easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

pyralidan

radically

iungerantque

emanuele

ambrogio

ciliation

sottage

bodkin

diagrammatically

depletory

flocker

progers

spottswood

phytoteratologist

reevaluating

unescapable

spiflicated

orasseque


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: scooby
cipher variations:
tdppcz ueqqda vfrreb wgssfc xhttgd
yiuuhe zjvvif akwwjg blxxkh cmyyli
dnzzmj eoaank fpbbol gqccpm hrddqn
iseero jtffsp kuggtq lvhhur mwiivs
nxjjwt oykkxu pzllyv qammzw rbnnax

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: scooby
Cipher: hxllyb

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: scooby
Cipher: BAAAB AAABA ABBAB ABBAB AAAAB BABBA

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: scooby
cipher variations:
tdppczdhrrevnlttgrxpvvinhtxxkjrxzzmflfddqxvjffst
fnhhupprjjwlzvllyhjznnadueqqdaeissfwomuuhsyqwwjo
iuyylksyaangmgeerywkggtugoiivqqskkxmawmmzikaoobe
vfrrebfjttgxpnvvitzrxxkpjvzzmltzbbohnhffszxlhhuv
hpjjwrrtllynbxnnajlbppcfwgssfcgkuuhyqowwjuasyylq
kwaanmuaccpioiggtaymiivwiqkkxssummzocyoobkmcqqdg
xhttgdhlvvizrpxxkvbtzzmrlxbbonvbddqjpjhhubznjjwx
jrllyttvnnapdzppclndrrehyiuuheimwwjasqyylwcuaans
myccpowceerkqkiivcaokkxyksmmzuuwoobqeaqqdmoessfi
zjvvifjnxxkbtrzzmxdvbbotnzddqpxdffslrljjwdbpllyz
ltnnavvxppcrfbrrenpfttgjakwwjgkoyylcusaanyewccpu
oaeerqyeggtmsmkkxecqmmzamuoobwwyqqdsgcssfoqguuhk
blxxkhlpzzmdvtbbozfxddqvpbffsrzfhhuntnllyfdrnnab
nvppcxxzrrethdttgprhvvilcmyylimqaanewuccpagyeerw
qcggtsagiivouommzgesoobcowqqdyyassfuieuuhqsiwwjm
dnzzmjnrbbofxvddqbhzffsxrdhhutbhjjwpvpnnahftppcd
pxrrezzbttgvjfvvirtjxxkneoaankosccpgyweerciaggty
seiivucikkxqwqoobiguqqdeqyssfaacuuhwkgwwjsukyylo
fpbbolptddqhzxffsdjbhhuztfjjwvdjllyrxrppcjhvrref
rzttgbbdvvixlhxxktvlzzmpgqccpmqueeriayggtekciiva
ugkkxwekmmzsysqqdkiwssfgsauuhccewwjymiyyluwmaanq
hrddqnrvffsjbzhhufldjjwbvhllyxflnnatztrreljxttgh
tbvviddfxxkznjzzmvxnbboriseeroswggtkcaiivgmekkxc
wimmzygmoobuaussfmkyuuhiucwwjeegyylaokaanwyoccps
jtffsptxhhuldbjjwhnfllydxjnnazhnppcvbvttgnlzvvij
vdxxkffhzzmbplbboxzpddqtkuggtquyiivmeckkxiogmmze
ykoobaioqqdwcwuuhomawwjkweyylggiaancqmccpyaqeeru
lvhhurvzjjwnfdllyjphnnafzlppcbjprrexdxvvipnbxxkl
xfzzmhhjbbodrnddqzbrffsvmwiivswakkxogemmzkqioobg
amqqdckqssfyeywwjqocyylmygaaniikccpesoeeracsggtw
nxjjwtxbllyphfnnalrjppchbnrredlrttgzfzxxkrpdzzmn
zhbbojjlddqftpffsbdthhuxoykkxuycmmzqigoobmskqqdi
cossfemsuuhagayylsqeaanoaiccpkkmeerguqggtceuiivy
pzllyvzdnnarjhppcntlrrejdpttgfntvvibhbzzmtrfbbop
bjddqllnffshvrhhudfvjjwzqammzwaeoobskiqqdoumssfk
equuhgouwwjcicaanusgccpqckeermmoggtiwsiivegwkkxa
rbnnaxbfppctljrrepvnttglfrvvihpvxxkdjdbbovthddqr
dlffsnnphhujxtjjwfhxllybscoobycgqqdumkssfqwouuhm
gswwjiqwyylekeccpwuieersemggtooqiivkyukkxgiymmzc

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: scooby
Cipher: fpbbol

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: scooby
Cipher: 343143432145

Extended Methods:
Method #1

Plaintext: scooby
method variations:
xhttgdcnyymihsddronxiiwt

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
s c o o b y 
3 3 4 4 2 4 
4 1 3 3 1 5 
They are then read out in rows:
334424413315
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: scooby
Cipher: ntrdnv

Read more ...
Method #3

Plaintext: scooby
method variations:
oqshqp qshqpo shqpoq
hqpoqs qpoqsh poqshq

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: scooby

all 720 cipher variations:
scooby scooyb scoboy scobyo scoybo scoyob scooby scooyb scoboy scobyo scoybo
scoyob scbooy scboyo scbooy scboyo scbyoo scbyoo scyobo scyoob scyboo scyboo
scyobo scyoob socoby socoyb socboy socbyo socybo socyob soocby soocyb soobcy
soobyc sooybc sooycb sobocy soboyc sobcoy sobcyo sobyco sobyoc soyobc soyocb
soyboc soybco soycbo soycob soocby soocyb soobcy soobyc sooybc sooycb socoby
socoyb socboy socbyo socybo socyob sobcoy sobcyo sobocy soboyc sobyoc sobyco
soycbo soycob soybco soyboc soyobc soyocb sboocy sbooyc sbocoy sbocyo sboyco
sboyoc sboocy sbooyc sbocoy sbocyo sboyco sboyoc sbcooy sbcoyo sbcooy sbcoyo
sbcyoo sbcyoo sbyoco sbyooc sbycoo sbycoo sbyoco sbyooc syoobc syoocb syoboc
syobco syocbo syocob syoobc syoocb syoboc syobco syocbo syocob sybooc syboco
sybooc syboco sybcoo sybcoo sycobo sycoob sycboo sycboo sycobo sycoob csooby
csooyb csoboy csobyo csoybo csoyob csooby csooyb csoboy csobyo csoybo csoyob
csbooy csboyo csbooy csboyo csbyoo csbyoo csyobo csyoob csyboo csyboo csyobo
csyoob cosoby cosoyb cosboy cosbyo cosybo cosyob coosby coosyb coobsy coobys
cooybs cooysb cobosy coboys cobsoy cobsyo cobyso cobyos coyobs coyosb coybos
coybso coysbo coysob coosby coosyb coobsy coobys cooybs cooysb cosoby cosoyb
cosboy cosbyo cosybo cosyob cobsoy cobsyo cobosy coboys cobyos cobyso coysbo
coysob coybso coybos coyobs coyosb cboosy cbooys cbosoy cbosyo cboyso cboyos
cboosy cbooys cbosoy cbosyo cboyso cboyos cbsooy cbsoyo cbsooy cbsoyo cbsyoo
cbsyoo cbyoso cbyoos cbysoo cbysoo cbyoso cbyoos cyoobs cyoosb cyobos cyobso
cyosbo cyosob cyoobs cyoosb cyobos cyobso cyosbo cyosob cyboos cyboso cyboos
cyboso cybsoo cybsoo cysobo cysoob cysboo cysboo cysobo cysoob ocsoby ocsoyb
ocsboy ocsbyo ocsybo ocsyob ocosby ocosyb ocobsy ocobys ocoybs ocoysb ocbosy
ocboys ocbsoy ocbsyo ocbyso ocbyos ocyobs ocyosb ocybos ocybso ocysbo ocysob
oscoby oscoyb oscboy oscbyo oscybo oscyob osocby osocyb osobcy osobyc osoybc
osoycb osbocy osboyc osbcoy osbcyo osbyco osbyoc osyobc osyocb osyboc osybco
osycbo osycob ooscby ooscyb oosbcy oosbyc oosybc oosycb oocsby oocsyb oocbsy
oocbys oocybs oocysb oobcsy oobcys oobscy oobsyc oobysc oobycs ooycbs ooycsb
ooybcs ooybsc ooysbc ooyscb obsocy obsoyc obscoy obscyo obsyco obsyoc oboscy
obosyc obocsy obocys oboycs oboysc obcosy obcoys obcsoy obcsyo obcyso obcyos
obyocs obyosc obycos obycso obysco obysoc oysobc oysocb oysboc oysbco oyscbo
oyscob oyosbc oyoscb oyobsc oyobcs oyocbs oyocsb oybosc oybocs oybsoc oybsco
oybcso oybcos oycobs oycosb oycbos oycbso oycsbo oycsob ocosby ocosyb ocobsy
ocobys ocoybs ocoysb ocsoby ocsoyb ocsboy ocsbyo ocsybo ocsyob ocbsoy ocbsyo
ocbosy ocboys ocbyos ocbyso ocysbo ocysob ocybso ocybos ocyobs ocyosb oocsby
oocsyb oocbsy oocbys oocybs oocysb ooscby ooscyb oosbcy oosbyc oosybc oosycb
oobscy oobsyc oobcsy oobcys oobycs oobysc ooysbc ooyscb ooybsc ooybcs ooycbs
ooycsb osocby osocyb osobcy osobyc osoybc osoycb oscoby oscoyb oscboy oscbyo
oscybo oscyob osbcoy osbcyo osbocy osboyc osbyoc osbyco osycbo osycob osybco
osyboc osyobc osyocb oboscy obosyc obocsy obocys oboycs oboysc obsocy obsoyc
obscoy obscyo obsyco obsyoc obcsoy obcsyo obcosy obcoys obcyos obcyso obysco
obysoc obycso obycos obyocs obyosc oyosbc oyoscb oyobsc oyobcs oyocbs oyocsb
oysobc oysocb oysboc oysbco oyscbo oyscob oybsoc oybsco oybosc oybocs oybcos
oybcso oycsbo oycsob oycbso oycbos oycobs oycosb bcoosy bcooys bcosoy bcosyo
bcoyso bcoyos bcoosy bcooys bcosoy bcosyo bcoyso bcoyos bcsooy bcsoyo bcsooy
bcsoyo bcsyoo bcsyoo bcyoso bcyoos bcysoo bcysoo bcyoso bcyoos bocosy bocoys
bocsoy bocsyo bocyso bocyos boocsy boocys booscy boosyc booysc booycs bosocy
bosoyc boscoy boscyo bosyco bosyoc boyosc boyocs boysoc boysco boycso boycos
boocsy boocys booscy boosyc booysc booycs bocosy bocoys bocsoy bocsyo bocyso
bocyos boscoy boscyo bosocy bosoyc bosyoc bosyco boycso boycos boysco boysoc
boyosc boyocs bsoocy bsooyc bsocoy bsocyo bsoyco bsoyoc bsoocy bsooyc bsocoy
bsocyo bsoyco bsoyoc bscooy bscoyo bscooy bscoyo bscyoo bscyoo bsyoco bsyooc
bsycoo bsycoo bsyoco bsyooc byoosc byoocs byosoc byosco byocso byocos byoosc
byoocs byosoc byosco byocso byocos bysooc bysoco bysooc bysoco byscoo byscoo
bycoso bycoos bycsoo bycsoo bycoso bycoos ycoobs ycoosb ycobos ycobso ycosbo
ycosob ycoobs ycoosb ycobos ycobso ycosbo ycosob ycboos ycboso ycboos ycboso
ycbsoo ycbsoo ycsobo ycsoob ycsboo ycsboo ycsobo ycsoob yocobs yocosb yocbos
yocbso yocsbo yocsob yoocbs yoocsb yoobcs yoobsc yoosbc yooscb yobocs yobosc
yobcos yobcso yobsco yobsoc yosobc yosocb yosboc yosbco yoscbo yoscob yoocbs
yoocsb yoobcs yoobsc yoosbc yooscb yocobs yocosb yocbos yocbso yocsbo yocsob
yobcos yobcso yobocs yobosc yobsoc yobsco yoscbo yoscob yosbco yosboc yosobc
yosocb yboocs yboosc ybocos ybocso ybosco ybosoc yboocs yboosc ybocos ybocso
ybosco ybosoc ybcoos ybcoso ybcoos ybcoso ybcsoo ybcsoo ybsoco ybsooc ybscoo
ybscoo ybsoco ybsooc ysoobc ysoocb ysoboc ysobco ysocbo ysocob ysoobc ysoocb
ysoboc ysobco ysocbo ysocob ysbooc ysboco ysbooc ysboco ysbcoo ysbcoo yscobo
yscoob yscboo yscboo yscobo yscoob

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

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