easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

circumundulation

scepterless

latchkeys

unevennesses

dokoupil

hypocenter

caedetur

prosimus

girouettism

inspissator

minstre

pegaso

cottom

immunogenicity

sokotri

avantgarde

chondral

aerothermoelasticity


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: sember
cipher variations:
tfncfs ugodgt vhpehu wiqfiv xjrgjw
ykshkx zltily amujmz bnvkna cowlob
dpxmpc eqynqd frzore gsapsf htbqtg
iucruh jvdsvi kwetwj lxfuxk mygvyl
nzhwzm oaixan pbjybo qckzcp rdladq

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: sember
Cipher: hvnyvi

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: sember
Cipher: BAAAB AABAA ABABB AAAAB 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: sember
cipher variations:
tfncfsdnlenanvjgvixdhidqhlfklyrtdmtgljzqjwvrxsre
fzvuzmphtwhuzprypcjxpaxkugodgteomfobowkhwjyeijer
imglmzsuenuhmkarkxwsytsfgawvanqiuxivaqszqdkyqbyl
vhpehufpngpcpxlixkzfjkfsjnhmnatvfovinlbslyxtzutg
hbxwborjvyjwbrtarelzrczmwiqfivgqohqdqymjylagklgt
koinobuwgpwjomctmzyuavuhicyxcpskwzkxcsubsfmasdan
xjrgjwhrpirerznkzmbhlmhulpjopcvxhqxkpndunazvbwvi
jdzydqtlxalydtvctgnbteboykshkxisqjsfsaolancimniv
mqkpqdwyirylqoevobawcxwjkeazerumybmzeuwduhocufcp
zltilyjtrktgtbpmbodjnojwnrlqrexzjszmrpfwpcbxdyxk
lfbafsvnzcnafvxevipdvgdqamujmzkusluhucqncpekopkx
osmrsfyaktansqgxqdcyezylmgcbgtwoadobgwyfwjqewher
bnvknalvtmvivdrodqflpqlyptnstgzblubotrhyredzfazm
nhdchuxpbepchxzgxkrfxifscowlobmwunwjwespergmqrmz
quotuhacmvcpusizsfeagbanoiedivyqcfqdiyahylsgyjgt
dpxmpcnxvoxkxftqfshnrsnarvpuvibdnwdqvtjatgfbhcbo
pjfejwzrdgrejzbizmthzkhueqynqdoywpylygurgtiostob
swqvwjceoxerwukbuhgcidcpqkgfkxasehsfkacjanuialiv
frzorepzxqzmzhvshujptupctxrwxkdfpyfsxvlcvihdjedq
rlhglybtfitglbdkbovjbmjwgsapsfqayranaiwtivkquvqd
uysxylegqzgtywmdwjiekfersmihmzcugjuhmcelcpwkcnkx
htbqtgrbzsbobjxujwlrvwrevztyzmfhrahuzxnexkjflgfs
tnjinadvhkvindfmdqxldolyiucruhscatcpckyvkxmswxsf
wauzangisbivayofylkgmhgtuokjobewilwjoegnerymepmz
jvdsvitdbudqdlzwlyntxytgxbvabohjtcjwbzpgzmlhnihu
vplkpcfxjmxkpfhofsznfqnakwetwjuecveremaxmzouyzuh
ycwbcpikudkxcaqhanmiojivwqmlqdgyknylqgipgtaogrob
lxfuxkvfdwfsfnbynapvzavizdxcdqjlvelydbribonjpkjw
xrnmrehzlozmrhjqhubphspcmygvylwgexgtgoczobqwabwj
aeyderkmwfmzecsjcpokqlkxysonsfiampansikrivcqitqd
nzhwzmxhfyhuhpdapcrxbcxkbfzefslnxgnafdtkdqplrmly
ztpotgjbnqbotjlsjwdrjureoaixanyigziviqebqdsycdyl
cgafgtmoyhobgeulerqmsnmzauqpuhkcorcpukmtkxeskvsf
pbjybozjhajwjrfcretzdezmdhbghunpzipchfvmfsrntona
bvrqvildpsdqvlnulyftlwtgqckzcpakibkxksgdsfuaefan
eichivoqajqdigwngtsoupobcwsrwjmeqterwmovmzgumxuh
rdladqbljclylthetgvbfgbofjdijwprbkrejhxohutpvqpc
dxtsxknfrufsxnpwnahvnyvisembercmkdmzmuifuhwcghcp
gkejkxqsclsfkiypivuqwrqdeyutylogsvgtyoqxobiwozwj

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: sember
Cipher: frzore

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: sember
Cipher: 345123215124

Extended Methods:
Method #1

Plaintext: sember
method variations:
xkrgkwcpwmpbhubrugnzgwzm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
s e m b e r 
3 5 2 2 5 2 
4 1 3 1 1 4 
They are then read out in rows:
352252413114
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: sember
Cipher: xgkdcq

Read more ...
Method #3

Plaintext: sember
method variations:
yfhvfo fhvfoy hvfoyf
vfoyfh foyfhv oyfhvf

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: sember

all 720 cipher variations:
sember sembre semebr semerb semreb semrbe sebmer sebmre sebemr seberm sebrem
sebrme seebmr seebrm seembr seemrb seermb seerbm serbem serbme serebm seremb
sermeb sermbe smeber smebre smeebr smeerb smereb smerbe smbeer smbere smbeer
smbere smbree smbree smeber smebre smeebr smeerb smereb smerbe smrbee smrbee
smrebe smreeb smreeb smrebe sbmeer sbmere sbmeer sbmere sbmree sbmree sbemer
sbemre sbeemr sbeerm sberem sberme sbeemr sbeerm sbemer sbemre sberme sberem
sbreem sbreme sbreem sbreme sbrmee sbrmee sember sembre semebr semerb semreb
semrbe sebmer sebmre sebemr seberm sebrem sebrme seebmr seebrm seembr seemrb
seermb seerbm serbem serbme serebm seremb sermeb sermbe srmbee srmbee srmebe
srmeeb srmeeb srmebe srbmee srbmee srbeme srbeem srbeem srbeme srebme srebem
srembe sremeb sreemb sreebm srebem srebme sreebm sreemb sremeb srembe esmber
esmbre esmebr esmerb esmreb esmrbe esbmer esbmre esbemr esberm esbrem esbrme
esebmr esebrm esembr esemrb esermb eserbm esrbem esrbme esrebm esremb esrmeb
esrmbe emsber emsbre emsebr emserb emsreb emsrbe embser embsre embesr embers
embres embrse emebsr emebrs emesbr emesrb emersb emerbs emrbes emrbse emrebs
emresb emrseb emrsbe ebmser ebmsre ebmesr ebmers ebmres ebmrse ebsmer ebsmre
ebsemr ebserm ebsrem ebsrme ebesmr ebesrm ebemsr ebemrs eberms ebersm ebrsem
ebrsme ebresm ebrems ebrmes ebrmse eembsr eembrs eemsbr eemsrb eemrsb eemrbs
eebmsr eebmrs eebsmr eebsrm eebrsm eebrms eesbmr eesbrm eesmbr eesmrb eesrmb
eesrbm eerbsm eerbms eersbm eersmb eermsb eermbs ermbes ermbse ermebs ermesb
ermseb ermsbe erbmes erbmse erbems erbesm erbsem erbsme erebms erebsm erembs
eremsb eresmb eresbm ersbem ersbme ersebm ersemb ersmeb ersmbe mesber mesbre
mesebr meserb mesreb mesrbe mebser mebsre mebesr mebers mebres mebrse meebsr
meebrs meesbr meesrb meersb meerbs merbes merbse merebs meresb merseb mersbe
mseber msebre mseebr mseerb msereb mserbe msbeer msbere msbeer msbere msbree
msbree mseber msebre mseebr mseerb msereb mserbe msrbee msrbee msrebe msreeb
msreeb msrebe mbseer mbsere mbseer mbsere mbsree mbsree mbeser mbesre mbeesr
mbeers mberes mberse mbeesr mbeers mbeser mbesre mberse mberes mbrees mbrese
mbrees mbrese mbrsee mbrsee mesber mesbre mesebr meserb mesreb mesrbe mebser
mebsre mebesr mebers mebres mebrse meebsr meebrs meesbr meesrb meersb meerbs
merbes merbse merebs meresb merseb mersbe mrsbee mrsbee mrsebe mrseeb mrseeb
mrsebe mrbsee mrbsee mrbese mrbees mrbees mrbese mrebse mrebes mresbe mreseb
mreesb mreebs mrebes mrebse mreebs mreesb mreseb mresbe bemser bemsre bemesr
bemers bemres bemrse besmer besmre besemr beserm besrem besrme beesmr beesrm
beemsr beemrs beerms beersm bersem bersme beresm berems bermes bermse bmeser
bmesre bmeesr bmeers bmeres bmerse bmseer bmsere bmseer bmsere bmsree bmsree
bmeser bmesre bmeesr bmeers bmeres bmerse bmrsee bmrsee bmrese bmrees bmrees
bmrese bsmeer bsmere bsmeer bsmere bsmree bsmree bsemer bsemre bseemr bseerm
bserem bserme bseemr bseerm bsemer bsemre bserme bserem bsreem bsreme bsreem
bsreme bsrmee bsrmee bemser bemsre bemesr bemers bemres bemrse besmer besmre
besemr beserm besrem besrme beesmr beesrm beemsr beemrs beerms beersm bersem
bersme beresm berems bermes bermse brmsee brmsee brmese brmees brmees brmese
brsmee brsmee brseme brseem brseem brseme bresme bresem bremse bremes breems
breesm bresem bresme breesm breems bremes bremse eembsr eembrs eemsbr eemsrb
eemrsb eemrbs eebmsr eebmrs eebsmr eebsrm eebrsm eebrms eesbmr eesbrm eesmbr
eesmrb eesrmb eesrbm eerbsm eerbms eersbm eersmb eermsb eermbs emebsr emebrs
emesbr emesrb emersb emerbs embesr embers embser embsre embrse embres emsber
emsbre emsebr emserb emsreb emsrbe emrbse emrbes emrsbe emrseb emresb emrebs
ebmesr ebmers ebmser ebmsre ebmrse ebmres ebemsr ebemrs ebesmr ebesrm ebersm
eberms ebsemr ebserm ebsmer ebsmre ebsrme ebsrem ebresm ebrems ebrsem ebrsme
ebrmse ebrmes esmber esmbre esmebr esmerb esmreb esmrbe esbmer esbmre esbemr
esberm esbrem esbrme esebmr esebrm esembr esemrb esermb eserbm esrbem esrbme
esrebm esremb esrmeb esrmbe ermbse ermbes ermsbe ermseb ermesb ermebs erbmse
erbmes erbsme erbsem erbesm erbems ersbme ersbem ersmbe ersmeb ersemb ersebm
erebsm erebms eresbm eresmb eremsb erembs rembes rembse remebs remesb remseb
remsbe rebmes rebmse rebems rebesm rebsem rebsme reebms reebsm reembs reemsb
reesmb reesbm resbem resbme resebm resemb resmeb resmbe rmebes rmebse rmeebs
rmeesb rmeseb rmesbe rmbees rmbese rmbees rmbese rmbsee rmbsee rmebes rmebse
rmeebs rmeesb rmeseb rmesbe rmsbee rmsbee rmsebe rmseeb rmseeb rmsebe rbmees
rbmese rbmees rbmese rbmsee rbmsee rbemes rbemse rbeems rbeesm rbesem rbesme
rbeems rbeesm rbemes rbemse rbesme rbesem rbseem rbseme rbseem rbseme rbsmee
rbsmee rembes rembse remebs remesb remseb remsbe rebmes rebmse rebems rebesm
rebsem rebsme reebms reebsm reembs reemsb reesmb reesbm resbem resbme resebm
resemb resmeb resmbe rsmbee rsmbee rsmebe rsmeeb rsmeeb rsmebe rsbmee rsbmee
rsbeme rsbeem rsbeem rsbeme rsebme rsebem rsembe rsemeb rseemb rseebm rsebem
rsebme rseebm rseemb rsemeb rsembe

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

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