easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

caracaras

fremisque

invalidhood

causality

amies

indigofera

unmailed

whemmel

khamdy

unembowered

haberman

fergusonite

nitentum

thermoresistibile

jackstraws

celeriac

tyrannosaurs

inulinus


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: beaked
cipher variations:
cfblfe dgcmgf ehdnhg fieoih gjfpji
hkgqkj ilhrlk jmisml knjtnm lokuon
mplvpo nqmwqp ornxrq psoysr qtpzts
ruqaut svrbvu twscwv uxtdxw vyueyx
wzvfzy xawgaz ybxhba zcyicb adzjdc

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: beaked
Cipher: yvzpvw

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: beaked
Cipher: AAAAB AABAA AAAAA ABAAB AABAA AAABB

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: beaked
cipher variations:
cfblfeenbfnkgvbzvqidbtdwklbnlcmtbhtiqjbvjusrbpra
uzbjzgwhbdhmypbxpsaxbrxydgcmgffocgolhwcawrjecuex
lmcomdnuciujrkcwkvtscqsbvackahxiceinzqcyqtbycsyz
ehdnhggpdhpmixdbxskfdvfymndpneovdjvksldxlwutdrtc
wbdlbiyjdfjoardzruczdtzafieoihhqeiqnjyecytlgewgz
noeqofpwekwltmeymxvuesudxcemcjzkegkpbseasvdaeuab
gjfpjiirfjrokzfdzumhfxhaopfrpgqxflxmunfznywvftve
ydfndkalfhlqctfbtwebfvbchkgqkjjsgksplageavnigyib
pqgsqhrygmynvogaozxwguwfzegoelbmgimrdugcuxfcgwcd
ilhrlkkthltqmbhfbwojhzjcqrhtriszhnzowphbpayxhvxg
afhpfmcnhjnsevhdvygdhxdejmismlluimurncigcxpkiakd
rsiusjtaioapxqicqbzyiwyhbgiqgndoikotfwiewzheiyef
knjtnmmvjnvsodjhdyqljblestjvtkubjpbqyrjdrcazjxzi
chjrhoepjlpugxjfxaifjzfglokuonnwkowtpekiezrmkcmf
tukwulvckqcrzskesdbakyajdiksipfqkmqvhykgybjgkagh
mplvpooxlpxuqfljfasnldnguvlxvmwdlrdsatlftecblzbk
ejltjqgrlnrwizlhzckhlbhinqmwqppymqyvrgmkgbtomeoh
vwmywnxemsetbumgufdcmaclfkmukrhsmosxjamiadlimcij
ornxrqqznrzwshnlhcupnfpiwxnzxoyfntfucvnhvgednbdm
glnvlsitnptykbnjbemjndjkpsoysrraosaxtiomidvqogqj
xyoaypzgougvdwoiwhfeocenhmowmtjuoquzlcokcfnkoekl
qtpztssbptbyujpnjewrphrkyzpbzqahpvhwexpjxigfpdfo
inpxnukvprvamdpldgolpflmruqauttcquczvkqokfxsqisl
zaqcarbiqwixfyqkyjhgqegpjoqyovlwqswbneqmehpmqgmn
svrbvuudrvdawlrplgytrjtmabrdbscjrxjygzrlzkihrfhq
kprzpwmxrtxcofrnfiqnrhnotwscwvveswebxmsqmhzuskun
bcsectdksykzhasmaljisgirlqsaqxnysuydpgsogjrosiop
uxtdxwwftxfcyntrniavtlvocdtfdueltzlaibtnbmkjthjs
mrtbryoztvzeqhtphksptjpqvyueyxxguygdzousojbwumwp
deugevfmuambjcuocnlkuiktnsucszpauwafriuqiltqukqr
wzvfzyyhvzheapvtpkcxvnxqefvhfwgnvbnckdvpdomlvjlu
otvdtaqbvxbgsjvrjmurvlrsxawgazziwaifbqwuqldywoyr
fgwigxhowcodlewqepnmwkmvpuweubrcwychtkwsknvswmst
ybxhbaajxbjgcrxvrmezxpzsghxjhyipxdpemfxrfqonxlnw
qvxfvcsdxzdiulxtlowtxntuzcyicbbkyckhdsywsnfayqat
hiykizjqyeqfngysgrpoymoxrwygwdteyaejvmyumpxuyouv
adzjdcclzdlietzxtogbzrbuijzljakrzfrgohzthsqpznpy
sxzhxeufzbfkwnzvnqyvzpvwbeakeddmaemjfuayuphcascv
jkamkblsagshpiauitrqaoqztyaiyfvgacglxoaworzwaqwx

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: beaked
Cipher: ornxrq

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: beaked
Cipher: 215111525141

Extended Methods:
Method #1

Plaintext: beaked
method variations:
gkfpkimpluporuqzutwzvezy

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
b e a k e d 
2 5 1 5 5 4 
1 1 1 2 1 1 
They are then read out in rows:
251554111211
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: beaked
Cipher: wvuafa

Read more ...
Method #3

Plaintext: beaked
method variations:
vavwqf avwqfv vwqfva
wqfvav qfvavw fvavwq

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: beaked

all 720 cipher variations:
beaked beakde beaekd beaedk beadek beadke bekaed bekade bekead bekeda bekdea
bekdae beekad beekda beeakd beeadk beedak beedka bedkea bedkae bedeka bedeak
bedaek bedake baeked baekde baeekd baeedk baedek baedke bakeed bakede bakeed
bakede bakdee bakdee baeked baekde baeekd baeedk baedek baedke badkee badkee
badeke badeek badeek badeke bkaeed bkaede bkaeed bkaede bkadee bkadee bkeaed
bkeade bkeead bkeeda bkedea bkedae bkeead bkeeda bkeaed bkeade bkedae bkedea
bkdeea bkdeae bkdeea bkdeae bkdaee bkdaee beaked beakde beaekd beaedk beadek
beadke bekaed bekade bekead bekeda bekdea bekdae beekad beekda beeakd beeadk
beedak beedka bedkea bedkae bedeka bedeak bedaek bedake bdakee bdakee bdaeke
bdaeek bdaeek bdaeke bdkaee bdkaee bdkeae bdkeea bdkeea bdkeae bdekae bdekea
bdeake bdeaek bdeeak bdeeka bdekea bdekae bdeeka bdeeak bdeaek bdeake ebaked
ebakde ebaekd ebaedk ebadek ebadke ebkaed ebkade ebkead ebkeda ebkdea ebkdae
ebekad ebekda ebeakd ebeadk ebedak ebedka ebdkea ebdkae ebdeka ebdeak ebdaek
ebdake eabked eabkde eabekd eabedk eabdek eabdke eakbed eakbde eakebd eakedb
eakdeb eakdbe eaekbd eaekdb eaebkd eaebdk eaedbk eaedkb eadkeb eadkbe eadekb
eadebk eadbek eadbke ekabed ekabde ekaebd ekaedb ekadeb ekadbe ekbaed ekbade
ekbead ekbeda ekbdea ekbdae ekebad ekebda ekeabd ekeadb ekedab ekedba ekdbea
ekdbae ekdeba ekdeab ekdaeb ekdabe eeakbd eeakdb eeabkd eeabdk eeadbk eeadkb
eekabd eekadb eekbad eekbda eekdba eekdab eebkad eebkda eebakd eebadk eebdak
eebdka eedkba eedkab eedbka eedbak eedabk eedakb edakeb edakbe edaekb edaebk
edabek edabke edkaeb edkabe edkeab edkeba edkbea edkbae edekab edekba edeakb
edeabk edebak edebka edbkea edbkae edbeka edbeak edbaek edbake aebked aebkde
aebekd aebedk aebdek aebdke aekbed aekbde aekebd aekedb aekdeb aekdbe aeekbd
aeekdb aeebkd aeebdk aeedbk aeedkb aedkeb aedkbe aedekb aedebk aedbek aedbke
abeked abekde abeekd abeedk abedek abedke abkeed abkede abkeed abkede abkdee
abkdee abeked abekde abeekd abeedk abedek abedke abdkee abdkee abdeke abdeek
abdeek abdeke akbeed akbede akbeed akbede akbdee akbdee akebed akebde akeebd
akeedb akedeb akedbe akeebd akeedb akebed akebde akedbe akedeb akdeeb akdebe
akdeeb akdebe akdbee akdbee aebked aebkde aebekd aebedk aebdek aebdke aekbed
aekbde aekebd aekedb aekdeb aekdbe aeekbd aeekdb aeebkd aeebdk aeedbk aeedkb
aedkeb aedkbe aedekb aedebk aedbek aedbke adbkee adbkee adbeke adbeek adbeek
adbeke adkbee adkbee adkebe adkeeb adkeeb adkebe adekbe adekeb adebke adebek
adeebk adeekb adekeb adekbe adeekb adeebk adebek adebke keabed keabde keaebd
keaedb keadeb keadbe kebaed kebade kebead kebeda kebdea kebdae keebad keebda
keeabd keeadb keedab keedba kedbea kedbae kedeba kedeab kedaeb kedabe kaebed
kaebde kaeebd kaeedb kaedeb kaedbe kabeed kabede kabeed kabede kabdee kabdee
kaebed kaebde kaeebd kaeedb kaedeb kaedbe kadbee kadbee kadebe kadeeb kadeeb
kadebe kbaeed kbaede kbaeed kbaede kbadee kbadee kbeaed kbeade kbeead kbeeda
kbedea kbedae kbeead kbeeda kbeaed kbeade kbedae kbedea kbdeea kbdeae kbdeea
kbdeae kbdaee kbdaee keabed keabde keaebd keaedb keadeb keadbe kebaed kebade
kebead kebeda kebdea kebdae keebad keebda keeabd keeadb keedab keedba kedbea
kedbae kedeba kedeab kedaeb kedabe kdabee kdabee kdaebe kdaeeb kdaeeb kdaebe
kdbaee kdbaee kdbeae kdbeea kdbeea kdbeae kdebae kdebea kdeabe kdeaeb kdeeab
kdeeba kdebea kdebae kdeeba kdeeab kdeaeb kdeabe eeakbd eeakdb eeabkd eeabdk
eeadbk eeadkb eekabd eekadb eekbad eekbda eekdba eekdab eebkad eebkda eebakd
eebadk eebdak eebdka eedkba eedkab eedbka eedbak eedabk eedakb eaekbd eaekdb
eaebkd eaebdk eaedbk eaedkb eakebd eakedb eakbed eakbde eakdbe eakdeb eabked
eabkde eabekd eabedk eabdek eabdke eadkbe eadkeb eadbke eadbek eadebk eadekb
ekaebd ekaedb ekabed ekabde ekadbe ekadeb ekeabd ekeadb ekebad ekebda ekedba
ekedab ekbead ekbeda ekbaed ekbade ekbdae ekbdea ekdeba ekdeab ekdbea ekdbae
ekdabe ekdaeb ebaked ebakde ebaekd ebaedk ebadek ebadke ebkaed ebkade ebkead
ebkeda ebkdea ebkdae ebekad ebekda ebeakd ebeadk ebedak ebedka ebdkea ebdkae
ebdeka ebdeak ebdaek ebdake edakbe edakeb edabke edabek edaebk edaekb edkabe
edkaeb edkbae edkbea edkeba edkeab edbkae edbkea edbake edbaek edbeak edbeka
edekba edekab edebka edebak edeabk edeakb deakeb deakbe deaekb deaebk deabek
deabke dekaeb dekabe dekeab dekeba dekbea dekbae deekab deekba deeakb deeabk
deebak deebka debkea debkae debeka debeak debaek debake daekeb daekbe daeekb
daeebk daebek daebke dakeeb dakebe dakeeb dakebe dakbee dakbee daekeb daekbe
daeekb daeebk daebek daebke dabkee dabkee dabeke dabeek dabeek dabeke dkaeeb
dkaebe dkaeeb dkaebe dkabee dkabee dkeaeb dkeabe dkeeab dkeeba dkebea dkebae
dkeeab dkeeba dkeaeb dkeabe dkebae dkebea dkbeea dkbeae dkbeea dkbeae dkbaee
dkbaee deakeb deakbe deaekb deaebk deabek deabke dekaeb dekabe dekeab dekeba
dekbea dekbae deekab deekba deeakb deeabk deebak deebka debkea debkae debeka
debeak debaek debake dbakee dbakee dbaeke dbaeek dbaeek dbaeke dbkaee dbkaee
dbkeae dbkeea dbkeea dbkeae dbekae dbekea dbeake dbeaek dbeeak dbeeka dbekea
dbekae dbeeka dbeeak dbeaek dbeake

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

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