easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

sthelens

calotypic

deemster

regissemusque

iuravistique

disicio

upheavers

cystoidea

unaccomplished

anthocyanicus

paragram

proferes

processeras

carcione

ideographically

xanthosiderite

phylloxeridae

titanolatry


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: upleap
cipher variations:
vqmfbq wrngcr xsohds ytpiet zuqjfu
avrkgv bwslhw cxtmix dyunjy ezvokz
fawpla gbxqmb hcyrnc idzsod jeatpe
kfbuqf lgcvrg mhdwsh niexti ojfyuj
pkgzvk qlhawl rmibxm snjcyn tokdzo

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: upleap
Cipher: fkovzk

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: upleap
Cipher: BAABB ABBBA ABABA AABAA AAAAA ABBBA

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: upleap
cipher variations:
vqmfbqjuinbuxyevbylcadbczgwlbgnkstbkpskjbsdwgrbw
raczbafeyhbetiupbihmqxbmwrngcrkvjocvyzfwczmdbecd
ahxmcholtuclqtlkctexhscxsbdacbgfzicfujvqcjinrycn
xsohdslwkpdwzagxdanecfdebiyndipmuvdmrumldufyitdy
tcebdchgajdgvkwrdkjoszdoytpietmxlqexabhyebofdgef
cjzoejqnvwensvnmevgzjuezudfcedihbkehwlxselkptaep
zuqjfunymrfybcizfcpgehfgdkapfkrowxfotwonfwhakvfa
vegdfejiclfixmytfmlqubfqavrkgvoznsgzcdjagdqhfigh
elbqglspxygpuxpogxiblwgbwfhegfkjdmgjynzugnmrvcgr
bwslhwpaothadekbherigjhifmcrhmtqyzhqvyqphyjcmxhc
xgifhglkenhkzoavhonswdhscxtmixqbpuibeflcifsjhkij
gndsinurzairwzrqizkdnyidyhjgihmlfoilapbwipotxeit
dyunjyrcqvjcfgmdjgtkiljkhoetjovsabjsxasrjaleozje
zikhjinmgpjmbqcxjqpuyfjuezvokzsdrwkdghnekhuljmkl
ipfukpwtbcktybtskbmfpakfajlikjonhqkncrdykrqvzgkv
fawplatesxlehioflivmknlmjqgvlqxucdluzcutlcngqblg
bkmjlkpoirlodsezlsrwahlwgbxqmbuftymfijpgmjwnlomn
krhwmryvdemvadvumdohrcmhclnkmlqpjsmpetfamtsxbimx
hcyrncvguzngjkqhnkxompnolsixnszwefnwbewvnepisdni
dmolnmrqktnqfugbnutycjnyidzsodwhvaohklriolypnqop
mtjyotaxfgoxcfxwofqjteojenpmonsrluorgvhcovuzdkoz
jeatpexiwbpilmsjpmzqorpqnukzpubyghpydgyxpgrkufpk
foqnpotsmvpshwidpwvaelpakfbuqfyjxcqjmntkqnarpsqr
ovlaqvczhiqzehzyqhslvgqlgproqputnwqtixjeqxwbfmqb
lgcvrgzkydrknoulrobsqtrspwmbrwdaijrafiazritmwhrm
hqsprqvuoxrujykfryxcgnrcmhdwshalzeslopvmspctrust
qxncsxebjksbgjbasjunxisnirtqsrwvpysvkzlgszydhosd
niextibmaftmpqwntqdusvturyodtyfckltchkcbtkvoyjto
jsurtsxwqztwlamhtazeipteojfyujcnbgunqrxourevtwuv
szpeuzgdlmudildculwpzkupktvsutyxrauxmbniubafjquf
pkgzvkdochvorsypvsfwuxvwtaqfvahemnvejmedvmxqalvq
luwtvuzysbvyncojvcbgkrvgqlhawlepdiwpstzqwtgxvywx
ubrgwbifnowfknfewnyrbmwrmvxuwvaztcwzodpkwdchlswh
rmibxmfqejxqtuarxuhywzxyvcshxcjgopxglogfxozscnxs
nwyvxwbaudxapeqlxedimtxisnjcyngrfkyruvbsyvizxayz
wdtiydkhpqyhmphgypatdoytoxzwyxcbveybqfrmyfejnuyj
tokdzohsglzsvwctzwjaybzaxeujzeliqrzinqihzqbuepzu
pyaxzydcwfzcrgsnzgfkovzkupleapithmatwxduaxkbzcab
yfvkafmjrsajorjiarcvfqavqzbyazedxgadshtoahglpwal

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: upleap
Cipher: hcyrnc

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: upleap
Cipher: 545313511153

Extended Methods:
Method #1

Plaintext: upleap
method variations:
zuqkfuezvplzkeauqepkfzvk

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
u p l e a p 
5 5 1 5 1 5 
4 3 3 1 1 3 
They are then read out in rows:
551515433113
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: upleap
Cipher: zvvocl

Read more ...
Method #3

Plaintext: upleap
method variations:
ycxavx cxavxy xavxyc
avxycx vxycxa xycxav

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: upleap

all 720 cipher variations:
upleap uplepa uplaep uplape uplpae uplpea upelap upelpa upealp upeapl upepal
upepla upaelp upaepl upalep upalpe upaple upapel uppeal uppela uppael uppale
upplae upplea ulpeap ulpepa ulpaep ulpape ulppae ulppea ulepap uleppa uleapp
uleapp ulepap uleppa ulaepp ulaepp ulapep ulappe ulappe ulapep ulpeap ulpepa
ulpaep ulpape ulppae ulppea uelpap uelppa uelapp uelapp uelpap uelppa ueplap
ueplpa uepalp uepapl ueppal ueppla ueaplp ueappl uealpp uealpp ueaplp ueappl
ueppal ueppla uepapl uepalp ueplap ueplpa ualepp ualepp ualpep ualppe ualppe
ualpep uaelpp uaelpp uaeplp uaeppl uaeppl uaeplp uapelp uapepl uaplep uaplpe
uapple uappel uapepl uapelp uappel uapple uaplpe uaplep upleap uplepa uplaep
uplape uplpae uplpea upelap upelpa upealp upeapl upepal upepla upaelp upaepl
upalep upalpe upaple upapel uppeal uppela uppael uppale upplae upplea puleap
pulepa pulaep pulape pulpae pulpea puelap puelpa puealp pueapl puepal puepla
puaelp puaepl pualep pualpe puaple puapel pupeal pupela pupael pupale puplae
puplea plueap pluepa pluaep pluape plupae plupea pleuap pleupa pleaup pleapu
plepau plepua plaeup plaepu plauep plaupe plapue plapeu plpeau plpeua plpaeu
plpaue plpuae plpuea peluap pelupa pelaup pelapu pelpau pelpua peulap peulpa
peualp peuapl peupal peupla peaulp peaupl pealup pealpu peaplu peapul pepual
pepula pepaul pepalu peplau peplua paleup palepu paluep palupe palpue palpeu
paelup paelpu paeulp paeupl paepul paeplu pauelp pauepl paulep paulpe pauple
paupel papeul papelu papuel papule paplue papleu ppleau ppleua pplaeu pplaue
ppluae ppluea ppelau ppelua ppealu ppeaul ppeual ppeula ppaelu ppaeul ppaleu
ppalue ppaule ppauel ppueal ppuela ppuael ppuale ppulae ppulea lpueap lpuepa
lpuaep lpuape lpupae lpupea lpeuap lpeupa lpeaup lpeapu lpepau lpepua lpaeup
lpaepu lpauep lpaupe lpapue lpapeu lppeau lppeua lppaeu lppaue lppuae lppuea
lupeap lupepa lupaep lupape luppae luppea luepap lueppa lueapp lueapp luepap
lueppa luaepp luaepp luapep luappe luappe luapep lupeap lupepa lupaep lupape
luppae luppea leupap leuppa leuapp leuapp leupap leuppa lepuap lepupa lepaup
lepapu leppau leppua leapup leappu leaupp leaupp leapup leappu leppau leppua
lepapu lepaup lepuap lepupa lauepp lauepp laupep lauppe lauppe laupep laeupp
laeupp laepup laeppu laeppu laepup lapeup lapepu lapuep lapupe lappue lappeu
lapepu lapeup lappeu lappue lapupe lapuep lpueap lpuepa lpuaep lpuape lpupae
lpupea lpeuap lpeupa lpeaup lpeapu lpepau lpepua lpaeup lpaepu lpauep lpaupe
lpapue lpapeu lppeau lppeua lppaeu lppaue lppuae lppuea epluap eplupa eplaup
eplapu eplpau eplpua epulap epulpa epualp epuapl epupal epupla epaulp epaupl
epalup epalpu epaplu epapul eppual eppula eppaul eppalu epplau epplua elpuap
elpupa elpaup elpapu elppau elppua elupap eluppa eluapp eluapp elupap eluppa
elaupp elaupp elapup elappu elappu elapup elpuap elpupa elpaup elpapu elppau
elppua eulpap eulppa eulapp eulapp eulpap eulppa euplap euplpa eupalp eupapl
euppal euppla euaplp euappl eualpp eualpp euaplp euappl euppal euppla eupapl
eupalp euplap euplpa ealupp ealupp ealpup ealppu ealppu ealpup eaulpp eaulpp
eauplp eauppl eauppl eauplp eapulp eapupl eaplup eaplpu eapplu eappul eapupl
eapulp eappul eapplu eaplpu eaplup epluap eplupa eplaup eplapu eplpau eplpua
epulap epulpa epualp epuapl epupal epupla epaulp epaupl epalup epalpu epaplu
epapul eppual eppula eppaul eppalu epplau epplua apleup aplepu apluep aplupe
aplpue aplpeu apelup apelpu apeulp apeupl apepul apeplu apuelp apuepl apulep
apulpe apuple apupel appeul appelu appuel appule applue appleu alpeup alpepu
alpuep alpupe alppue alppeu alepup aleppu aleupp aleupp alepup aleppu aluepp
aluepp alupep aluppe aluppe alupep alpeup alpepu alpuep alpupe alppue alppeu
aelpup aelppu aelupp aelupp aelpup aelppu aeplup aeplpu aepulp aepupl aeppul
aepplu aeuplp aeuppl aeulpp aeulpp aeuplp aeuppl aeppul aepplu aepupl aepulp
aeplup aeplpu aulepp aulepp aulpep aulppe aulppe aulpep auelpp auelpp aueplp
aueppl aueppl aueplp aupelp aupepl auplep auplpe aupple auppel aupepl aupelp
auppel aupple auplpe auplep apleup aplepu apluep aplupe aplpue aplpeu apelup
apelpu apeulp apeupl apepul apeplu apuelp apuepl apulep apulpe apuple apupel
appeul appelu appuel appule applue appleu ppleau ppleua pplaeu pplaue ppluae
ppluea ppelau ppelua ppealu ppeaul ppeual ppeula ppaelu ppaeul ppaleu ppalue
ppaule ppauel ppueal ppuela ppuael ppuale ppulae ppulea plpeau plpeua plpaeu
plpaue plpuae plpuea plepau plepua pleapu pleaup pleuap pleupa plaepu plaeup
plapeu plapue plaupe plauep plueap pluepa pluaep pluape plupae plupea pelpau
pelpua pelapu pelaup peluap pelupa peplau peplua pepalu pepaul pepual pepula
peaplu peapul pealpu pealup peaulp peaupl peupal peupla peuapl peualp peulap
peulpa palepu paleup palpeu palpue palupe paluep paelpu paelup paeplu paepul
paeupl paeulp papelu papeul papleu paplue papule papuel pauepl pauelp paupel
pauple paulpe paulep puleap pulepa pulaep pulape pulpae pulpea puelap puelpa
puealp pueapl puepal puepla puaelp puaepl pualep pualpe puaple puapel pupeal
pupela pupael pupale puplae puplea

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

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