easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

heisuke

exspectare

catenaformis

basalt

magians

uidereturque

exorti

whimmy

quove

fendant

simplon

paranuclear

schanberg

hashimoto

enrooting

unaffirmation

choledochoplasty

archaist


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: waldow
cipher variations:
xbmepx ycnfqy zdogrz aephsa bfqitb
cgrjuc dhskvd eitlwe fjumxf gkvnyg
hlwozh imxpai jnyqbj kozrck lpasdl
mqbtem nrcufn osdvgo ptewhp qufxiq
rvgyjr swhzks txialt uyjbmu vzkcnv

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: waldow
Cipher: dzowld

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: waldow
Cipher: BABAA AAAAA ABABA AAABB ABBAB BABAA

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: waldow
cipher variations:
xbmepxpbikrphbeqthzbawvzrbwcxrjbsizjtbkudtlbgafl
dbcghdvbymjvnbuslnfbqynfycnfqyqcjlsqicfruiacbxwa
scxdyskctjakuclveumchbgmecdhiewcznkwocvtmogcrzog
zdogrzrdkmtrjdgsvjbdcyxbtdyeztldukblvdmwfvndichn
fdeijfxdaolxpdwunphdsaphaephsaselnuskehtwkcedzyc
uezfaumevlcmwenxgwoejdiogefjkgyebpmyqexvoqietbqi
bfqitbtfmovtlfiuxldfeazdvfagbvnfwmdnxfoyhxpfkejp
hfgklhzfcqnzrfywprjfucrjcgrjucugnpwumgjvymegfbae
wgbhcwogxneoygpziyqglfkqighlmiagdroasgzxqskgvdsk
dhskvdvhoqxvnhkwznfhgcbfxhcidxphyofpzhqajzrhmglr
jhimnjbhespbthayrtlhwetleitlwewiprywoilxaogihdcg
yidjeyqizpgqairbkasinhmskijnokciftqcuibzsumixfum
fjumxfxjqszxpjmybphjiedhzjekfzrjaqhrbjsclbtjoint
ljkopldjgurdvjcatvnjygvngkvnygykrtayqknzcqikjfei
akflgaskbriscktdmcukpjoumklpqmekhvsewkdbuwokzhwo
hlwozhzlsubzrloadrjlkgfjblgmhbtlcsjtdluendvlqkpv
nlmqrnfliwtfxlecvxplaixpimxpaiamtvcasmpbeskmlhgk
cmhnicumdtkuemvfoewmrlqwomnrsogmjxugymfdwyqmbjyq
jnyqbjbnuwdbtnqcftlnmihldniojdvneulvfnwgpfxnsmrx
pnostphnkyvhzngexzrnckzrkozrckcovxecuordgumonjim
eojpkewofvmwgoxhqgyotnsyqoptuqiolzwiaohfyasodlas
lpasdldpwyfdvpsehvnpokjnfpkqlfxpgwnxhpyirhzpuotz
rpquvrjpmaxjbpigzbtpembtmqbtemeqxzgewqtfiwoqplko
gqlrmgyqhxoyiqzjsiaqvpuasqrvwskqnbykcqjhacuqfncu
nrcufnfryahfxrugjxprqmlphrmsnhzriypzjraktjbrwqvb
trswxtlroczldrkibdvrgodvosdvgogszbigysvhkyqsrnmq
isntoiasjzqaksblukcsxrwcustxyumspdamesljcewshpew
ptewhphtacjhztwilzrtsonrjtoupjbtkarbltcmvldtysxd
vtuyzvntqebnftmkdfxtiqfxqufxiqiubdkiauxjmasutpos
kupvqkculbscmudnwmeuztyewuvzawourfcogunlegyujrgy
rvgyjrjvceljbvyknbtvuqptlvqwrldvmctdnveoxnfvauzf
xvwabxpvsgdphvomfhzvkshzswhzkskwdfmkcwzlocuwvrqu
mwrxsmewndueowfpyogwbvagywxbcyqwtheqiwpngiawltia
txialtlxegnldxampdvxwsrvnxsytnfxoevfpxgqzphxcwbh
zxycdzrxuifrjxqohjbxmujbuyjbmumyfhomeybnqewyxtsw
oytzuogypfwgqyhraqiydxciayzdeasyvjgskyrpikcynvkc
vzkcnvnzgipnfzcorfxzyutxpzuavphzqgxhrzisbrjzeydj
bzaefbtzwkhtlzsqjldzowldwaldowoahjqogadpsgyazvuy
qavbwqiarhyisajtcskafzekcabfgcuaxliumatrkmeapxme

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: waldow
Cipher: jnyqbj

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: waldow
Cipher: 251113414325

Extended Methods:
Method #1

Plaintext: waldow
method variations:
bfqitbglvoygmqatdmrvfyir

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
w a l d o w 
2 1 1 4 4 2 
5 1 3 1 3 5 
They are then read out in rows:
211442513135
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: waldow
Cipher: bqiecx

Read more ...
Method #3

Plaintext: waldow
method variations:
easqhk asqhke sqhkea
qhkeas hkeasq keasqh

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: waldow

all 720 cipher variations:
waldow waldwo walodw walowd walwod walwdo wadlow wadlwo wadolw wadowl wadwol
wadwlo waodlw waodwl waoldw waolwd waowld waowdl wawdol wawdlo wawodl wawold
wawlod wawldo wladow wladwo wlaodw wlaowd wlawod wlawdo wldaow wldawo wldoaw
wldowa wldwoa wldwao wlodaw wlodwa wloadw wloawd wlowad wlowda wlwdoa wlwdao
wlwoda wlwoad wlwaod wlwado wdlaow wdlawo wdloaw wdlowa wdlwoa wdlwao wdalow
wdalwo wdaolw wdaowl wdawol wdawlo wdoalw wdoawl wdolaw wdolwa wdowla wdowal
wdwaol wdwalo wdwoal wdwola wdwloa wdwlao woldaw woldwa woladw wolawd wolwad
wolwda wodlaw wodlwa wodalw wodawl wodwal wodwla woadlw woadwl woaldw woalwd
woawld woawdl wowdal wowdla wowadl wowald wowlad wowlda wwldoa wwldao wwloda
wwload wwlaod wwlado wwdloa wwdlao wwdola wwdoal wwdaol wwdalo wwodla wwodal
wwolda wwolad wwoald wwoadl wwadol wwadlo wwaodl wwaold wwalod wwaldo awldow
awldwo awlodw awlowd awlwod awlwdo awdlow awdlwo awdolw awdowl awdwol awdwlo
awodlw awodwl awoldw awolwd awowld awowdl awwdol awwdlo awwodl awwold awwlod
awwldo alwdow alwdwo alwodw alwowd alwwod alwwdo aldwow aldwwo aldoww aldoww
aldwow aldwwo alodww alodww alowdw alowwd alowwd alowdw alwdow alwdwo alwodw
alwowd alwwod alwwdo adlwow adlwwo adloww adloww adlwow adlwwo adwlow adwlwo
adwolw adwowl adwwol adwwlo adowlw adowwl adolww adolww adowlw adowwl adwwol
adwwlo adwowl adwolw adwlow adwlwo aoldww aoldww aolwdw aolwwd aolwwd aolwdw
aodlww aodlww aodwlw aodwwl aodwwl aodwlw aowdlw aowdwl aowldw aowlwd aowwld
aowwdl aowdwl aowdlw aowwdl aowwld aowlwd aowldw awldow awldwo awlodw awlowd
awlwod awlwdo awdlow awdlwo awdolw awdowl awdwol awdwlo awodlw awodwl awoldw
awolwd awowld awowdl awwdol awwdlo awwodl awwold awwlod awwldo lawdow lawdwo
lawodw lawowd lawwod lawwdo ladwow ladwwo ladoww ladoww ladwow ladwwo laodww
laodww laowdw laowwd laowwd laowdw lawdow lawdwo lawodw lawowd lawwod lawwdo
lwadow lwadwo lwaodw lwaowd lwawod lwawdo lwdaow lwdawo lwdoaw lwdowa lwdwoa
lwdwao lwodaw lwodwa lwoadw lwoawd lwowad lwowda lwwdoa lwwdao lwwoda lwwoad
lwwaod lwwado ldwaow ldwawo ldwoaw ldwowa ldwwoa ldwwao ldawow ldawwo ldaoww
ldaoww ldawow ldawwo ldoaww ldoaww ldowaw ldowwa ldowwa ldowaw ldwaow ldwawo
ldwoaw ldwowa ldwwoa ldwwao lowdaw lowdwa lowadw lowawd lowwad lowwda lodwaw
lodwwa lodaww lodaww lodwaw lodwwa loadww loadww loawdw loawwd loawwd loawdw
lowdaw lowdwa lowadw lowawd lowwad lowwda lwwdoa lwwdao lwwoda lwwoad lwwaod
lwwado lwdwoa lwdwao lwdowa lwdoaw lwdaow lwdawo lwodwa lwodaw lwowda lwowad
lwoawd lwoadw lwadow lwadwo lwaodw lwaowd lwawod lwawdo dalwow dalwwo daloww
daloww dalwow dalwwo dawlow dawlwo dawolw dawowl dawwol dawwlo daowlw daowwl
daolww daolww daowlw daowwl dawwol dawwlo dawowl dawolw dawlow dawlwo dlawow
dlawwo dlaoww dlaoww dlawow dlawwo dlwaow dlwawo dlwoaw dlwowa dlwwoa dlwwao
dlowaw dlowwa dloaww dloaww dlowaw dlowwa dlwwoa dlwwao dlwowa dlwoaw dlwaow
dlwawo dwlaow dwlawo dwloaw dwlowa dwlwoa dwlwao dwalow dwalwo dwaolw dwaowl
dwawol dwawlo dwoalw dwoawl dwolaw dwolwa dwowla dwowal dwwaol dwwalo dwwoal
dwwola dwwloa dwwlao dolwaw dolwwa dolaww dolaww dolwaw dolwwa dowlaw dowlwa
dowalw dowawl dowwal dowwla doawlw doawwl doalww doalww doawlw doawwl dowwal
dowwla dowawl dowalw dowlaw dowlwa dwlwoa dwlwao dwlowa dwloaw dwlaow dwlawo
dwwloa dwwlao dwwola dwwoal dwwaol dwwalo dwowla dwowal dwolwa dwolaw dwoalw
dwoawl dwawol dwawlo dwaowl dwaolw dwalow dwalwo oaldww oaldww oalwdw oalwwd
oalwwd oalwdw oadlww oadlww oadwlw oadwwl oadwwl oadwlw oawdlw oawdwl oawldw
oawlwd oawwld oawwdl oawdwl oawdlw oawwdl oawwld oawlwd oawldw oladww oladww
olawdw olawwd olawwd olawdw oldaww oldaww oldwaw oldwwa oldwwa oldwaw olwdaw
olwdwa olwadw olwawd olwwad olwwda olwdwa olwdaw olwwda olwwad olwawd olwadw
odlaww odlaww odlwaw odlwwa odlwwa odlwaw odalww odalww odawlw odawwl odawwl
odawlw odwalw odwawl odwlaw odwlwa odwwla odwwal odwawl odwalw odwwal odwwla
odwlwa odwlaw owldaw owldwa owladw owlawd owlwad owlwda owdlaw owdlwa owdalw
owdawl owdwal owdwla owadlw owadwl owaldw owalwd owawld owawdl owwdal owwdla
owwadl owwald owwlad owwlda owldwa owldaw owlwda owlwad owlawd owladw owdlwa
owdlaw owdwla owdwal owdawl owdalw owwdla owwdal owwlda owwlad owwald owwadl
owadwl owadlw owawdl owawld owalwd owaldw waldow waldwo walodw walowd walwod
walwdo wadlow wadlwo wadolw wadowl wadwol wadwlo waodlw waodwl waoldw waolwd
waowld waowdl wawdol wawdlo wawodl wawold wawlod wawldo wladow wladwo wlaodw
wlaowd wlawod wlawdo wldaow wldawo wldoaw wldowa wldwoa wldwao wlodaw wlodwa
wloadw wloawd wlowad wlowda wlwdoa wlwdao wlwoda wlwoad wlwaod wlwado wdlaow
wdlawo wdloaw wdlowa wdlwoa wdlwao wdalow wdalwo wdaolw wdaowl wdawol wdawlo
wdoalw wdoawl wdolaw wdolwa wdowla wdowal wdwaol wdwalo wdwoal wdwola wdwloa
wdwlao woldaw woldwa woladw wolawd wolwad wolwda wodlaw wodlwa wodalw wodawl
wodwal wodwla woadlw woadwl woaldw woalwd woawld woawdl wowdal wowdla wowadl
wowald wowlad wowlda wwldoa wwldao wwloda wwload wwlaod wwlado wwdloa wwdlao
wwdola wwdoal wwdaol wwdalo wwodla wwodal wwolda wwolad wwoald wwoadl wwadol
wwadlo wwaodl wwaold wwalod wwaldo

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

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