejle qsfkmf rtglng suhmoh
tvinpi uwjoqj vxkprk wylqsl xzmrtm

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: yansun
Cipher: bzmhfm

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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: yansun
Cipher: BABBA AAAAA ABBAA BAAAB BAABB 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: yansun
cipher variations:
zbotvovbodjorbonxonboxlojbohzofbornoxbolpotbovdo
pbofrolbopfohboztodbojhoacpuwpwcpekpscpoypocpymp
kcpiapgcpsopycpmqpucpwepqcpgspmcpqgpicpaupecpkip
bdqvxqxdqflqtdqpzqpdqznqldqjbqhdqtpqzdqnrqvdqxfq
rdqhtqndqrhqjdqbvqfdqljqcerwyryergmruerqarqeraor
merkcrieruqraerosrwerygrseriuroersirkercwrgermkr
dfsxzszfshnsvfsrbsrfsbpsnfsldsjfsvrsbfsptsxfszhs
tfsjvspfstjslfsdxshfsnlsegtyatagtiotwgtsctsgtcqt
ogtmetkgtwstcgtqutygtaitugtkwtqgtuktmgteytigtomt
fhuzbubhujpuxhutduthudruphunfulhuxtudhurvuzhubju
vhulxurhuvlunhufzujhupnugivacvcivkqvyivuevuivesv
qivogvmivyuveivswvaivckvwivmyvsivwmvoivgavkivqov
hjwbdwdjwlrwzjwvfwvjwftwrjwphwnjwzvwfjwtxwbjwdlw
xjwnzwtjwxnwpjwhbwljwrpwikxcexekxmsxakxwgxwkxgux
skxqixokxawxgkxuyxckxemxykxoaxukxyoxqkxicxmkxsqx
jlydfyflyntyblyxhyxlyhvytlyrjyplybxyhlyvzydlyfny
zlypbyvlyzpyrlyjdynlytrykmzegzgmzouzcmzyizymziwz
umzskzqmzcyzimzwazemzgozamzqczwmzaqzsmzkezomzusz
lnafhahnapvadnazjaznajxavnatlarnadzajnaxbafnahpa
bnardaxnabratnalfapnavtamobgibiobqwbeobakbaobkyb
wobumbsobeabkobycbgobiqbcobsebyobcsbuobmgbqobwub
npchjcjpcrxcfpcblcbpclzcxpcvnctpcfbclpczdchpcjrc
dpctfczpcdtcvpcnhcrpcxvcoqdikdkqdsydgqdcmdcqdmad
yqdwoduqdgcdmqdaediqdksdeqdugdaqdeudwqdoidsqdywd
prejlelretzehrednedrenbezrexpevrehdenrebfejrelte
frevhebrefvexrepjetrezxeqsfkmfmsfuafisfeofesfocf
asfyqfwsfiefosfcgfksfmufgsfwifcsfgwfysfqkfusfayf
rtglngntgvbgjtgfpgftgpdgbtgzrgxtgjfgptgdhgltgnvg
htgxjgdtghxgztgrlgvtgbzgsuhmohouhwchkuhgqhguhqeh
cuhashyuhkghquheihmuhowhiuhykheuhiyhauhsmhwuhcah
tvinpipvixdilvihrihvirfidvibtizvilhirvifjinvipxi
jvizlifvijzibvitnixvidbiuwjoqjqwjyejmwjisjiwjsgj
ewjcujawjmijswjgkjowjqyjkwjamjgwjkajcwjuojywjecj
vxkprkrxkzfknxkjtkjxkthkfxkdvkbxknjktxkhlkpxkrzk
lxkbnkhxklbkdxkvpkzxkfdkwylqslsylagloylkulkyluil
gylewlcylokluylimlqylsalmylcoliylmcleylwqlaylgel
xzmrtmtzmbhmpzmlvmlzmvjmhzmfxmdzmplmvzmjnmrzmtbm
nzmdpmjzmndmfzmxrmbzmhfmyansunuancinqanmwnmanwkn
iangyneanqmnwankonsanucnoaneqnkanoenganysncanign

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: yansun
Cipher: lnafha

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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: yansun
Cipher: 451133345433

Extended Methods:
Method #1

Plaintext: yansun
method variations:
dfsxzsilxcexoqchkctvhnph

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
y a n s u n 
4 1 3 3 5 3 
5 1 3 4 4 3 
They are then read out in rows:
413353513443
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: yansun
Cipher: dnpeso

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Method #3

Plaintext: yansun
method variations:
elnyos lnyose nyosel
yoseln oselny selnyo

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: yansun

all 720 cipher variations:
yansun yansnu yanusn yanuns yannus yannsu yasnun yasnnu yasunn yasunn yasnun
yasnnu yausnn yausnn yaunsn yaunns yaunns yaunsn yansun yansnu yanusn yanuns
yannus yannsu ynasun ynasnu ynausn ynauns ynanus ynansu ynsaun ynsanu ynsuan
ynsuna ynsnua ynsnau ynusan ynusna ynuasn ynuans ynunas ynunsa ynnsua ynnsau
ynnusa ynnuas ynnaus ynnasu ysnaun ysnanu ysnuan ysnuna ysnnua ysnnau ysanun
ysannu ysaunn ysaunn ysanun ysannu ysuann ysuann ysunan ysunna ysunna ysunan
ysnaun ysnanu ysnuan ysnuna ysnnua ysnnau yunsan yunsna yunasn yunans yunnas
yunnsa yusnan yusnna yusann yusann yusnan yusnna yuasnn yuasnn yuansn yuanns
yuanns yuansn yunsan yunsna yunasn yunans yunnas yunnsa ynnsua ynnsau ynnusa
ynnuas ynnaus ynnasu ynsnua ynsnau ynsuna ynsuan ynsaun ynsanu ynusna ynusan
ynunsa ynunas ynuans ynuasn ynasun ynasnu ynausn ynauns ynanus ynansu aynsun
aynsnu aynusn aynuns aynnus aynnsu aysnun aysnnu aysunn aysunn aysnun aysnnu
ayusnn ayusnn ayunsn ayunns ayunns ayunsn aynsun aynsnu aynusn aynuns aynnus
aynnsu anysun anysnu anyusn anyuns anynus anynsu ansyun ansynu ansuyn ansuny
ansnuy ansnyu anusyn anusny anuysn anuyns anunys anunsy annsuy annsyu annusy
annuys annyus annysu asnyun asnynu asnuyn asnuny asnnuy asnnyu asynun asynnu
asyunn asyunn asynun asynnu asuynn asuynn asunyn asunny asunny asunyn asnyun
asnynu asnuyn asnuny asnnuy asnnyu aunsyn aunsny aunysn aunyns aunnys aunnsy
ausnyn ausnny ausynn ausynn ausnyn ausnny auysnn auysnn auynsn auynns auynns
auynsn aunsyn aunsny aunysn aunyns aunnys aunnsy annsuy annsyu annusy annuys
annyus annysu ansnuy ansnyu ansuny ansuyn ansyun ansynu anusny anusyn anunsy
anunys anuyns anuysn anysun anysnu anyusn anyuns anynus anynsu naysun naysnu
nayusn nayuns naynus naynsu nasyun nasynu nasuyn nasuny nasnuy nasnyu nausyn
nausny nauysn nauyns naunys naunsy nansuy nansyu nanusy nanuys nanyus nanysu
nyasun nyasnu nyausn nyauns nyanus nyansu nysaun nysanu nysuan nysuna nysnua
nysnau nyusan nyusna nyuasn nyuans nyunas nyunsa nynsua nynsau nynusa nynuas
nynaus nynasu nsyaun nsyanu nsyuan nsyuna nsynua nsynau nsayun nsaynu nsauyn
nsauny nsanuy nsanyu nsuayn nsuany nsuyan nsuyna nsunya nsunay nsnauy nsnayu
nsnuay nsnuya nsnyua nsnyau nuysan nuysna nuyasn nuyans nuynas nuynsa nusyan
nusyna nusayn nusany nusnay nusnya nuasyn nuasny nuaysn nuayns nuanys nuansy
nunsay nunsya nunasy nunays nunyas nunysa nnysua nnysau nnyusa nnyuas nnyaus
nnyasu nnsyua nnsyau nnsuya nnsuay nnsauy nnsayu nnusya nnusay nnuysa nnuyas
nnuays nnuasy nnasuy nnasyu nnausy nnauys nnayus nnaysu sanyun sanynu sanuyn
sanuny sannuy sannyu saynun saynnu sayunn sayunn saynun saynnu sauynn sauynn
saunyn saunny saunny saunyn sanyun sanynu sanuyn sanuny sannuy sannyu snayun
snaynu snauyn snauny snanuy snanyu snyaun snyanu snyuan snyuna snynua snynau
snuyan snuyna snuayn snuany snunay snunya snnyua snnyau snnuya snnuay snnauy
snnayu synaun synanu synuan synuna synnua synnau syanun syannu syaunn syaunn
syanun syannu syuann syuann syunan syunna syunna syunan synaun synanu synuan
synuna synnua synnau sunyan sunyna sunayn sunany sunnay sunnya suynan suynna
suyann suyann suynan suynna suaynn suaynn suanyn suanny suanny suanyn sunyan
sunyna sunayn sunany sunnay sunnya snnyua snnyau snnuya snnuay snnauy snnayu
snynua snynau snyuna snyuan snyaun snyanu snuyna snuyan snunya snunay snuany
snuayn snayun snaynu snauyn snauny snanuy snanyu uansyn uansny uanysn uanyns
uannys uannsy uasnyn uasnny uasynn uasynn uasnyn uasnny uaysnn uaysnn uaynsn
uaynns uaynns uaynsn uansyn uansny uanysn uanyns uannys uannsy unasyn unasny
unaysn unayns unanys unansy unsayn unsany unsyan unsyna unsnya unsnay unysan
unysna unyasn unyans unynas unynsa unnsya unnsay unnysa unnyas unnays unnasy
usnayn usnany usnyan usnyna usnnya usnnay usanyn usanny usaynn usaynn usanyn
usanny usyann usyann usynan usynna usynna usynan usnayn usnany usnyan usnyna
usnnya usnnay uynsan uynsna uynasn uynans uynnas uynnsa uysnan uysnna uysann
uysann uysnan uysnna uyasnn uyasnn uyansn uyanns uyanns uyansn uynsan uynsna
uynasn uynans uynnas uynnsa unnsya unnsay unnysa unnyas unnays unnasy unsnya
unsnay unsyna unsyan unsayn unsany unysna unysan unynsa unynas unyans unyasn
unasyn unasny unaysn unayns unanys unansy nansuy nansyu nanusy nanuys nanyus
nanysu nasnuy nasnyu nasuny nasuyn nasyun nasynu nausny nausyn naunsy naunys
nauyns nauysn naysun naysnu nayusn nayuns naynus naynsu nnasuy nnasyu nnausy
nnauys nnayus nnaysu nnsauy nnsayu nnsuay nnsuya nnsyua nnsyau nnusay nnusya
nnuasy nnuays nnuyas nnuysa nnysua nnysau nnyusa nnyuas nnyaus nnyasu nsnauy
nsnayu nsnuay nsnuya nsnyua nsnyau nsanuy nsanyu nsauny nsauyn nsayun nsaynu
nsuany nsuayn nsunay nsunya nsuyna nsuyan nsyaun nsyanu nsyuan nsyuna nsynua
nsynau nunsay nunsya nunasy nunays nunyas nunysa nusnay nusnya nusany nusayn
nusyan nusyna nuasny nuasyn nuansy nuanys nuayns nuaysn nuysan nuysna nuyasn
nuyans nuynas nuynsa nynsua nynsau nynusa nynuas nynaus nynasu nysnua nysnau
nysuna nysuan nysaun nysanu nyusna nyusan nyunsa nyunas nyuans nyuasn nyasun
nyasnu nyausn nyauns nyanus nyansu

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History of cryptography
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