easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

pulsions

classicalism

versabantur

recedat

hatty

rightly

battel

carnegia

waivery

basipoditic

undeviating

maricolous

maxumaque

uncontrastable

hostileness

cajoler

farrantly

hallstattian


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: rompon
cipher variations:
spnqpo tqorqp urpsrq vsqtsr wtruts
xusvut yvtwvu zwuxwv axvyxw bywzyx
czxazy daybaz ebzcba fcadcb gdbedc
hecfed ifdgfe jgehgf khfihg ligjih
mjhkji nkilkj oljmlk pmknml qnlonm

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: rompon
Cipher: ilnklm

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: rompon
Cipher: BAAAA ABBAB ABABB ABBBA ABBAB ABBAA

Read more ...

 

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: rompon
cipher variations:
spnqpoarluroitjytoqvhcvoyxfgxogzdkzowdzsdoefxwfo
mhvahoujtejoclriloknpmnotqorqpbsmvspjukzuprwidwp
zyghyphaelapxeatepfgyxgpniwbipvkufkpdmsjmploqnop
urpsrqctnwtqkvlavqsxjexqazhizqibfmbqyfbufqghzyhq
ojxcjqwlvglqentknqmpropqvsqtsrduoxurlwmbwrtykfyr
baijarjcgncrzgcvgrhiazirpkydkrxmwhmrfoulornqspqr
wtrutsevpyvsmxncxsuzlgzscbjkbskdhodsahdwhsijbajs
qlzelsynxinsgpvmpsortqrsxusvutfwqzwtnyodytvamhat
dcklctleipetbiexitjkcbktrmafmtzoyjothqwnqtpsurst
yvtwvugxraxuozpezuwbnibuedlmdumfjqfucjfyjukldclu
snbgnuapzkpuirxoruqtvstuzwuxwvhysbyvpaqfavxcojcv
femnevngkrgvdkgzkvlmedmvtochovbqalqvjsypsvruwtuv
axvyxwiztczwqbrgbwydpkdwgfnofwohlshwelhalwmnfenw
updipwcrbmrwktzqtwsvxuvwbywzyxjaudaxrcshcxzeqlex
hgopgxpimtixfmibmxnogfoxvqejqxdscnsxluaruxtwyvwx
czxazykbvebysdtidyafrmfyihpqhyqjnujygnjcnyophgpy
wrfkryetdotymvbsvyuxzwxydaybazlcwfczteujezbgsngz
jiqrizrkovkzhokdozpqihqzxsglszfuepuznwctwzvyaxyz
ebzcbamdxgdaufvkfachtohakjrsjaslpwlaiplepaqrjira
ythmtagvfqvaoxduxawzbyzafcadcbneyhebvgwlgbdiupib
lkstkbtmqxmbjqmfqbrskjsbzuinubhwgrwbpyevybxaczab
gdbedcofzifcwhxmhcejvqjcmltulcunrynckrngrcstlktc
avjovcixhsxcqzfwzcybdabchecfedpgajgdxiynidfkwrkd
nmuvmdvoszodlsohsdtumludbwkpwdjyitydragxadzcebcd
ifdgfeqhbkheyjzojeglxsleonvwnewptapemtpiteuvnmve
cxlqxekzjuzesbhybeadfcdejgehgfriclifzkapkfhmytmf
powxofxqubqfnuqjufvwonwfdymryflakvaftcizcfbegdef
khfihgsjdmjgalbqlginzungqpxypgyrvcrgovrkvgwxpoxg
eznszgmblwbgudjadgcfhefgligjihtkenkhbmcrmhjoavoh
rqyzqhzswdshpwslwhxyqpyhfaotahncmxchvekbehdgifgh
mjhkjiulfolicndsnikpbwpisrzariatxetiqxtmxiyzrqzi
gbpubiodnydiwflcfiehjghinkilkjvmgpmjdoetojlqcxqj
tsabsjbuyfujryunyjzasrajhcqvcjpeozejxgmdgjfikhij
oljmlkwnhqnkepfupkmrdyrkutbctkcvzgvkszvozkabtsbk
idrwdkqfpafkyhnehkgjlijkpmknmlxoirolfqgvqlnsezsl
vucduldwahwltawpalbcutcljesxelrgqbglziofilhkmjkl
qnlonmypjspmgrhwrmotfatmwvdevmexbixmubxqbmcdvudm
kftyfmshrchmajpgjmilnklmromponzqktqnhsixsnpugbun
xwefwnfycjynvcyrcndewvenlguzgntisdinbkqhknjmolmn

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: rompon
Cipher: ebzcba

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: rompon
Cipher: 244323534333

Extended Methods:
Method #1

Plaintext: rompon
method variations:
wtrutsbywzyxgdbedcmigkih

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
r o m p o n 
2 4 2 5 4 3 
4 3 3 3 3 3 
They are then read out in rows:
242543433333
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: rompon
Cipher: rwoonn

Read more ...
Method #3

Plaintext: rompon
method variations:
thxsnh hxsnht xsnhth
snhthx nhthxs hthxsn

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: rompon

all 720 cipher variations:
rompon rompno romopn romonp romnop romnpo ropmon ropmno ropomn roponm ropnom
ropnmo roopmn roopnm roompn roomnp roonmp roonpm ronpom ronpmo ronopm ronomp
ronmop ronmpo rmopon rmopno rmoopn rmoonp rmonop rmonpo rmpoon rmpono rmpoon
rmpono rmpnoo rmpnoo rmopon rmopno rmoopn rmoonp rmonop rmonpo rmnpoo rmnpoo
rmnopo rmnoop rmnoop rmnopo rpmoon rpmono rpmoon rpmono rpmnoo rpmnoo rpomon
rpomno rpoomn rpoonm rponom rponmo rpoomn rpoonm rpomon rpomno rponmo rponom
rpnoom rpnomo rpnoom rpnomo rpnmoo rpnmoo rompon rompno romopn romonp romnop
romnpo ropmon ropmno ropomn roponm ropnom ropnmo roopmn roopnm roompn roomnp
roonmp roonpm ronpom ronpmo ronopm ronomp ronmop ronmpo rnmpoo rnmpoo rnmopo
rnmoop rnmoop rnmopo rnpmoo rnpmoo rnpomo rnpoom rnpoom rnpomo rnopmo rnopom
rnompo rnomop rnoomp rnoopm rnopom rnopmo rnoopm rnoomp rnomop rnompo ormpon
ormpno ormopn ormonp ormnop ormnpo orpmon orpmno orpomn orponm orpnom orpnmo
oropmn oropnm orompn oromnp oronmp oronpm ornpom ornpmo ornopm ornomp ornmop
ornmpo omrpon omrpno omropn omronp omrnop omrnpo ompron omprno omporn omponr
ompnor ompnro omoprn omopnr omorpn omornp omonrp omonpr omnpor omnpro omnopr
omnorp omnrop omnrpo opmron opmrno opmorn opmonr opmnor opmnro oprmon oprmno
opromn opronm oprnom oprnmo opormn opornm opomrn opomnr oponmr oponrm opnrom
opnrmo opnorm opnomr opnmor opnmro oomprn oompnr oomrpn oomrnp oomnrp oomnpr
oopmrn oopmnr ooprmn ooprnm oopnrm oopnmr oorpmn oorpnm oormpn oormnp oornmp
oornpm oonprm oonpmr oonrpm oonrmp oonmrp oonmpr onmpor onmpro onmopr onmorp
onmrop onmrpo onpmor onpmro onpomr onporm onprom onprmo onopmr onoprm onompr
onomrp onormp onorpm onrpom onrpmo onropm onromp onrmop onrmpo morpon morpno
moropn moronp mornop mornpo mopron moprno moporn moponr mopnor mopnro mooprn
moopnr moorpn moornp moonrp moonpr monpor monpro monopr monorp monrop monrpo
mropon mropno mroopn mroonp mronop mronpo mrpoon mrpono mrpoon mrpono mrpnoo
mrpnoo mropon mropno mroopn mroonp mronop mronpo mrnpoo mrnpoo mrnopo mrnoop
mrnoop mrnopo mproon mprono mproon mprono mprnoo mprnoo mporon mporno mpoorn
mpoonr mponor mponro mpoorn mpoonr mporon mporno mponro mponor mpnoor mpnoro
mpnoor mpnoro mpnroo mpnroo morpon morpno moropn moronp mornop mornpo mopron
moprno moporn moponr mopnor mopnro mooprn moopnr moorpn moornp moonrp moonpr
monpor monpro monopr monorp monrop monrpo mnrpoo mnrpoo mnropo mnroop mnroop
mnropo mnproo mnproo mnporo mnpoor mnpoor mnporo mnopro mnopor mnorpo mnorop
mnoorp mnoopr mnopor mnopro mnoopr mnoorp mnorop mnorpo pomron pomrno pomorn
pomonr pomnor pomnro pormon pormno poromn poronm pornom pornmo poormn poornm
poomrn poomnr poonmr poonrm ponrom ponrmo ponorm ponomr ponmor ponmro pmoron
pmorno pmoorn pmoonr pmonor pmonro pmroon pmrono pmroon pmrono pmrnoo pmrnoo
pmoron pmorno pmoorn pmoonr pmonor pmonro pmnroo pmnroo pmnoro pmnoor pmnoor
pmnoro prmoon prmono prmoon prmono prmnoo prmnoo promon promno proomn proonm
pronom pronmo proomn proonm promon promno pronmo pronom prnoom prnomo prnoom
prnomo prnmoo prnmoo pomron pomrno pomorn pomonr pomnor pomnro pormon pormno
poromn poronm pornom pornmo poormn poornm poomrn poomnr poonmr poonrm ponrom
ponrmo ponorm ponomr ponmor ponmro pnmroo pnmroo pnmoro pnmoor pnmoor pnmoro
pnrmoo pnrmoo pnromo pnroom pnroom pnromo pnormo pnorom pnomro pnomor pnoomr
pnoorm pnorom pnormo pnoorm pnoomr pnomor pnomro oomprn oompnr oomrpn oomrnp
oomnrp oomnpr oopmrn oopmnr ooprmn ooprnm oopnrm oopnmr oorpmn oorpnm oormpn
oormnp oornmp oornpm oonprm oonpmr oonrpm oonrmp oonmrp oonmpr omoprn omopnr
omorpn omornp omonrp omonpr omporn omponr ompron omprno ompnro ompnor omrpon
omrpno omropn omronp omrnop omrnpo omnpro omnpor omnrpo omnrop omnorp omnopr
opmorn opmonr opmron opmrno opmnro opmnor opomrn opomnr opormn opornm oponrm
oponmr opromn opronm oprmon oprmno oprnmo oprnom opnorm opnomr opnrom opnrmo
opnmro opnmor ormpon ormpno ormopn ormonp ormnop ormnpo orpmon orpmno orpomn
orponm orpnom orpnmo oropmn oropnm orompn oromnp oronmp oronpm ornpom ornpmo
ornopm ornomp ornmop ornmpo onmpro onmpor onmrpo onmrop onmorp onmopr onpmro
onpmor onprmo onprom onporm onpomr onrpmo onrpom onrmpo onrmop onromp onropm
onoprm onopmr onorpm onormp onomrp onompr nompor nompro nomopr nomorp nomrop
nomrpo nopmor nopmro nopomr noporm noprom noprmo noopmr nooprm noompr noomrp
noormp noorpm norpom norpmo noropm noromp normop normpo nmopor nmopro nmoopr
nmoorp nmorop nmorpo nmpoor nmporo nmpoor nmporo nmproo nmproo nmopor nmopro
nmoopr nmoorp nmorop nmorpo nmrpoo nmrpoo nmropo nmroop nmroop nmropo npmoor
npmoro npmoor npmoro npmroo npmroo npomor npomro npoomr npoorm nporom npormo
npoomr npoorm npomor npomro npormo nporom nproom npromo nproom npromo nprmoo
nprmoo nompor nompro nomopr nomorp nomrop nomrpo nopmor nopmro nopomr noporm
noprom noprmo noopmr nooprm noompr noomrp noormp noorpm norpom norpmo noropm
noromp normop normpo nrmpoo nrmpoo nrmopo nrmoop nrmoop nrmopo nrpmoo nrpmoo
nrpomo nrpoom nrpoom nrpomo nropmo nropom nrompo nromop nroomp nroopm nropom
nropmo nroopm nroomp nromop nrompo

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

History of cryptography
2011 Easy Ciphers. All rights reserved. contact us