easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

superne

trepidity

vilipender

instaveramusque

retailored

vagabitur

mullocker

astroalchemist

adibant

grasbeck

frieling

traversals

gruntz

pixmap

alagappan

unharmable

polarography

taenian


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: eastma
cipher variations:
fbtunb gcuvoc hdvwpd iewxqe jfxyrf
kgyzsg lhzath miabui njbcvj okcdwk
pldexl qmefym rnfgzn soghao tphibp
uqijcq vrjkdr wskles xtlmft yumngu
zvnohv awopiw bxpqjx cyqrky dzrslz

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: eastma
Cipher: vzhgnz

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: eastma
Cipher: AABAA AAAAA BAAAB BAABA ABABB AAAAA

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: eastma
cipher variations:
fbtunbnbdglbvbnsjbdbxehblbhqfbtbrcdbjblazbrbvmxb
zbfyvbhbpktbpbzwrbxbjipbgcuvococehmcwcotkcecyfic
mcirgcucsdeckcmbacscwnycacgzwcicqlucqcaxscyckjqc
hdvwpdpdfindxdpuldfdzgjdndjshdvdtefdldncbdtdxozd
bdhaxdjdrmvdrdbytdzdlkrdiewxqeqegjoeyeqvmegeahke
oektieweufgemeodceueypaeceibyekesnweseczueaemlse
jfxyrfrfhkpfzfrwnfhfbilfpflujfxfvghfnfpedfvfzqbf
dfjczflftoxftfdavfbfnmtfkgyzsgsgilqgagsxogigcjmg
qgmvkgygwhigogqfegwgarcgegkdagmgupygugebwgcgonug
lhzaththjmrhbhtyphjhdknhrhnwlhzhxijhphrgfhxhbsdh
fhlebhnhvqzhvhfcxhdhpovhmiabuiuiknsiciuzqikieloi
sioxmiaiyjkiqishgiyicteigimfcioiwraiwigdyieiqpwi
njbcvjvjlotjdjvarjljfmpjtjpynjbjzkljrjtihjzjdufj
hjngdjpjxsbjxjhezjfjrqxjokcdwkwkmpukekwbskmkgnqk
ukqzokckalmkskujikakevgkikohekqkytckykifakgksryk
pldexlxlnqvlflxctlnlhorlvlrapldlbmnltlvkjlblfwhl
jlpiflrlzudlzljgblhltszlqmefymymorwmgmydumomipsm
wmsbqmemcnomumwlkmcmgximkmqjgmsmavemamkhcmimutam
rnfgznznpsxnhnzevnpnjqtnxntcrnfndopnvnxmlndnhyjn
lnrkhntnbwfnbnlidnjnvubnsoghaoaoqtyoioafwoqokruo
youdsogoepqowoynmoeoizkomosliouocxgocomjeokowvco
tphibpbpruzpjpbgxprplsvpzpvetphpfqrpxpzonpfpjalp
nptmjpvpdyhpdpnkfplpxwdpuqijcqcqsvaqkqchyqsqmtwq
aqwfuqiqgrsqyqapoqgqkbmqoqunkqwqeziqeqolgqmqyxeq
vrjkdrdrtwbrlrdizrtrnuxrbrxgvrjrhstrzrbqprhrlcnr
prvolrxrfajrfrpmhrnrzyfrwsklesesuxcsmsejasusovys
csyhwsksitusascrqsismdosqswpmsysgbksgsqnisosazgs
xtlmftftvydtntfkbtvtpwztdtzixtltjuvtbtdsrtjtnept
rtxqntzthclthtrojtptbahtyumnguguwzeuouglcuwuqxau
euajyumukvwucuetsukuofqusuyrouauidmuiuspkuqucbiu
zvnohvhvxafvpvhmdvxvrybvfvbkzvnvlwxvdvfutvlvpgrv
tvzspvbvjenvjvtqlvrvdcjvawopiwiwybgwqwinewywszcw
gwclawowmxywewgvuwmwqhswuwatqwcwkfowkwurmwswedkw
bxpqjxjxzchxrxjofxzxtadxhxdmbxpxnyzxfxhwvxnxritx
vxburxdxlgpxlxvsnxtxfelxcyqrkykyadiysykpgyayubey
iyencyqyozaygyixwyoysjuywycvsyeymhqymywtoyuygfmy
dzrslzlzbejztzlqhzbzvcfzjzfodzrzpabzhzjyxzpztkvz
xzdwtzfznirznzxupzvzhgnzeastmamacfkauamriacawdga
kagpeasaqbcaiakzyaqaulwayaexuagaojsaoayvqawaihoa

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: eastma
Cipher: rnfgzn

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: eastma
Cipher: 511134442311

Extended Methods:
Method #1

Plaintext: eastma
method variations:
kfxyrfplcdwluqhibqzvnogv

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
e a s t m a 
5 1 3 4 2 1 
1 1 4 4 3 1 
They are then read out in rows:
513421114431
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: eastma
Cipher: esbatc

Read more ...
Method #3

Plaintext: eastma
method variations:
alticv lticva ticval
icvalt cvalti valtic

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: eastma

all 720 cipher variations:
eastma eastam easmta easmat easamt easatm eatsma eatsam eatmsa eatmas eatams
eatasm eamtsa eamtas eamsta eamsat eamast eamats eaatms eaatsm eaamts eaamst
eaasmt eaastm esatma esatam esamta esamat esaamt esaatm estama estaam estmaa
estmaa estama estaam esmtaa esmtaa esmata esmaat esmaat esmata esatma esatam
esamta esamat esaamt esaatm etsama etsaam etsmaa etsmaa etsama etsaam etasma
etasam etamsa etamas etaams etaasm etmasa etmaas etmsaa etmsaa etmasa etmaas
etaams etaasm etamas etamsa etasma etasam emstaa emstaa emsata emsaat emsaat
emsata emtsaa emtsaa emtasa emtaas emtaas emtasa ematsa ematas emasta emasat
emaast emaats ematas ematsa emaats emaast emasat emasta eastma eastam easmta
easmat easamt easatm eatsma eatsam eatmsa eatmas eatams eatasm eamtsa eamtas
eamsta eamsat eamast eamats eaatms eaatsm eaamts eaamst eaasmt eaastm aestma
aestam aesmta aesmat aesamt aesatm aetsma aetsam aetmsa aetmas aetams aetasm
aemtsa aemtas aemsta aemsat aemast aemats aeatms aeatsm aeamts aeamst aeasmt
aeastm asetma asetam asemta asemat aseamt aseatm astema asteam astmea astmae
astame astaem asmtea asmtae asmeta asmeat asmaet asmate asatme asatem asamte
asamet asaemt asaetm atsema atseam atsmea atsmae atsame atsaem atesma atesam
atemsa atemas ateams ateasm atmesa atmeas atmsea atmsae atmase atmaes ataems
ataesm atames atamse atasme atasem amstea amstae amseta amseat amsaet amsate
amtsea amtsae amtesa amteas amtaes amtase ametsa ametas amesta amesat ameast
ameats amates amatse amaets amaest amaset amaste aastme aastem aasmte aasmet
aasemt aasetm aatsme aatsem aatmse aatmes aatems aatesm aamtse aamtes aamste
aamset aamest aamets aaetms aaetsm aaemts aaemst aaesmt aaestm saetma saetam
saemta saemat saeamt saeatm satema sateam satmea satmae satame sataem samtea
samtae sameta sameat samaet samate saatme saatem saamte saamet saaemt saaetm
seatma seatam seamta seamat seaamt seaatm setama setaam setmaa setmaa setama
setaam semtaa semtaa semata semaat semaat semata seatma seatam seamta seamat
seaamt seaatm steama steaam stemaa stemaa steama steaam staema staeam stamea
stamae staame staaem stmaea stmaae stmeaa stmeaa stmaea stmaae staame staaem
stamae stamea staema staeam smetaa smetaa smeata smeaat smeaat smeata smteaa
smteaa smtaea smtaae smtaae smtaea smatea smatae smaeta smaeat smaaet smaate
smatae smatea smaate smaaet smaeat smaeta saetma saetam saemta saemat saeamt
saeatm satema sateam satmea satmae satame sataem samtea samtae sameta sameat
samaet samate saatme saatem saamte saamet saaemt saaetm tasema taseam tasmea
tasmae tasame tasaem taesma taesam taemsa taemas taeams taeasm tamesa tameas
tamsea tamsae tamase tamaes taaems taaesm taames taamse taasme taasem tsaema
tsaeam tsamea tsamae tsaame tsaaem tseama tseaam tsemaa tsemaa tseama tseaam
tsmeaa tsmeaa tsmaea tsmaae tsmaae tsmaea tsaema tsaeam tsamea tsamae tsaame
tsaaem tesama tesaam tesmaa tesmaa tesama tesaam teasma teasam teamsa teamas
teaams teaasm temasa temaas temsaa temsaa temasa temaas teaams teaasm teamas
teamsa teasma teasam tmseaa tmseaa tmsaea tmsaae tmsaae tmsaea tmesaa tmesaa
tmeasa tmeaas tmeaas tmeasa tmaesa tmaeas tmasea tmasae tmaase tmaaes tmaeas
tmaesa tmaaes tmaase tmasae tmasea tasema taseam tasmea tasmae tasame tasaem
taesma taesam taemsa taemas taeams taeasm tamesa tameas tamsea tamsae tamase
tamaes taaems taaesm taames taamse taasme taasem mastea mastae maseta maseat
masaet masate matsea matsae matesa mateas mataes matase maetsa maetas maesta
maesat maeast maeats maates maatse maaets maaest maaset maaste msatea msatae
msaeta msaeat msaaet msaate mstaea mstaae msteaa msteaa mstaea mstaae msetaa
msetaa mseata mseaat mseaat mseata msatea msatae msaeta msaeat msaaet msaate
mtsaea mtsaae mtseaa mtseaa mtsaea mtsaae mtasea mtasae mtaesa mtaeas mtaaes
mtaase mteasa mteaas mtesaa mtesaa mteasa mteaas mtaaes mtaase mtaeas mtaesa
mtasea mtasae mestaa mestaa mesata mesaat mesaat mesata metsaa metsaa metasa
metaas metaas metasa meatsa meatas measta measat meaast meaats meatas meatsa
meaats meaast measat measta mastea mastae maseta maseat masaet masate matsea
matsae matesa mateas mataes matase maetsa maetas maesta maesat maeast maeats
maates maatse maaets maaest maaset maaste aastme aastem aasmte aasmet aasemt
aasetm aatsme aatsem aatmse aatmes aatems aatesm aamtse aamtes aamste aamset
aamest aamets aaetms aaetsm aaemts aaemst aaesmt aaestm asatme asatem asamte
asamet asaemt asaetm astame astaem astmae astmea astema asteam asmtae asmtea
asmate asmaet asmeat asmeta asetma asetam asemta asemat aseamt aseatm atsame
atsaem atsmae atsmea atsema atseam atasme atasem atamse atames ataems ataesm
atmase atmaes atmsae atmsea atmesa atmeas ateams ateasm atemas atemsa atesma
atesam amstae amstea amsate amsaet amseat amseta amtsae amtsea amtase amtaes
amteas amtesa amatse amates amaste amaset amaest amaets ametas ametsa ameats
ameast amesat amesta aestma aestam aesmta aesmat aesamt aesatm aetsma aetsam
aetmsa aetmas aetams aetasm aemtsa aemtas aemsta aemsat aemast aemats aeatms
aeatsm aeamts aeamst aeasmt aeastm

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

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