easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

jugulated

unassignable

communissesque

cheders

halterman

parotia

thiostreptone

slaveholding

moonflower

noyau

unqualifying

hedren

praesumpresum

flecteruntque

overrefining

aegithognathism

povera

miraretur


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: halsam
cipher variations:
ibmtbn jcnuco kdovdp lepweq mfqxfr
ngrygs ohszht pitaiu qjubjv rkvckw
slwdlx tmxemy unyfnz vozgoa wpahpb
xqbiqc yrcjrd zsdkse ateltf bufmug
cvgnvh dwhowi exipxj fyjqyk gzkrzl

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: halsam
Cipher: szohzn

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: halsam
Cipher: AABBB AAAAA ABABA BAAAB AAAAA ABABB

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: halsam
cipher variations:
ibmtbnwbidblkbenbjybaxbhmbwhbfabsrbdcbklbzqbgvbx
ebcfbvsbypbtgbuzbrubqjbpjcnucoxcjecmlcfockzcbyci
ncxicgbctscedclmcarchwcyfcdgcwtczqcuhcvacsvcrkcq
kdovdpydkfdnmdgpdladczdjodyjdhcdutdfedmndbsdixdz
gdehdxudardvidwbdtwdsldrlepweqzelgeonehqembedaek
pezkeidevuegfenoectejyeahefieyvebsewjexceuxetmes
mfqxfrafmhfpofirfncfebflqfalfjefwvfhgfopfdufkzfb
ifgjfzwfctfxkfydfvyfunftngrygsbgnigqpgjsgodgfcgm
rgbmgkfgxwgihgpqgevglagcjghkgaxgdugylgzegwzgvogu
ohszhtchojhrqhkthpehgdhnshcnhlghyxhjihqrhfwhmbhd
khilhbyhevhzmhafhxahwphvpitaiudipkisriluiqfiheio
tidoimhizyikjirsigxincielijmiczifwianibgiybixqiw
qjubjvejqljtsjmvjrgjifjpujepjnijazjlkjstjhyjodjf
mjknjdajgxjbojchjzcjyrjxrkvckwfkrmkutknwkshkjgkq
vkfqkojkbakmlktukizkpekgnklokebkhykcpkdikadkzsky
slwdlxglsnlvuloxltilkhlrwlgrlpklcblnmluvljalqflh
olmplfclizldqlejlbelatlztmxemyhmtomwvmpymujmlims
xmhsmqlmdcmonmvwmkbmrgmipmnqmgdmjamermfkmcfmbuma
unyfnzinupnxwnqznvknmjntynitnrmnednponwxnlcnshnj
qnornhenkbnfsnglndgncvnbvozgoajovqoyxoraowlonkou
zojuosnofeoqpoxyomdotiokropsoifolcogtohmoehodwoc
wpahpbkpwrpzypsbpxmpolpvapkvptopgfprqpyzpnepujpl
spqtpjgpmdphupinpfipexpdxqbiqclqxsqazqtcqynqpmqw
bqlwqupqhgqsrqzaqofqvkqmtqruqkhqneqivqjoqgjqfyqe
yrcjrdmrytrbarudrzorqnrxcrmxrvqrihrtsrabrpgrwlrn
ursvrlirofrjwrkprhkrgzrfzsdksenszuscbsvesapsrosy
dsnyswrsjisutsbcsqhsxmsovstwsmjspgskxslqsilshasg
ateltfotavtdctwftbqtsptzetoztxstkjtvutcdtrityntp
wtuxtnktqhtlytmrtjmtibthbufmugpubwueduxgucrutqua
fupauytulkuwvudeusjuzouqxuvyuoluriumzunsuknujcui
cvgnvhqvcxvfevyhvdsvurvbgvqbvzuvmlvxwvefvtkvapvr
yvwzvpmvsjvnavotvlovkdvjdwhowirwdywgfwziwetwvswc
hwrcwavwnmwyxwfgwulwbqwszwxawqnwtkwobwpuwmpwlewk
exipxjsxezxhgxajxfuxwtxdixsdxbwxonxzyxghxvmxcrxt
axybxroxulxpcxqvxnqxmfxlfyjqyktyfayihybkygvyxuye
jyteycxypoyazyhiywnydsyubyzcyspyvmyqdyrwyoryngym
gzkrzluzgbzjizclzhwzyvzfkzufzdyzqpzbazijzxozetzv
czadztqzwnzrezsxzpszohznhalsamvahcakjadmaixazwag
lavgaezarqacbajkaypafuawdabeauraxoasfatyaqtapiao

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: halsam
Cipher: unyfnz

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: halsam
Cipher: 321113341123

Extended Methods:
Method #1

Plaintext: halsam
method variations:
nfqxfrslvclwxqahqbcvfnvg

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
h a l s a m 
3 1 1 3 1 2 
2 1 3 4 1 3 
They are then read out in rows:
311312213413
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: halsam
Cipher: clfbsl

Read more ...
Method #3

Plaintext: halsam
method variations:
bandfn andfnb ndfnba
dfnban fnband nbandf

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: halsam

all 720 cipher variations:
halsam halsma halasm halams halmas halmsa haslam haslma hasalm hasaml hasmal
hasmla haaslm haasml haalsm haalms haamls haamsl hamsal hamsla hamasl hamals
hamlas hamlsa hlasam hlasma hlaasm hlaams hlamas hlamsa hlsaam hlsama hlsaam
hlsama hlsmaa hlsmaa hlasam hlasma hlaasm hlaams hlamas hlamsa hlmsaa hlmsaa
hlmasa hlmaas hlmaas hlmasa hslaam hslama hslaam hslama hslmaa hslmaa hsalam
hsalma hsaalm hsaaml hsamal hsamla hsaalm hsaaml hsalam hsalma hsamla hsamal
hsmaal hsmala hsmaal hsmala hsmlaa hsmlaa halsam halsma halasm halams halmas
halmsa haslam haslma hasalm hasaml hasmal hasmla haaslm haasml haalsm haalms
haamls haamsl hamsal hamsla hamasl hamals hamlas hamlsa hmlsaa hmlsaa hmlasa
hmlaas hmlaas hmlasa hmslaa hmslaa hmsala hmsaal hmsaal hmsala hmasla hmasal
hmalsa hmalas hmaals hmaasl hmasal hmasla hmaasl hmaals hmalas hmalsa ahlsam
ahlsma ahlasm ahlams ahlmas ahlmsa ahslam ahslma ahsalm ahsaml ahsmal ahsmla
ahaslm ahasml ahalsm ahalms ahamls ahamsl ahmsal ahmsla ahmasl ahmals ahmlas
ahmlsa alhsam alhsma alhasm alhams alhmas alhmsa alsham alshma alsahm alsamh
alsmah alsmha alashm alasmh alahsm alahms alamhs alamsh almsah almsha almash
almahs almhas almhsa aslham aslhma aslahm aslamh aslmah aslmha ashlam ashlma
ashalm ashaml ashmal ashmla asahlm asahml asalhm asalmh asamlh asamhl asmhal
asmhla asmahl asmalh asmlah asmlha aalshm aalsmh aalhsm aalhms aalmhs aalmsh
aaslhm aaslmh aashlm aashml aasmhl aasmlh aahslm aahsml aahlsm aahlms aahmls
aahmsl aamshl aamslh aamhsl aamhls aamlhs aamlsh amlsah amlsha amlash amlahs
amlhas amlhsa amslah amslha amsalh amsahl amshal amshla amaslh amashl amalsh
amalhs amahls amahsl amhsal amhsla amhasl amhals amhlas amhlsa lahsam lahsma
lahasm lahams lahmas lahmsa lasham lashma lasahm lasamh lasmah lasmha laashm
laasmh laahsm laahms laamhs laamsh lamsah lamsha lamash lamahs lamhas lamhsa
lhasam lhasma lhaasm lhaams lhamas lhamsa lhsaam lhsama lhsaam lhsama lhsmaa
lhsmaa lhasam lhasma lhaasm lhaams lhamas lhamsa lhmsaa lhmsaa lhmasa lhmaas
lhmaas lhmasa lshaam lshama lshaam lshama lshmaa lshmaa lsaham lsahma lsaahm
lsaamh lsamah lsamha lsaahm lsaamh lsaham lsahma lsamha lsamah lsmaah lsmaha
lsmaah lsmaha lsmhaa lsmhaa lahsam lahsma lahasm lahams lahmas lahmsa lasham
lashma lasahm lasamh lasmah lasmha laashm laasmh laahsm laahms laamhs laamsh
lamsah lamsha lamash lamahs lamhas lamhsa lmhsaa lmhsaa lmhasa lmhaas lmhaas
lmhasa lmshaa lmshaa lmsaha lmsaah lmsaah lmsaha lmasha lmasah lmahsa lmahas
lmaahs lmaash lmasah lmasha lmaash lmaahs lmahas lmahsa salham salhma salahm
salamh salmah salmha sahlam sahlma sahalm sahaml sahmal sahmla saahlm saahml
saalhm saalmh saamlh saamhl samhal samhla samahl samalh samlah samlha slaham
slahma slaahm slaamh slamah slamha slhaam slhama slhaam slhama slhmaa slhmaa
slaham slahma slaahm slaamh slamah slamha slmhaa slmhaa slmaha slmaah slmaah
slmaha shlaam shlama shlaam shlama shlmaa shlmaa shalam shalma shaalm shaaml
shamal shamla shaalm shaaml shalam shalma shamla shamal shmaal shmala shmaal
shmala shmlaa shmlaa salham salhma salahm salamh salmah salmha sahlam sahlma
sahalm sahaml sahmal sahmla saahlm saahml saalhm saalmh saamlh saamhl samhal
samhla samahl samalh samlah samlha smlhaa smlhaa smlaha smlaah smlaah smlaha
smhlaa smhlaa smhala smhaal smhaal smhala smahla smahal smalha smalah smaalh
smaahl smahal smahla smaahl smaalh smalah smalha aalshm aalsmh aalhsm aalhms
aalmhs aalmsh aaslhm aaslmh aashlm aashml aasmhl aasmlh aahslm aahsml aahlsm
aahlms aahmls aahmsl aamshl aamslh aamhsl aamhls aamlhs aamlsh alashm alasmh
alahsm alahms alamhs alamsh alsahm alsamh alsham alshma alsmha alsmah alhsam
alhsma alhasm alhams alhmas alhmsa almsha almsah almhsa almhas almahs almash
aslahm aslamh aslham aslhma aslmha aslmah asalhm asalmh asahlm asahml asamhl
asamlh ashalm ashaml ashlam ashlma ashmla ashmal asmahl asmalh asmhal asmhla
asmlha asmlah ahlsam ahlsma ahlasm ahlams ahlmas ahlmsa ahslam ahslma ahsalm
ahsaml ahsmal ahsmla ahaslm ahasml ahalsm ahalms ahamls ahamsl ahmsal ahmsla
ahmasl ahmals ahmlas ahmlsa amlsha amlsah amlhsa amlhas amlahs amlash amslha
amslah amshla amshal amsahl amsalh amhsla amhsal amhlsa amhlas amhals amhasl
amashl amaslh amahsl amahls amalhs amalsh malsah malsha malash malahs malhas
malhsa maslah maslha masalh masahl mashal mashla maaslh maashl maalsh maalhs
maahls maahsl mahsal mahsla mahasl mahals mahlas mahlsa mlasah mlasha mlaash
mlaahs mlahas mlahsa mlsaah mlsaha mlsaah mlsaha mlshaa mlshaa mlasah mlasha
mlaash mlaahs mlahas mlahsa mlhsaa mlhsaa mlhasa mlhaas mlhaas mlhasa mslaah
mslaha mslaah mslaha mslhaa mslhaa msalah msalha msaalh msaahl msahal msahla
msaalh msaahl msalah msalha msahla msahal mshaal mshala mshaal mshala mshlaa
mshlaa malsah malsha malash malahs malhas malhsa maslah maslha masalh masahl
mashal mashla maaslh maashl maalsh maalhs maahls maahsl mahsal mahsla mahasl
mahals mahlas mahlsa mhlsaa mhlsaa mhlasa mhlaas mhlaas mhlasa mhslaa mhslaa
mhsala mhsaal mhsaal mhsala mhasla mhasal mhalsa mhalas mhaals mhaasl mhasal
mhasla mhaasl mhaals mhalas mhalsa

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

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