easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

transistorizing

unenthusiasm

blowback

efficit

taoism

unsanitariness

pyrosulphite

vastaque

magdeburg

unstapled

pulsatur

locabatis

moliremur

curaretis

hannacroix

katun

drivelingly

vitaverisque


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: staigs
cipher variations:
tubjht uvckiu vwdljv wxemkw xyfnlx
yzgomy zahpnz abiqoa bcjrpb cdksqc
deltrd efmuse fgnvtf ghowug hipxvh
ijqywi jkrzxj klsayk lmtbzl mnucam
novdbn opweco pqxfdp qrygeq rszhfr

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: staigs
Cipher: hgzrth

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: staigs
Cipher: BAAAB BAABA AAAAA ABAAA AABBA BAAAB

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: staigs
cipher variations:
tubjhtdgbztdnsbpfnxebfrxhqbvdhrcblprlabrnlvmbhzv
fybxlfpkbnxpzwbdjzjibtvjuvckiuehcaueotcqgoyfcgsy
ircweisdcmqsmbcsomwnciawgzcymgqlcoyqaxcekakjcuwk
vwdljvfidbvfpudrhpzgdhtzjsdxfjtednrtncdtpnxodjbx
hadznhrmdpzrbydflblkdvxlwxemkwgjecwgqvesiqaheiua
kteygkufeosuodeuqoypekcyibeaoisneqasczegmcmlewym
xyfnlxhkfdxhrwftjrbifjvblufzhlvgfptvpefvrpzqfldz
jcfbpjtofrbtdafhndnmfxznyzgomyilgeyisxgukscjgkwc
mvgaimwhgquwqfgwsqargmeakdgcqkupgscuebgioeongyao
zahpnzjmhfzjtyhvltdkhlxdnwhbjnxihrvxrghxtrbshnfb
lehdrlvqhtdvfchjpfpohzbpabiqoaknigakuziwmuelimye
oxickoyjiswyshiyusctiogcmfiesmwriuewgdikqgqpiacq
bcjrpblojhblvajxnvfmjnzfpyjdlpzkjtxztijzvtdujphd
ngjftnxsjvfxhejlrhrqjbdrcdksqcmpkicmwbkyowgnkoag
qzkemqalkuyaujkawuevkqieohkguoytkwgyifkmsisrkces
deltrdnqljdnxclzpxholpbhralfnrbmlvzbvklbxvfwlrjf
pilhvpzulxhzjglntjtsldftefmuseormkeoydmaqyipmqci
sbmgoscnmwacwlmcywgxmskgqjmiwqavmyiakhmoukutmegu
fgnvtfpsnlfpzenbrzjqnrdjtcnhptdonxbdxmndzxhyntlh
rknjxrbwnzjblinpvlvunfhvghowugqtomgqafocsakrosek
udoiquepoyceynoeayizoumislokyscxoakcmjoqwmwvogiw
hipxvhrupnhrbgpdtblsptflvepjrvfqpzdfzopfbzjapvnj
tmplztdypbldnkprxnxwphjxijqywisvqoischqeucmtqugm
wfqkswgrqaegapqgcakbqwokunqmauezqcmeolqsyoyxqiky
jkrzxjtwrpjtdirfvdnurvhnxgrltxhsrbfhbqrhdblcrxpl
vornbvfardnfpmrtzpzyrjlzklsaykuxsqkuejsgweovswio
yhsmuyitscgicrsiecmdsyqmwpsocwgbseogqnsuaqazskma
lmtbzlvytrlvfkthxfpwtxjpzitnvzjutdhjdstjfdnetzrn
xqtpdxhctfphrotvbrbatlnbmnucamwzusmwgluiygqxuykq
ajuowakvueiketukgeofuasoyruqeyidugqispuwcscbumoc
novdbnxavtnxhmvjzhryvzlrbkvpxblwvfjlfuvlhfpgvbtp
zsvrfzjevhrjtqvxdtdcvnpdopwecoybwuoyinwkaiszwams
clwqycmxwgkmgvwmigqhwcuqatwsgakfwiskurwyeuedwoqe
pqxfdpzcxvpzjoxlbjtaxbntdmxrzdnyxhlnhwxnjhrixdvr
buxthblgxjtlvsxzfvfexprfqrygeqadywqakpymckubycou
enysaeozyimoixyokisjyewscvyuicmhykumwtyagwgfyqsg
rszhfrbezxrblqzndlvczdpvfoztbfpazjnpjyzpljtkzfxt
dwzvjdnizlvnxuzbhxhgzrthstaigscfayscmraoemwdaeqw
gpaucgqbakoqkzaqmkulagyuexawkeojamwoyvaciyihasui

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: staigs
Cipher: fgnvtf

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: staigs
Cipher: 344411422234

Extended Methods:
Method #1

Plaintext: staigs
method variations:
xyfomxcdltrchiqywhnovdbn

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
s t a i g s 
3 4 1 4 2 3 
4 4 1 2 2 4 
They are then read out in rows:
341423441224
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: staigs
Cipher: sqmtfr

Read more ...
Method #3

Plaintext: staigs
method variations:
tdqgmo dqgmot qgmotd
gmotdq motdqg otdqgm

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: staigs

all 720 cipher variations:
staigs staisg stagis stagsi stasgi stasig stiags stiasg stigas stigsa stisga
stisag stgias stgisa stgais stgasi stgsai stgsia stsiga stsiag stsgia stsgai
stsagi stsaig satigs satisg satgis satgsi satsgi satsig saitgs saitsg saigts
saigst saisgt saistg sagits sagist sagtis sagtsi sagsti sagsit sasigt sasitg
sasgit sasgti sastgi sastig siatgs siatsg siagts siagst siasgt siastg sitags
sitasg sitgas sitgsa sitsga sitsag sigtas sigtsa sigats sigast sigsat sigsta
sistga sistag sisgta sisgat sisagt sisatg sgaits sgaist sgatis sgatsi sgasti
sgasit sgiats sgiast sgitas sgitsa sgista sgisat sgtias sgtisa sgtais sgtasi
sgtsai sgtsia sgsita sgsiat sgstia sgstai sgsati sgsait ssaigt ssaitg ssagit
ssagti ssatgi ssatig ssiagt ssiatg ssigat ssigta ssitga ssitag ssgiat ssgita
ssgait ssgati ssgtai ssgtia sstiga sstiag sstgia sstgai sstagi sstaig tsaigs
tsaisg tsagis tsagsi tsasgi tsasig tsiags tsiasg tsigas tsigsa tsisga tsisag
tsgias tsgisa tsgais tsgasi tsgsai tsgsia tssiga tssiag tssgia tssgai tssagi
tssaig tasigs tasisg tasgis tasgsi tassgi tassig taisgs taissg taigss taigss
taisgs taissg tagiss tagiss tagsis tagssi tagssi tagsis tasigs tasisg tasgis
tasgsi tassgi tassig tiasgs tiassg tiagss tiagss tiasgs tiassg tisags tisasg
tisgas tisgsa tissga tissag tigsas tigssa tigass tigass tigsas tigssa tissga
tissag tisgsa tisgas tisags tisasg tgaiss tgaiss tgasis tgassi tgassi tgasis
tgiass tgiass tgisas tgissa tgissa tgisas tgsias tgsisa tgsais tgsasi tgssai
tgssia tgsisa tgsias tgssia tgssai tgsasi tgsais tsaigs tsaisg tsagis tsagsi
tsasgi tsasig tsiags tsiasg tsigas tsigsa tsisga tsisag tsgias tsgisa tsgais
tsgasi tsgsai tsgsia tssiga tssiag tssgia tssgai tssagi tssaig atsigs atsisg
atsgis atsgsi atssgi atssig atisgs atissg atigss atigss atisgs atissg atgiss
atgiss atgsis atgssi atgssi atgsis atsigs atsisg atsgis atsgsi atssgi atssig
astigs astisg astgis astgsi astsgi astsig asitgs asitsg asigts asigst asisgt
asistg asgits asgist asgtis asgtsi asgsti asgsit assigt assitg assgit assgti
asstgi asstig aistgs aistsg aisgts aisgst aissgt aisstg aitsgs aitssg aitgss
aitgss aitsgs aitssg aigtss aigtss aigsts aigsst aigsst aigsts aistgs aistsg
aisgts aisgst aissgt aisstg agsits agsist agstis agstsi agssti agssit agists
agisst agitss agitss agists agisst agtiss agtiss agtsis agtssi agtssi agtsis
agsits agsist agstis agstsi agssti agssit assigt assitg assgit assgti asstgi
asstig asisgt asistg asigst asigts asitgs asitsg asgist asgits asgsit asgsti
asgtsi asgtis astigs astisg astgis astgsi astsgi astsig itasgs itassg itagss
itagss itasgs itassg itsags itsasg itsgas itsgsa itssga itssag itgsas itgssa
itgass itgass itgsas itgssa itssga itssag itsgsa itsgas itsags itsasg iatsgs
iatssg iatgss iatgss iatsgs iatssg iastgs iastsg iasgts iasgst iassgt iasstg
iagsts iagsst iagtss iagtss iagsts iagsst iassgt iasstg iasgst iasgts iastgs
iastsg isatgs isatsg isagts isagst isasgt isastg istags istasg istgas istgsa
istsga istsag isgtas isgtsa isgats isgast isgsat isgsta isstga isstag issgta
issgat issagt issatg igasts igasst igatss igatss igasts igasst igsats igsast
igstas igstsa igssta igssat igtsas igtssa igtass igtass igtsas igtssa igssta
igssat igstsa igstas igsats igsast isasgt isastg isagst isagts isatgs isatsg
issagt issatg issgat issgta isstga isstag isgsat isgsta isgast isgats isgtas
isgtsa istsga istsag istgsa istgas istags istasg gtaiss gtaiss gtasis gtassi
gtassi gtasis gtiass gtiass gtisas gtissa gtissa gtisas gtsias gtsisa gtsais
gtsasi gtssai gtssia gtsisa gtsias gtssia gtssai gtsasi gtsais gatiss gatiss
gatsis gatssi gatssi gatsis gaitss gaitss gaists gaisst gaisst gaists gasits
gasist gastis gastsi gassti gassit gasist gasits gassit gassti gastsi gastis
giatss giatss giasts giasst giasst giasts gitass gitass gitsas gitssa gitssa
gitsas gistas gistsa gisats gisast gissat gissta gistsa gistas gissta gissat
gisast gisats gsaits gsaist gsatis gsatsi gsasti gsasit gsiats gsiast gsitas
gsitsa gsista gsisat gstias gstisa gstais gstasi gstsai gstsia gssita gssiat
gsstia gsstai gssati gssait gsaist gsaits gsasit gsasti gsatsi gsatis gsiast
gsiats gsisat gsista gsitsa gsitas gssiat gssita gssait gssati gsstai gsstia
gstisa gstias gstsia gstsai gstasi gstais staigs staisg stagis stagsi stasgi
stasig stiags stiasg stigas stigsa stisga stisag stgias stgisa stgais stgasi
stgsai stgsia stsiga stsiag stsgia stsgai stsagi stsaig satigs satisg satgis
satgsi satsgi satsig saitgs saitsg saigts saigst saisgt saistg sagits sagist
sagtis sagtsi sagsti sagsit sasigt sasitg sasgit sasgti sastgi sastig siatgs
siatsg siagts siagst siasgt siastg sitags sitasg sitgas sitgsa sitsga sitsag
sigtas sigtsa sigats sigast sigsat sigsta sistga sistag sisgta sisgat sisagt
sisatg sgaits sgaist sgatis sgatsi sgasti sgasit sgiats sgiast sgitas sgitsa
sgista sgisat sgtias sgtisa sgtais sgtasi sgtsai sgtsia sgsita sgsiat sgstia
sgstai sgsati sgsait ssaigt ssaitg ssagit ssagti ssatgi ssatig ssiagt ssiatg
ssigat ssigta ssitga ssitag ssgiat ssgita ssgait ssgati ssgtai ssgtia sstiga
sstiag sstgia sstgai sstagi sstaig

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

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