easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

multavere

harvard

domestica

intersternal

nonmucilaginous

tenants

labgw

moodishly

dayglow

offcome

cambyuskan

cenchrea

oophytes

cholic

susotoxin

dorati

imparalleled

mobilitateque


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: primer
cipher variations:
qsjnfs rtkogt sulphu tvmqiv uwnrjw
vxoskx wyptly xzqumz yarvna zbswob
actxpc bduyqd cevzre dfwasf egxbtg
fhycuh gizdvi hjaewj ikbfxk jlcgyl
kmdhzm lneian mofjbo npgkcp oqhldq

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: primer
Cipher: kirnvi

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: primer
Cipher: ABBBA BAAAA ABAAA ABABB AABAA BAAAA

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: primer
cipher variations:
qsjnfsuazlnayipjvicqfhdqgyvflykgldtgswrzjwwehxre
amxvzmeunthuicdrpcmktpxkrtkogtvbamobzjqkwjdrgier
hzwgmzlhmeuhtxsakxxfiysfbnywanfvouivjdesqdnluqyl
sulphuwcbnpcakrlxkeshjfsiaxhnaminfviuytblyygjztg
cozxbogwpvjwkeftreomvrzmtvmqivxdcoqdblsmylftikgt
jbyiobnjogwjvzucmzzhkauhdpaycphxqwkxlfgusfpnwsan
uwnrjwyedprecmtnzmgujlhukczjpcokphxkwavdnaailbvi
eqbzdqiyrxlymghvtgqoxtbovxoskxzfeqsfdnuoanhvkmiv
ldakqdplqiylxbweobbjmcwjfrcaerjzsymznhiwuhrpyucp
wyptlyagfrtgeovpboiwlnjwmeblreqmrjzmycxfpcckndxk
gsdbfskatznaoijxvisqzvdqxzqumzbhgsuhfpwqcpjxmokx
nfcmsfrnskanzdygqddloeylhtecgtlbuaobpjkywjtrawer
yarvnacihtvigqxrdqkynplyogdntgsotlboaezhreempfzm
iufdhumcvbpcqklzxkusbxfszbswobdjiuwjhryserlzoqmz
pheouhtpumcpbfaisffnqganjvgeivndwcqdrlmaylvtcygt
actxpcekjvxkisztfsmaprnaqifpviuqvndqcgbjtggorhbo
kwhfjwoexdresmnbzmwudzhubduyqdflkwyljtaugtnbqsob
rjgqwjvrwoerdhckuhhpsicplxigkxpfyesftnocanxveaiv
cevzregmlxzmkubvhuocrtpcskhrxkwsxpfseidlviiqtjdq
myjhlyqgzftguopdboywfbjwdfwasfhnmyanlvcwivpdsuqd
tlisylxtyqgtfjemwjjrukernzkimzrhaguhvpqecpzxgckx
egxbtgionzbomwdxjwqetvreumjtzmyuzrhugkfnxkksvlfs
oaljnasibhviwqrfdqayhdlyfhycuhjpoacpnxeykxrfuwsf
vnkuanzvasivhlgoylltwmgtpbmkobtjciwjxrsgerbziemz
gizdvikqpbdqoyfzlysgvxtgwolvboawbtjwimhpzmmuxnhu
qcnlpcukdjxkysthfscajfnahjaewjlrqcerpzgamzthwyuh
xpmwcpbxcukxjniqannvyoivrdomqdvlekylztuigtdbkgob
ikbfxkmsrdfsqahbnauixzviyqnxdqcydvlykojrboowzpjw
sepnrewmflzmauvjhueclhpcjlcgylntsegtrbicobvjyawj
zroyerdzewmzlpkscppxaqkxtfqosfxngmanbvwkivfdmiqd
kmdhzmoutfhuscjdpcwkzbxkaspzfseafxnamqltdqqybrly
ugrptgyohnbocwxljwgenjrelneianpvugivtdkeqdxlacyl
btqagtfbgyobnrmuerrzcsmzvhsquhzpiocpdxymkxhfoksf
mofjboqwvhjwuelfreymbdzmcurbhugchzpcosnvfssadtna
witrviaqjpdqeyznlyigpltgnpgkcprxwikxvfmgsfzncean
dvscivhdiaqdptowgttbeuobxjuswjbrkqerfzaomzjhqmuh
oqhldqsyxjlywgnhtgaodfboewtdjwiejbrequpxhuucfvpc
ykvtxkcslrfsgabpnakirnviprimertzykmzxhoiuhbpegcp
fxuekxjfkcsfrvqyivvdgwqdzlwuyldtmsgthbcqobljsowj

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: primer
Cipher: cevzre

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: primer
Cipher: 532442235124

Extended Methods:
Method #1

Plaintext: primer
method variations:
uworkwzbtwpbegybugkmdgzm

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
p r i m e r 
5 2 4 2 5 2 
3 4 2 3 1 4 
They are then read out in rows:
524252342314
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: primer
Cipher: kiksmq

Read more ...
Method #3

Plaintext: primer
method variations:
htgxfy tgxfyh gxfyht
xfyhtg fyhtgx yhtgxf

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: primer

all 720 cipher variations:
primer primre priemr prierm prirem prirme prmier prmire prmeir prmeri prmrei
prmrie premir premri preimr preirm prerim prermi prrmei prrmie prremi prreim
prriem prrime pirmer pirmre piremr pirerm pirrem pirrme pimrer pimrre pimerr
pimerr pimrer pimrre piemrr piemrr piermr pierrm pierrm piermr pirmer pirmre
piremr pirerm pirrem pirrme pmirer pmirre pmierr pmierr pmirer pmirre pmrier
pmrire pmreir pmreri pmrrei pmrrie pmerir pmerri pmeirr pmeirr pmerir pmerri
pmrrei pmrrie pmreri pmreir pmrier pmrire peimrr peimrr peirmr peirrm peirrm
peirmr pemirr pemirr pemrir pemrri pemrri pemrir permir permri perimr perirm
perrim perrmi permri permir perrmi perrim perirm perimr primer primre priemr
prierm prirem prirme prmier prmire prmeir prmeri prmrei prmrie premir premri
preimr preirm prerim prermi prrmei prrmie prremi prreim prriem prrime rpimer
rpimre rpiemr rpierm rpirem rpirme rpmier rpmire rpmeir rpmeri rpmrei rpmrie
rpemir rpemri rpeimr rpeirm rperim rpermi rprmei rprmie rpremi rpreim rpriem
rprime ripmer ripmre ripemr riperm riprem riprme rimper rimpre rimepr rimerp
rimrep rimrpe riempr riemrp riepmr rieprm rierpm riermp rirmep rirmpe riremp
rirepm rirpem rirpme rmiper rmipre rmiepr rmierp rmirep rmirpe rmpier rmpire
rmpeir rmperi rmprei rmprie rmepir rmepri rmeipr rmeirp rmerip rmerpi rmrpei
rmrpie rmrepi rmreip rmriep rmripe reimpr reimrp reipmr reiprm reirpm reirmp
remipr remirp rempir rempri remrpi remrip repmir repmri repimr repirm reprim
reprmi rermpi rermip rerpmi rerpim reripm rerimp rrimep rrimpe rriemp rriepm
rripem rripme rrmiep rrmipe rrmeip rrmepi rrmpei rrmpie rremip rrempi rreimp
rreipm rrepim rrepmi rrpmei rrpmie rrpemi rrpeim rrpiem rrpime irpmer irpmre
irpemr irperm irprem irprme irmper irmpre irmepr irmerp irmrep irmrpe irempr
iremrp irepmr ireprm irerpm irermp irrmep irrmpe irremp irrepm irrpem irrpme
iprmer iprmre ipremr iprerm iprrem iprrme ipmrer ipmrre ipmerr ipmerr ipmrer
ipmrre ipemrr ipemrr ipermr iperrm iperrm ipermr iprmer iprmre ipremr iprerm
iprrem iprrme imprer imprre imperr imperr imprer imprre imrper imrpre imrepr
imrerp imrrep imrrpe imerpr imerrp imeprr imeprr imerpr imerrp imrrep imrrpe
imrerp imrepr imrper imrpre iepmrr iepmrr ieprmr ieprrm ieprrm ieprmr iemprr
iemprr iemrpr iemrrp iemrrp iemrpr iermpr iermrp ierpmr ierprm ierrpm ierrmp
iermrp iermpr ierrmp ierrpm ierprm ierpmr irpmer irpmre irpemr irperm irprem
irprme irmper irmpre irmepr irmerp irmrep irmrpe irempr iremrp irepmr ireprm
irerpm irermp irrmep irrmpe irremp irrepm irrpem irrpme mriper mripre mriepr
mrierp mrirep mrirpe mrpier mrpire mrpeir mrperi mrprei mrprie mrepir mrepri
mreipr mreirp mrerip mrerpi mrrpei mrrpie mrrepi mrreip mrriep mrripe mirper
mirpre mirepr mirerp mirrep mirrpe miprer miprre miperr miperr miprer miprre
mieprr mieprr mierpr mierrp mierrp mierpr mirper mirpre mirepr mirerp mirrep
mirrpe mpirer mpirre mpierr mpierr mpirer mpirre mprier mprire mpreir mpreri
mprrei mprrie mperir mperri mpeirr mpeirr mperir mperri mprrei mprrie mpreri
mpreir mprier mprire meiprr meiprr meirpr meirrp meirrp meirpr mepirr mepirr
meprir meprri meprri meprir merpir merpri meripr merirp merrip merrpi merpri
merpir merrpi merrip merirp meripr mriper mripre mriepr mrierp mrirep mrirpe
mrpier mrpire mrpeir mrperi mrprei mrprie mrepir mrepri mreipr mreirp mrerip
mrerpi mrrpei mrrpie mrrepi mrreip mrriep mrripe erimpr erimrp eripmr eriprm
erirpm erirmp ermipr ermirp ermpir ermpri ermrpi ermrip erpmir erpmri erpimr
erpirm erprim erprmi errmpi errmip errpmi errpim erripm errimp eirmpr eirmrp
eirpmr eirprm eirrpm eirrmp eimrpr eimrrp eimprr eimprr eimrpr eimrrp eipmrr
eipmrr eiprmr eiprrm eiprrm eiprmr eirmpr eirmrp eirpmr eirprm eirrpm eirrmp
emirpr emirrp emiprr emiprr emirpr emirrp emripr emrirp emrpir emrpri emrrpi
emrrip emprir emprri empirr empirr emprir emprri emrrpi emrrip emrpri emrpir
emripr emrirp epimrr epimrr epirmr epirrm epirrm epirmr epmirr epmirr epmrir
epmrri epmrri epmrir eprmir eprmri eprimr eprirm eprrim eprrmi eprmri eprmir
eprrmi eprrim eprirm eprimr erimpr erimrp eripmr eriprm erirpm erirmp ermipr
ermirp ermpir ermpri ermrpi ermrip erpmir erpmri erpimr erpirm erprim erprmi
errmpi errmip errpmi errpim erripm errimp rrimep rrimpe rriemp rriepm rripem
rripme rrmiep rrmipe rrmeip rrmepi rrmpei rrmpie rremip rrempi rreimp rreipm
rrepim rrepmi rrpmei rrpmie rrpemi rrpeim rrpiem rrpime rirmep rirmpe riremp
rirepm rirpem rirpme rimrep rimrpe rimerp rimepr rimper rimpre riemrp riempr
riermp rierpm rieprm riepmr ripmer ripmre ripemr riperm riprem riprme rmirep
rmirpe rmierp rmiepr rmiper rmipre rmriep rmripe rmreip rmrepi rmrpei rmrpie
rmerip rmerpi rmeirp rmeipr rmepir rmepri rmprei rmprie rmperi rmpeir rmpier
rmpire reimrp reimpr reirmp reirpm reiprm reipmr remirp remipr remrip remrpi
rempri rempir rermip rermpi rerimp reripm rerpim rerpmi repmri repmir reprmi
reprim repirm repimr rpimer rpimre rpiemr rpierm rpirem rpirme rpmier rpmire
rpmeir rpmeri rpmrei rpmrie rpemir rpemri rpeimr rpeirm rperim rpermi rprmei
rprmie rpremi rpreim rpriem rprime

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

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