easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

stetitque

ludibrious

heliconiidae

postepileptic

guadelupe

dulness

devaul

pessimistically

raveners

uncoerced

levati

rought

hotwired

kornblum

pieterson

hoplites

macmullen

nonconstraint


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: tweez
cipher variations:
uxffa vyggb wzhhc xaiid ybjje
zckkf adllg bemmh cfnni dgooj
ehppk fiqql gjrrm hkssn iltto
jmuup knvvq lowwr mpxxs nqyyt
orzzu psaav qtbbw ruccx svddy

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: tweez
Cipher: gdvva

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: tweez
Cipher: BAABA BABAA AABAA AABAA BABBB

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: tweez
cipher variations:
uxffagpnnyshvvwezdduqrllscjttqatjjmmlrrk
ydzzikvhhgwnppeifxxcvyggbhqooztiwwxfaeev
rsmmtdkuurbukknnmsslzeaajlwiihxoqqfjgyyd
wzhhcirppaujxxygbffwstnnuelvvscvlloonttm
afbbkmxjjiyprrgkhzzexaiidjsqqbvkyyzhcggx
tuoovfmwwtdwmmppouunbgcclnykkjzqsshliaaf
ybjjektrrcwlzzaidhhyuvppwgnxxuexnnqqpvvo
chddmozllkarttimjbbgzckkflussdxmaabjeiiz
vwqqxhoyyvfyoorrqwwpdieenpammlbsuujnkcch
adllgmvtteynbbckfjjawxrryipzzwgzppssrxxq
ejffoqbnnmctvvkolddibemmhnwuufzoccdlgkkb
xysszjqaaxhaqqttsyyrfkggprcoonduwwlpmeej
cfnnioxvvgapddemhllcyzttakrbbyibrruutzzs
glhhqsdppoevxxmqnffkdgoojpywwhbqeefnimmd
zauublscczjcssvvuaathmiirteqqpfwyynroggl
ehppkqzxxicrffgojnneabvvcmtddakdttwwvbbu
injjsufrrqgxzzosphhmfiqqlrayyjdsgghpkoof
bcwwdnueebleuuxxwccvjokktvgssrhyaaptqiin
gjrrmsbzzkethhiqlppgcdxxeovffcmfvvyyxddw
kplluwhttsizbbqurjjohkssntcaalfuiijrmqqh
deyyfpwggdngwwzzyeexlqmmvxiuutjaccrvskkp
ilttoudbbmgvjjksnrriefzzgqxhheohxxaazffy
mrnnwyjvvukbddswtllqjmuupveccnhwkkltossj
fgaahryiifpiyybbaggznsooxzkwwvlceetxummr
knvvqwfddoixllmupttkghbbiszjjgqjzzccbhha
otppyalxxwmdffuyvnnslowwrxgeepjymmnvquul
hiccjtakkhrkaaddciibpuqqzbmyyxneggvzwoot
mpxxsyhffqkznnowrvvmijddkubllislbbeedjjc
qvrracnzzyofhhwaxppunqyytziggrlaoopxswwn
jkeelvcmmjtmccffekkdrwssbdoaazpgiixbyqqv
orzzuajhhsmbppqytxxoklffmwdnnkunddggflle
sxttcepbbaqhjjyczrrwpsaavbkiitncqqrzuyyp
lmggnxeoolvoeehhgmmftyuudfqccbrikkzdassx
qtbbwcljjuodrrsavzzqmnhhoyfppmwpffiihnng
uzvvegrddcsjllaebttyruccxdmkkvpesstbwaar
noiipzgqqnxqggjjioohvawwfhseedtkmmbfcuuz
svddyenllwqfttucxbbsopjjqahrroyrhhkkjppi
wbxxgitffeulnncgdvvatweezfommxrguuvdycct
pqkkrbisspzsiillkqqjxcyyhjuggfvmoodhewwb

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: tweez
Cipher: gjrrm

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: tweez
Cipher: 4425515155

Extended Methods:
Method #1

Plaintext: tweez
method variations:
ybkkedgppkimuuporzzu

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
t w e e z 
4 2 5 5 5 
4 5 1 1 5 
They are then read out in rows:
4255545115
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: tweez
Cipher: izuev

Read more ...
Method #3

Plaintext: tweez
method variations:
izvvu zvvui vvuiz
vuizv uizvv

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: tweez

all 120 cipher variations:
tweez tweze tweez tweze twzee twzee tewez tewze teewz teezw tezew
tezwe teewz teezw tewez tewze tezwe tezew tzeew tzewe tzeew tzewe
tzwee tzwee wteez wteze wteez wteze wtzee wtzee wetez wetze weetz
weezt wezet wezte weetz weezt wetez wetze wezte wezet wzeet wzete
wzeet wzete wztee wztee ewtez ewtze ewetz ewezt ewzet ewzte etwez
etwze etewz etezw etzew etzwe eetwz eetzw eewtz eewzt eezwt eeztw
eztew eztwe ezetw ezewt ezwet ezwte ewetz ewezt ewtez ewtze ewzte
ewzet eewtz eewzt eetwz eetzw eeztw eezwt etewz etezw etwez etwze
etzwe etzew ezetw ezewt eztew eztwe ezwte ezwet zweet zwete zweet
zwete zwtee zwtee zewet zewte zeewt zeetw zetew zetwe zeewt zeetw
zewet zewte zetwe zetew zteew ztewe zteew ztewe ztwee ztwee

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

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