easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

mcelravy

taughton

wuxian

reddant

creton

pinyl

bulge

heterometabolism

aequaverant

hailshot

nonparent

monanthous

edgeman

exceperunt

antiquissimumque

sumpsimus

vitascopic

origenize


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: geogis
cipher variations:
hfphjt igqiku jhrjlv kiskmw ljtlnx
mkumoy nlvnpz omwoqa pnxprb qoyqsc
rpzrtd sqasue trbtvf uscuwg vtdvxh
wuewyi xvfxzj ywgyak zxhzbl ayiacm
bzjbdn cakceo dbldfp ecmegq fdnfhr

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: geogis
Cipher: tvltrh

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: geogis
Cipher: AABBA AABAA ABBAB AABBA ABAAA BAAAB

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: geogis
cipher variations:
hfphjttnrtzdfvtfpnrdvrfxdlxdvhptzplrnjdnrlzrfzhv
lzhlxfxhjxnpjpljdzvxnvtjigqikuuosuaegwugqosewsgy
emyewiquaqmsokeosmasgaiwmaimygyikyoqkqmkeawyowuk
jhrjlvvptvbfhxvhrptfxthzfnzfxjrvbrntplfptnbthbjx
nbjnzhzjlzprlrnlfbxzpxvlkiskmwwquwcgiywisqugyuia
goagykswcsouqmgquocuickyockoaiakmaqsmsomgcyaqywm
ljtlnxxrvxdhjzxjtrvhzvjbhpbhzltxdtpvrnhrvpdvjdlz
pdlpbjblnbrtntpnhdzbrzxnmkumoyyswyeikaykuswiawkc
iqciamuyeuqwsoiswqewkemaqemqckcmocsuouqoieacsayo
nlvnpzztxzfjlbzlvtxjbxldjrdjbnvzfvrxtpjtxrfxlfnb
rfnrdldnpdtvpvrpjfbdtbzpomwoqaauyagkmcamwuykcyme
ksekcowagwsyuqkuysgymgocsgosemeoqeuwqwsqkgceucaq
pnxprbbvzbhlndbnxvzldznfltfldpxbhxtzvrlvzthznhpd
thptfnfprfvxrxtrlhdfvdbrqoyqsccwacimoecoywameaog
mugmeqyciyuawsmwauiaoiqeuiqugogqsgwysyusmiegwecs
rpzrtddxbdjnpfdpzxbnfbphnvhnfrzdjzvbxtnxbvjbpjrf
vjrvhphrthxztzvtnjfhxfdtsqasueeycekoqgeqaycogcqi
owiogsaekawcyuoycwkcqksgwkswiqisuiyauawuokgiygeu
trbtvffzdflprhfrbzdphdrjpxjphtbflbxdzvpzdxldrlth
xltxjrjtvjzbvbxvplhjzhfvuscuwggaegmqsigscaeqiesk
qykqiucgmcyeawqaeymesmuiymuykskuwkacwcywqmikaigw
vtdvxhhbfhnrtjhtdbfrjftlrzlrjvdhndzfbxrbfznftnvj
znvzltlvxlbdxdzxrnjlbjhxwuewyiicgiosukiuecgskgum
samskweioeagcyscgaoguowkaowamumwymceyeaysokmckiy
xvfxzjjdhjptvljvfdhtlhvntbntlxfjpfbhdztdhbphvpxl
bpxbnvnxzndfzfbztplndljzywgyakkeikquwmkwgeiumiwo
ucoumygkqgcieaueicqiwqymcqycowoyaoegagcauqmoemka
zxhzbllfjlrvxnlxhfjvnjxpvdpvnzhlrhdjfbvfjdrjxrzn
drzdpxpzbpfhbhdbvrnpfnlbayiacmmgkmswyomyigkwokyq
weqwoaimsiekgcwgkeskysaoesaeqyqacqgiciecwsoqgomc
bzjbdnnhlntxzpnzjhlxplzrxfrxpbjntjflhdxhlftlztbp
ftbfrzrbdrhjdjfdxtprhpndcakceooimouyaqoakimyqmas
ygsyqckoukgmieyimgumaucqgucgsascesikekgeyuqsiqoe
dbldfppjnpvzbrpbljnzrnbtzhtzrdlpvlhnjfzjnhvnbvdr
hvdhtbtdftjlflhfzvrtjrpfecmegqqkoqwacsqcmkoasocu
aiuasemqwmiokgakoiwocwesiweiucuegukmgmigawsuksqg
fdnfhrrlprxbdtrdnlpbtpdvbjvbtfnrxnjplhblpjxpdxft
jxfjvdvfhvlnhnjhbxtvltrhgeogissmqsyceuseomqcuqew
ckwcugosyokqmicmqkyqeygukygkwewgiwmoiokicyuwmusi

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: geogis
Cipher: trbtvf

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: geogis
Cipher: 225143224234

Extended Methods:
Method #1

Plaintext: geogis
method variations:
mktmoxrpyrtcwudwyhbzibdn

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
g e o g i s 
2 5 4 2 4 3 
2 1 3 2 2 4 
They are then read out in rows:
254243213224
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: geogis
Cipher: wiobhr

Read more ...
Method #3

Plaintext: geogis
method variations:
wqhrmi qhrmiw hrmiwq
rmiwqh miwqhr iwqhrm

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: geogis

all 720 cipher variations:
geogis geogsi geoigs geoisg geosig geosgi gegois gegosi gegios gegiso gegsio
gegsoi geigos geigso geiogs geiosg geisog geisgo gesgio gesgoi gesigo gesiog
gesoig gesogi goegis goegsi goeigs goeisg goesig goesgi gogeis gogesi gogies
gogise gogsie gogsei goiges goigse goiegs goiesg goiseg goisge gosgie gosgei
gosige gosieg goseig gosegi ggoeis ggoesi ggoies ggoise ggosie ggosei ggeois
ggeosi ggeios ggeiso ggesio ggesoi ggieos ggieso ggioes ggiose ggisoe ggiseo
ggseio ggseoi ggsieo ggsioe ggsoie ggsoei gioges giogse gioegs gioesg gioseg
giosge gigoes gigose gigeos gigeso gigseo gigsoe giegos giegso gieogs gieosg
giesog giesgo gisgeo gisgoe gisego giseog gisoeg gisoge gsogie gsogei gsoige
gsoieg gsoeig gsoegi gsgoie gsgoei gsgioe gsgieo gsgeio gsgeoi gsigoe gsigeo
gsioge gsioeg gsieog gsiego gsegio gsegoi gseigo gseiog gseoig gseogi egogis
egogsi egoigs egoisg egosig egosgi eggois eggosi eggios eggiso eggsio eggsoi
egigos egigso egiogs egiosg egisog egisgo egsgio egsgoi egsigo egsiog egsoig
egsogi eoggis eoggsi eogigs eogisg eogsig eogsgi eoggis eoggsi eogigs eogisg
eogsig eogsgi eoiggs eoigsg eoiggs eoigsg eoisgg eoisgg eosgig eosggi eosigg
eosigg eosgig eosggi egogis egogsi egoigs egoisg egosig egosgi eggois eggosi
eggios eggiso eggsio eggsoi egigos egigso egiogs egiosg egisog egisgo egsgio
egsgoi egsigo egsiog egsoig egsogi eioggs eiogsg eioggs eiogsg eiosgg eiosgg
eigogs eigosg eiggos eiggso eigsgo eigsog eiggos eiggso eigogs eigosg eigsog
eigsgo eisggo eisgog eisggo eisgog eisogg eisogg esogig esoggi esoigg esoigg
esogig esoggi esgoig esgogi esgiog esgigo esggio esggoi esigog esiggo esiogg
esiogg esigog esiggo esggio esggoi esgigo esgiog esgoig esgogi oeggis oeggsi
oegigs oegisg oegsig oegsgi oeggis oeggsi oegigs oegisg oegsig oegsgi oeiggs
oeigsg oeiggs oeigsg oeisgg oeisgg oesgig oesggi oesigg oesigg oesgig oesggi
ogegis ogegsi ogeigs ogeisg ogesig ogesgi oggeis oggesi oggies oggise oggsie
oggsei ogiges ogigse ogiegs ogiesg ogiseg ogisge ogsgie ogsgei ogsige ogsieg
ogseig ogsegi oggeis oggesi oggies oggise oggsie oggsei ogegis ogegsi ogeigs
ogeisg ogesig ogesgi ogiegs ogiesg ogiges ogigse ogisge ogiseg ogseig ogsegi
ogsieg ogsige ogsgie ogsgei oigges oiggse oigegs oigesg oigseg oigsge oigges
oiggse oigegs oigesg oigseg oigsge oieggs oiegsg oieggs oiegsg oiesgg oiesgg
oisgeg oisgge oisegg oisegg oisgeg oisgge osggie osggei osgige osgieg osgeig
osgegi osggie osggei osgige osgieg osgeig osgegi osigge osigeg osigge osigeg
osiegg osiegg osegig oseggi oseigg oseigg osegig oseggi geogis geogsi geoigs
geoisg geosig geosgi gegois gegosi gegios gegiso gegsio gegsoi geigos geigso
geiogs geiosg geisog geisgo gesgio gesgoi gesigo gesiog gesoig gesogi goegis
goegsi goeigs goeisg goesig goesgi gogeis gogesi gogies gogise gogsie gogsei
goiges goigse goiegs goiesg goiseg goisge gosgie gosgei gosige gosieg goseig
gosegi ggoeis ggoesi ggoies ggoise ggosie ggosei ggeois ggeosi ggeios ggeiso
ggesio ggesoi ggieos ggieso ggioes ggiose ggisoe ggiseo ggseio ggseoi ggsieo
ggsioe ggsoie ggsoei gioges giogse gioegs gioesg gioseg giosge gigoes gigose
gigeos gigeso gigseo gigsoe giegos giegso gieogs gieosg giesog giesgo gisgeo
gisgoe gisego giseog gisoeg gisoge gsogie gsogei gsoige gsoieg gsoeig gsoegi
gsgoie gsgoei gsgioe gsgieo gsgeio gsgeoi gsigoe gsigeo gsioge gsioeg gsieog
gsiego gsegio gsegoi gseigo gseiog gseoig gseogi ieoggs ieogsg ieoggs ieogsg
ieosgg ieosgg iegogs iegosg ieggos ieggso iegsgo iegsog ieggos ieggso iegogs
iegosg iegsog iegsgo iesggo iesgog iesggo iesgog iesogg iesogg ioeggs ioegsg
ioeggs ioegsg ioesgg ioesgg iogegs iogesg iogges ioggse iogsge iogseg iogges
ioggse iogegs iogesg iogseg iogsge iosgge iosgeg iosgge iosgeg iosegg iosegg
igoegs igoesg igoges igogse igosge igoseg igeogs igeosg igegos igegso igesgo
igesog iggeos iggeso iggoes iggose iggsoe iggseo igsego igseog igsgeo igsgoe
igsoge igsoeg igoges igogse igoegs igoesg igoseg igosge iggoes iggose iggeos
iggeso iggseo iggsoe igegos igegso igeogs igeosg igesog igesgo igsgeo igsgoe
igsego igseog igsoeg igsoge isogge isogeg isogge isogeg isoegg isoegg isgoge
isgoeg isggoe isggeo isgego isgeog isggoe isggeo isgoge isgoeg isgeog isgego
iseggo isegog iseggo isegog iseogg iseogg seogig seoggi seoigg seoigg seogig
seoggi segoig segogi segiog segigo seggio seggoi seigog seiggo seiogg seiogg
seigog seiggo seggio seggoi segigo segiog segoig segogi soegig soeggi soeigg
soeigg soegig soeggi sogeig sogegi sogieg sogige soggie soggei soigeg soigge
soiegg soiegg soigeg soigge soggie soggei sogige sogieg sogeig sogegi sgoeig
sgoegi sgoieg sgoige sgogie sgogei sgeoig sgeogi sgeiog sgeigo sgegio sgegoi
sgieog sgiego sgioeg sgioge sgigoe sgigeo sggeio sggeoi sggieo sggioe sggoie
sggoei siogeg siogge sioegg sioegg siogeg siogge sigoeg sigoge sigeog sigego
siggeo siggoe siegog sieggo sieogg sieogg siegog sieggo siggeo siggoe sigego
sigeog sigoeg sigoge sgogie sgogei sgoige sgoieg sgoeig sgoegi sggoie sggoei
sggioe sggieo sggeio sggeoi sgigoe sgigeo sgioge sgioeg sgieog sgiego sgegio
sgegoi sgeigo sgeiog sgeoig sgeogi

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

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