easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

pbsdpc

penthrite

bloodweed

toolholder

toimisto

uncentral

guinfo

abishag

inbody

delegacies

proudness

retuned

niggarded

danoranja

emodins

unformal

arthromere

annuo


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: feyler
cipher variations:
gfzmfs hgangt ihbohu jicpiv kjdqjw
lkerkx mlfsly nmgtmz onhuna poivob
qpjwpc rqkxqd srlyre tsmzsf utnatg
vuobuh wvpcvi xwqdwj yxrexk zysfyl
aztgzm bauhan cbvibo dcwjcp edxkdq

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: feyler
Cipher: uvbovi

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: feyler
Cipher: AABAB AABAA BABBA ABABA AABAA BAAAA

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: feyler
cipher variations:
gfzmfsqnvinaavrevikdnadquljwlyetfstgyjxkjwirtgre
szpczmchlyhumphupcwxdqxkhgangtrowjobbwsfwjleober
vmkxmzfugtuhzkylkxjsuhsftaqdandimzivnqivqdxyeryl
ihbohuspxkpccxtgxkmfpcfswnlynagvhuvialzmlyktvitg
ubreboejnajworjwreyzfszmjicpivtqylqddyuhylngqdgt
xomzobhwivwjbmanmzluwjuhvcsfcpfkobkxpskxsfzagtan
kjdqjwurzmreezvizmohrehuypnapcixjwxkcnbonamvxkvi
wdtgdqglpclyqtlytgabhubolkerkxvsansffawjanpisfiv
zqobqdjykxyldocpobnwylwjxeuherhmqdmzrumzuhbcivcp
mlfslywtbotggbxkboqjtgjwarpcrekzlyzmepdqpcoxzmxk
yfvifsinrenasvnavicdjwdqnmgtmzxucpuhhcylcprkuhkx
bsqdsflamzanfqerqdpyanylzgwjgtjosfobtwobwjdekxer
onhunayvdqviidzmdqslvilyctretgmbnabogrfsreqzbozm
ahxkhukptgpcuxpcxkeflyfspoivobzwerwjjeanertmwjmz
dusfuhncobcphsgtsfracpanbiylivlquhqdvyqdylfgmzgt
qpjwpcaxfsxkkfbofsunxknaevtgviodpcdqithutgsbdqbo
cjzmjwmrvirewzrezmghnahurqkxqdbygtyllgcpgtvoylob
fwuhwjpeqderjuivuhtcercpdkankxnswjsfxasfanhiobiv
srlyreczhuzmmhdqhuwpzmpcgxvixkqfrefskvjwviudfsdq
elbolyotxktgybtgboijpcjwtsmzsfdaivannierivxqanqd
hywjylrgsfgtlwkxwjvegterfmcpmzpuyluhzcuhcpjkqdkx
utnatgebjwboojfsjwyrboreizxkzmshtghumxlyxkwfhufs
gndqnaqvzmviadvidqklrelyvuobuhfckxcppkgtkxzscpsf
jaylantiuhivnymzylxgivgthoerobrwanwjbewjerlmsfmz
wvpcvigdlydqqlhulyatdqtgkbzmboujvijwoznazmyhjwhu
ipfspcsxboxkcfxkfsmntgnaxwqdwjhemzerrmivmzbueruh
lcancpvkwjkxpaobanzikxivjqgtqdtycpyldgylgtnouhob
yxrexkifnafssnjwnacvfsvimdbodqwlxklyqbpcboajlyjw
krhureuzdqzmehzmhuopvipczysfyljgobgttokxobdwgtwj
necperxmylmzrcqdcpbkmzkxlsivsfvaeranfianivpqwjqd
aztgzmkhpchuuplypcexhuxkofdqfsynzmnasdredqclnaly
mtjwtgwbfsbogjbojwqrxkrebauhanliqdivvqmzqdfyivyl
pgergtzoanobtesferdmobmznukxuhxcgtcphkcpkxrsylsf
cbvibomjrejwwrnaregzjwzmqhfshuapbopcuftgfsenpcna
ovlyviydhudqildqlystzmtgdcwjcpnksfkxxsobsfhakxan
rigtivbqcpqdvguhgtfoqdobpwmzwjzeiverjmermztuanuh
edxkdqoltglyytpctgiblybosjhujwcrdqrewhvihugprepc
qxnaxkafjwfsknfsnauvbovifeylerpmuhmzzuqduhjcmzcp
tkivkxdsersfxiwjivhqsfqdryobylbgkxgtlogtobvwcpwj

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: feyler
Cipher: srlyre

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: feyler
Cipher: 125145135124

Extended Methods:
Method #1

Plaintext: feyler
method variations:
lkdqkwqpivpbvuoaugaztfzm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
f e y l e r 
1 5 4 1 5 2 
2 1 5 3 1 4 
They are then read out in rows:
154152215314
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: feyler
Cipher: vdkbpq

Read more ...
Method #3

Plaintext: feyler
method variations:
wqexfd qexfdw exfdwq
xfdwqe fdwqex dwqexf

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: feyler

all 720 cipher variations:
feyler feylre feyelr feyerl feyrel feyrle felyer felyre feleyr felery felrey
felrye feelyr feelry feeylr feeyrl feeryl feerly ferley ferlye ferely fereyl
feryel feryle fyeler fyelre fyeelr fyeerl fyerel fyerle fyleer fylere fyleer
fylere fylree fylree fyeler fyelre fyeelr fyeerl fyerel fyerle fyrlee fyrlee
fyrele fyreel fyreel fyrele flyeer flyere flyeer flyere flyree flyree fleyer
fleyre fleeyr fleery flerey flerye fleeyr fleery fleyer fleyre flerye flerey
flreey flreye flreey flreye flryee flryee feyler feylre feyelr feyerl feyrel
feyrle felyer felyre feleyr felery felrey felrye feelyr feelry feeylr feeyrl
feeryl feerly ferley ferlye ferely fereyl feryel feryle frylee frylee fryele
fryeel fryeel fryele frlyee frlyee frleye frleey frleey frleye frelye freley
freyle freyel freeyl freely freley frelye freely freeyl freyel freyle efyler
efylre efyelr efyerl efyrel efyrle eflyer eflyre efleyr eflery eflrey eflrye
efelyr efelry efeylr efeyrl eferyl eferly efrley efrlye efrely efreyl efryel
efryle eyfler eyflre eyfelr eyferl eyfrel eyfrle eylfer eylfre eylefr eylerf
eylref eylrfe eyelfr eyelrf eyeflr eyefrl eyerfl eyerlf eyrlef eyrlfe eyrelf
eyrefl eyrfel eyrfle elyfer elyfre elyefr elyerf elyref elyrfe elfyer elfyre
elfeyr elfery elfrey elfrye elefyr elefry eleyfr eleyrf eleryf elerfy elrfey
elrfye elrefy elreyf elryef elryfe eeylfr eeylrf eeyflr eeyfrl eeyrfl eeyrlf
eelyfr eelyrf eelfyr eelfry eelrfy eelryf eeflyr eeflry eefylr eefyrl eefryl
eefrly eerlfy eerlyf eerfly eerfyl eeryfl eerylf erylef erylfe eryelf eryefl
eryfel eryfle erlyef erlyfe erleyf erlefy erlfey erlfye erelyf erelfy ereylf
ereyfl erefyl erefly erfley erflye erfely erfeyl erfyel erfyle yefler yeflre
yefelr yeferl yefrel yefrle yelfer yelfre yelefr yelerf yelref yelrfe yeelfr
yeelrf yeeflr yeefrl yeerfl yeerlf yerlef yerlfe yerelf yerefl yerfel yerfle
yfeler yfelre yfeelr yfeerl yferel yferle yfleer yflere yfleer yflere yflree
yflree yfeler yfelre yfeelr yfeerl yferel yferle yfrlee yfrlee yfrele yfreel
yfreel yfrele ylfeer ylfere ylfeer ylfere ylfree ylfree ylefer ylefre yleefr
yleerf yleref ylerfe yleefr yleerf ylefer ylefre ylerfe yleref ylreef ylrefe
ylreef ylrefe ylrfee ylrfee yefler yeflre yefelr yeferl yefrel yefrle yelfer
yelfre yelefr yelerf yelref yelrfe yeelfr yeelrf yeeflr yeefrl yeerfl yeerlf
yerlef yerlfe yerelf yerefl yerfel yerfle yrflee yrflee yrfele yrfeel yrfeel
yrfele yrlfee yrlfee yrlefe yrleef yrleef yrlefe yrelfe yrelef yrefle yrefel
yreefl yreelf yrelef yrelfe yreelf yreefl yrefel yrefle leyfer leyfre leyefr
leyerf leyref leyrfe lefyer lefyre lefeyr lefery lefrey lefrye leefyr leefry
leeyfr leeyrf leeryf leerfy lerfey lerfye lerefy lereyf leryef leryfe lyefer
lyefre lyeefr lyeerf lyeref lyerfe lyfeer lyfere lyfeer lyfere lyfree lyfree
lyefer lyefre lyeefr lyeerf lyeref lyerfe lyrfee lyrfee lyrefe lyreef lyreef
lyrefe lfyeer lfyere lfyeer lfyere lfyree lfyree lfeyer lfeyre lfeeyr lfeery
lferey lferye lfeeyr lfeery lfeyer lfeyre lferye lferey lfreey lfreye lfreey
lfreye lfryee lfryee leyfer leyfre leyefr leyerf leyref leyrfe lefyer lefyre
lefeyr lefery lefrey lefrye leefyr leefry leeyfr leeyrf leeryf leerfy lerfey
lerfye lerefy lereyf leryef leryfe lryfee lryfee lryefe lryeef lryeef lryefe
lrfyee lrfyee lrfeye lrfeey lrfeey lrfeye lrefye lrefey lreyfe lreyef lreeyf
lreefy lrefey lrefye lreefy lreeyf lreyef lreyfe eeylfr eeylrf eeyflr eeyfrl
eeyrfl eeyrlf eelyfr eelyrf eelfyr eelfry eelrfy eelryf eeflyr eeflry eefylr
eefyrl eefryl eefrly eerlfy eerlyf eerfly eerfyl eeryfl eerylf eyelfr eyelrf
eyeflr eyefrl eyerfl eyerlf eylefr eylerf eylfer eylfre eylrfe eylref eyfler
eyflre eyfelr eyferl eyfrel eyfrle eyrlfe eyrlef eyrfle eyrfel eyrefl eyrelf
elyefr elyerf elyfer elyfre elyrfe elyref eleyfr eleyrf elefyr elefry elerfy
eleryf elfeyr elfery elfyer elfyre elfrye elfrey elrefy elreyf elrfey elrfye
elryfe elryef efyler efylre efyelr efyerl efyrel efyrle eflyer eflyre efleyr
eflery eflrey eflrye efelyr efelry efeylr efeyrl eferyl eferly efrley efrlye
efrely efreyl efryel efryle erylfe erylef eryfle eryfel eryefl eryelf erlyfe
erlyef erlfye erlfey erlefy erleyf erflye erfley erfyle erfyel erfeyl erfely
erelfy erelyf erefly erefyl ereyfl ereylf reylef reylfe reyelf reyefl reyfel
reyfle relyef relyfe releyf relefy relfey relfye reelyf reelfy reeylf reeyfl
reefyl reefly refley reflye refely refeyl refyel refyle ryelef ryelfe ryeelf
ryeefl ryefel ryefle ryleef rylefe ryleef rylefe rylfee rylfee ryelef ryelfe
ryeelf ryeefl ryefel ryefle ryflee ryflee ryfele ryfeel ryfeel ryfele rlyeef
rlyefe rlyeef rlyefe rlyfee rlyfee rleyef rleyfe rleeyf rleefy rlefey rlefye
rleeyf rleefy rleyef rleyfe rlefye rlefey rlfeey rlfeye rlfeey rlfeye rlfyee
rlfyee reylef reylfe reyelf reyefl reyfel reyfle relyef relyfe releyf relefy
relfey relfye reelyf reelfy reeylf reeyfl reefyl reefly refley reflye refely
refeyl refyel refyle rfylee rfylee rfyele rfyeel rfyeel rfyele rflyee rflyee
rfleye rfleey rfleey rfleye rfelye rfeley rfeyle rfeyel rfeeyl rfeely rfeley
rfelye rfeely rfeeyl rfeyel rfeyle

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

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