easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

nequaquamque

rampion

birchrun

tsugawa

inappreciatively

greater

tsumebite

gynecium

cambios

praeceperim

caingang

tenojoki

tortulous

liscusque

planuria

laughworthy

seeliger

locatamque


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: dyggve
cipher variations:
ezhhwf faiixg gbjjyh hckkzi idllaj
jemmbk kfnncl lgoodm mhppen niqqfo
ojrrgp pksshq qlttir rmuujs snvvkt
towwlu upxxmv vqyynw wrzzox xsaapy
ytbbqz zuccra avddsb bweetc cxffud

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: dyggve
Cipher: wbttev

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: dyggve
Cipher: AAABB BABBA AABBA AABBA BBBAB AABAA

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: dyggve
cipher variations:
ezhhwfkvttmnqrffcvwnrrsdcjddilifppytuxnnejatzzur
gpllkzmlxxahshjjqpydvvgxfaiixglwuunorsggdwxosste
dkeejmjgqqzuvyoofkbuaavshqmmlanmyybitikkrqzewwhy
gbjjyhmxvvopsthhexypttufelffknkhrravwzppglcvbbwt
irnnmbonzzcjujllsrafxxizhckkzinywwpqtuiifyzquuvg
fmgglolissbwxaqqhmdwccxujsooncpoaadkvkmmtsbgyyja
idllajozxxqruvjjgzarvvwhgnhhmpmjttcxybrrinexddyv
ktppodqpbbelwlnnutchzzkbjemmbkpayyrsvwkkhabswwxi
hoiinqnkuudyzcssjofyeezwluqqperqccfmxmoovudiaalc
kfnnclqbzzstwxllibctxxyjipjjorolvvezadttkpgzffax
mvrrqfsrddgnynppwvejbbmdlgoodmrcaatuxymmjcduyyzk
jqkkpspmwwfabeuulqhaggbynwssrgtseehozoqqxwfkccne
mhppensdbbuvyznnkdevzzalkrllqtqnxxgbcfvvmribhhcz
oxttshutffipaprryxglddofniqqfoteccvwzaoolefwaabm
lsmmruroyyhcdgwwnsjciidapyuutivuggjqbqsszyhmeepg
ojrrgpufddwxabppmfgxbbcnmtnnsvspzzidehxxotkdjjeb
qzvvujwvhhkrcrttazinffqhpksshqvgeexybcqqnghyccdo
nuootwtqaajefiyypulekkfcrawwvkxwiilsdsuubajoggri
qlttirwhffyzcdrrohizddepovppuxurbbkfgjzzqvmfllgd
sbxxwlyxjjmtetvvcbkphhsjrmuujsxiggzadesspijaeefq
pwqqvyvscclghkaarwngmmhetcyyxmzykknufuwwdclqiitk
snvvktyjhhabefttqjkbffgrqxrrwzwtddmhilbbsxohnnif
udzzynazllovgvxxedmrjjultowwluzkiibcfguurklcgghs
ryssxaxueenijmcctypioojgveaazobammpwhwyyfenskkvm
upxxmvaljjcdghvvslmdhhitszttybyvffojkndduzqjppkh
wfbbapcbnnqxixzzgfotllwnvqyynwbmkkdehiwwtmneiiju
tauuzczwggpkloeevarkqqlixgccbqdcooryjyaahgpummxo
wrzzoxcnllefijxxunofjjkvubvvadaxhhqlmpffwbslrrmj
yhddcredppszkzbbihqvnnypxsaapydommfgjkyyvopgkklw
vcwwbebyiirmnqggxctmssnkzieedsfeqqtalaccjirwoozq
ytbbqzepnnghklzzwpqhllmxwdxxcfczjjsnorhhydunttol
ajffetgfrrubmbddkjsxpparzuccrafqoohilmaaxqrimmny
xeyydgdakktopsiizevouupmbkggfuhgssvcnceelktyqqbs
avddsbgrppijmnbbyrsjnnozyfzzehebllupqtjjafwpvvqn
clhhgvihttwdodffmluzrrctbweetchsqqjknocczstkoopa
zgaafifcmmvqrukkbgxqwwrodmiihwjiuuxepeggnmvassdu
cxffuditrrklopddatulppqbahbbgjgdnnwrsvllchyrxxsp
enjjixkjvvyfqfhhonwbttevdyggvejusslmpqeebuvmqqrc
bicchkheooxstwmmdizsyytqfokkjylkwwzgrgiipoxcuufw

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: dyggve
Cipher: qlttir

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: dyggve
Cipher: 414522221551

Extended Methods:
Method #1

Plaintext: dyggve
method variations:
idmmakoirrfptowwluytbbqz

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
d y g g v e 
4 4 2 2 1 5 
1 5 2 2 5 1 
They are then read out in rows:
442215152251
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: dyggve
Cipher: tgvvge

Read more ...
Method #3

Plaintext: dyggve
method variations:
qkgbzq kgbzqq gbzqqk
bzqqkg zqqkgb qqkgbz

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: dyggve

all 720 cipher variations:
dyggve dyggev dygvge dygveg dygevg dygegv dyggve dyggev dygvge dygveg dygevg
dygegv dyvgge dyvgeg dyvgge dyvgeg dyvegg dyvegg dyegvg dyeggv dyevgg dyevgg
dyegvg dyeggv dgygve dgygev dgyvge dgyveg dgyevg dgyegv dggyve dggyev dggvye
dggvey dggevy dggeyv dgvgye dgvgey dgvyge dgvyeg dgveyg dgvegy dgegvy dgegyv
dgevgy dgevyg dgeyvg dgeygv dggyve dggyev dggvye dggvey dggevy dggeyv dgygve
dgygev dgyvge dgyveg dgyevg dgyegv dgvyge dgvyeg dgvgye dgvgey dgvegy dgveyg
dgeyvg dgeygv dgevyg dgevgy dgegvy dgegyv dvggye dvggey dvgyge dvgyeg dvgeyg
dvgegy dvggye dvggey dvgyge dvgyeg dvgeyg dvgegy dvygge dvygeg dvygge dvygeg
dvyegg dvyegg dvegyg dveggy dveygg dveygg dvegyg dveggy deggvy deggyv degvgy
degvyg degyvg degygv deggvy deggyv degvgy degvyg degyvg degygv devggy devgyg
devggy devgyg devygg devygg deygvg deyggv deyvgg deyvgg deygvg deyggv ydggve
ydggev ydgvge ydgveg ydgevg ydgegv ydggve ydggev ydgvge ydgveg ydgevg ydgegv
ydvgge ydvgeg ydvgge ydvgeg ydvegg ydvegg ydegvg ydeggv ydevgg ydevgg ydegvg
ydeggv ygdgve ygdgev ygdvge ygdveg ygdevg ygdegv yggdve yggdev yggvde yggved
yggevd yggedv ygvgde ygvged ygvdge ygvdeg ygvedg ygvegd ygegvd ygegdv ygevgd
ygevdg ygedvg ygedgv yggdve yggdev yggvde yggved yggevd yggedv ygdgve ygdgev
ygdvge ygdveg ygdevg ygdegv ygvdge ygvdeg ygvgde ygvged ygvegd ygvedg ygedvg
ygedgv ygevdg ygevgd ygegvd ygegdv yvggde yvgged yvgdge yvgdeg yvgedg yvgegd
yvggde yvgged yvgdge yvgdeg yvgedg yvgegd yvdgge yvdgeg yvdgge yvdgeg yvdegg
yvdegg yvegdg yveggd yvedgg yvedgg yvegdg yveggd yeggvd yeggdv yegvgd yegvdg
yegdvg yegdgv yeggvd yeggdv yegvgd yegvdg yegdvg yegdgv yevggd yevgdg yevggd
yevgdg yevdgg yevdgg yedgvg yedggv yedvgg yedvgg yedgvg yedggv gydgve gydgev
gydvge gydveg gydevg gydegv gygdve gygdev gygvde gygved gygevd gygedv gyvgde
gyvged gyvdge gyvdeg gyvedg gyvegd gyegvd gyegdv gyevgd gyevdg gyedvg gyedgv
gdygve gdygev gdyvge gdyveg gdyevg gdyegv gdgyve gdgyev gdgvye gdgvey gdgevy
gdgeyv gdvgye gdvgey gdvyge gdvyeg gdveyg gdvegy gdegvy gdegyv gdevgy gdevyg
gdeyvg gdeygv ggdyve ggdyev ggdvye ggdvey ggdevy ggdeyv ggydve ggydev ggyvde
ggyved ggyevd ggyedv ggvyde ggvyed ggvdye ggvdey ggvedy ggveyd ggeyvd ggeydv
ggevyd ggevdy ggedvy ggedyv gvdgye gvdgey gvdyge gvdyeg gvdeyg gvdegy gvgdye
gvgdey gvgyde gvgyed gvgeyd gvgedy gvygde gvyged gvydge gvydeg gvyedg gvyegd
gvegyd gvegdy gveygd gveydg gvedyg gvedgy gedgvy gedgyv gedvgy gedvyg gedyvg
gedygv gegdvy gegdyv gegvdy gegvyd gegyvd gegydv gevgdy gevgyd gevdgy gevdyg
gevydg gevygd geygvd geygdv geyvgd geyvdg geydvg geydgv gygdve gygdev gygvde
gygved gygevd gygedv gydgve gydgev gydvge gydveg gydevg gydegv gyvdge gyvdeg
gyvgde gyvged gyvegd gyvedg gyedvg gyedgv gyevdg gyevgd gyegvd gyegdv ggydve
ggydev ggyvde ggyved ggyevd ggyedv ggdyve ggdyev ggdvye ggdvey ggdevy ggdeyv
ggvdye ggvdey ggvyde ggvyed ggveyd ggvedy ggedvy ggedyv ggevdy ggevyd ggeyvd
ggeydv gdgyve gdgyev gdgvye gdgvey gdgevy gdgeyv gdygve gdygev gdyvge gdyveg
gdyevg gdyegv gdvyge gdvyeg gdvgye gdvgey gdvegy gdveyg gdeyvg gdeygv gdevyg
gdevgy gdegvy gdegyv gvgdye gvgdey gvgyde gvgyed gvgeyd gvgedy gvdgye gvdgey
gvdyge gvdyeg gvdeyg gvdegy gvydge gvydeg gvygde gvyged gvyegd gvyedg gvedyg
gvedgy gveydg gveygd gvegyd gvegdy gegdvy gegdyv gegvdy gegvyd gegyvd gegydv
gedgvy gedgyv gedvgy gedvyg gedyvg gedygv gevdgy gevdyg gevgdy gevgyd gevygd
gevydg geydvg geydgv geyvdg geyvgd geygvd geygdv vyggde vygged vygdge vygdeg
vygedg vygegd vyggde vygged vygdge vygdeg vygedg vygegd vydgge vydgeg vydgge
vydgeg vydegg vydegg vyegdg vyeggd vyedgg vyedgg vyegdg vyeggd vgygde vgyged
vgydge vgydeg vgyedg vgyegd vggyde vggyed vggdye vggdey vggedy vggeyd vgdgye
vgdgey vgdyge vgdyeg vgdeyg vgdegy vgegdy vgegyd vgedgy vgedyg vgeydg vgeygd
vggyde vggyed vggdye vggdey vggedy vggeyd vgygde vgyged vgydge vgydeg vgyedg
vgyegd vgdyge vgdyeg vgdgye vgdgey vgdegy vgdeyg vgeydg vgeygd vgedyg vgedgy
vgegdy vgegyd vdggye vdggey vdgyge vdgyeg vdgeyg vdgegy vdggye vdggey vdgyge
vdgyeg vdgeyg vdgegy vdygge vdygeg vdygge vdygeg vdyegg vdyegg vdegyg vdeggy
vdeygg vdeygg vdegyg vdeggy veggdy veggyd vegdgy vegdyg vegydg vegygd veggdy
veggyd vegdgy vegdyg vegydg vegygd vedggy vedgyg vedggy vedgyg vedygg vedygg
veygdg veyggd veydgg veydgg veygdg veyggd eyggvd eyggdv eygvgd eygvdg eygdvg
eygdgv eyggvd eyggdv eygvgd eygvdg eygdvg eygdgv eyvggd eyvgdg eyvggd eyvgdg
eyvdgg eyvdgg eydgvg eydggv eydvgg eydvgg eydgvg eydggv egygvd egygdv egyvgd
egyvdg egydvg egydgv eggyvd eggydv eggvyd eggvdy eggdvy eggdyv egvgyd egvgdy
egvygd egvydg egvdyg egvdgy egdgvy egdgyv egdvgy egdvyg egdyvg egdygv eggyvd
eggydv eggvyd eggvdy eggdvy eggdyv egygvd egygdv egyvgd egyvdg egydvg egydgv
egvygd egvydg egvgyd egvgdy egvdgy egvdyg egdyvg egdygv egdvyg egdvgy egdgvy
egdgyv evggyd evggdy evgygd evgydg evgdyg evgdgy evggyd evggdy evgygd evgydg
evgdyg evgdgy evyggd evygdg evyggd evygdg evydgg evydgg evdgyg evdggy evdygg
evdygg evdgyg evdggy edggvy edggyv edgvgy edgvyg edgyvg edgygv edggvy edggyv
edgvgy edgvyg edgyvg edgygv edvggy edvgyg edvggy edvgyg edvygg edvygg edygvg
edyggv edyvgg edyvgg edygvg edyggv

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

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