easy ciphers

Easy Ciphers Tools:
cryptography lectures
popular ciphers:

caramilk

viennenis

ipomoeae

hpautoc

dispractice

thomasser

dasyphyllous

uddered

memsahibs

constiteratis

merotropism

griffinish

murva

katzenjammer

blobbing

jemezsprings

troyius

audiatque


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: firiki
cipher variations:
gjsjlj hktkmk ilulnl jmvmom knwnpn
loxoqo mpyprp nqzqsq orartr psbsus
qtctvt ruduwu svevxv twfwyw uxgxzx
vyhyay wzizbz xajaca ybkbdb zclcec
admdfd benege cfofhf dgpgig ehqhjh

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: firiki
Cipher: urirpr

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: firiki
Cipher: AABAB ABAAA BAAAA ABAAA ABAAB ABAAA

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: firiki
cipher variations:
gjsjljqzazfzapipzpkfqftfuvyvnvelglhlyrwrvrihehph
sxmxjxcnundnmdcdxdwtktrthktkmkrabagabqjqaqlgrgug
vwzwowfmhmimzsxswsjifiqitynykydovoeonedeyexulusu
ilulnlsbcbhbcrkrbrmhshvhwxaxpxgninjnatytxtkjgjrj
uzozlzepwpfpofefzfyvmvtvjmvmomtcdcicdslscsnitiwi
xybyqyhojokobuzuyulkhkskvapamafqxqgqpgfgagzwnwuw
knwnpnudedjdetmtdtojujxjyzczrzipkplpcvavzvmliltl
wbqbnbgryrhrqhghbhaxoxvxloxoqovefekefunueupkvkyk
zadasajqlqmqdwbwawnmjmumxcrcochszsisrihicibypywy
mpyprpwfgflfgvovfvqlwlzlabebtbkrmrnrexcxbxonknvn
ydsdpditatjtsjijdjczqzxznqzqsqxghgmghwpwgwrmxmam
bcfcuclsnsosfydycypolowozeteqejubukutkjkekdaraya
orartryhihnhixqxhxsnynbncdgdvdmtotptgzezdzqpmpxp
afufrfkvcvlvulklflebsbzbpsbsuszijioijyryiytozoco
dehewenupuquhafaearqnqyqbgvgsglwdwmwvmlmgmfctcac
qtctvtajkjpjkzszjzupapdpefifxfovqvrvibgbfbsrorzr
chwhthmxexnxwnmnhngdudbdruduwubklkqklatakavqbqeq
fgjgygpwrwswjchcgctspsasdixiuinyfyoyxonoiohevece
svevxvclmlrlmbublbwrcrfrghkhzhqxsxtxkdidhdutqtbt
ejyjvjozgzpzypopjpifwfdftwfwywdmnmsmncvcmcxsdsgs
hiliairytyuylejeievurucufkzkwkpahaqazqpqkqjgxgeg
uxgxzxenontnodwdndytethtijmjbjszuzvzmfkfjfwvsvdv
glalxlqbibrbarqrlrkhyhfhvyhyayfopouopexeoezufuiu
jknkcktavawanglgkgxwtwewhmbmymrcjcscbsrsmslizigi
wzizbzgpqpvpqfyfpfavgvjvkloldlubwbxbohmhlhyxuxfx
incnznsdkdtdctstntmjajhjxajacahqrqwqrgzgqgbwhwkw
lmpmemvcxcycpinimizyvygyjodoaoteleuedutuounkbkik
ybkbdbirsrxrshahrhcxixlxmnqnfnwdydzdqjojnjazwzhz
kpepbpufmfvfevuvpvolcljlzclcecjstsystibisidyjymy
norogoxezeaerkpkokbaxaialqfqcqvgngwgfwvwqwpmdmkm
admdfdktutztujcjtjezkznzopsphpyfafbfslqlplcbybjb
mrgrdrwhohxhgxwxrxqnenlnbenegeluvuauvkdkukfalaoa
pqtqiqzgbgcgtmrmqmdczckcnshsesxipiyihyxysyrofomo
cfofhfmvwvbvwlelvlgbmbpbqrurjrahchdhunsnrnedadld
otitftyjqjzjizyztzspgpnpdgpgignwxwcwxmfmwmhcncqc
rsvsksbidieivotosofebemepujuguzkrkakjazauatqhqoq
ehqhjhoxyxdxyngnxnidodrdstwtltcjejfjwpuptpgfcfnf
qvkvhvalslblkbabvburirprfirikipyzyeyzohoyojepese
tuxumudkfkgkxqvquqhgdgogrwlwiwbmtmcmlcbcwcvsjsqs

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: firiki
Cipher: svevxv

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: firiki
Cipher: 124224425242

Extended Methods:
Method #1

Plaintext: firiki
method variations:
lowopoqtbtutvygyzyadmded

Method #2
Bifid cipher
The message is converted to its coordinates in the usual manner, but they are written vertically beneath:
f i r i k i 
1 4 2 4 5 4 
2 2 4 2 2 2 
They are then read out in rows:
142454224222
Then divided up into pairs again, and the pairs turned back into letters using the square:
Plain: firiki
Cipher: qrugig

Read more ...
Method #3

Plaintext: firiki
method variations:
rgtwrb gtwrbr twrbrg
wrbrgt rbrgtw brgtwr

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: firiki

all 720 cipher variations:
firiki firiik firkii firkii firiki firiik fiirki fiirik fiikri fiikir fiiikr
fiiirk fikiri fikiir fikrii fikrii fikiri fikiir fiiikr fiiirk fiikir fiikri
fiirki fiirik friiki friiik frikii frikii friiki friiik friiki friiik frikii
frikii friiki friiik frkiii frkiii frkiii frkiii frkiii frkiii friiki friiik
frikii frikii friiki friiik firiki firiik firkii firkii firiki firiik fiirki
fiirik fiikri fiikir fiiikr fiiirk fikiri fikiir fikrii fikrii fikiri fikiir
fiiikr fiiirk fiikir fiikri fiirki fiirik fkriii fkriii fkriii fkriii fkriii
fkriii fkirii fkirii fkiiri fkiiir fkiiir fkiiri fkiiri fkiiir fkirii fkirii
fkiiri fkiiir fkiiir fkiiri fkiiir fkiiri fkirii fkirii firiki firiik firkii
firkii firiki firiik fiirki fiirik fiikri fiikir fiiikr fiiirk fikiri fikiir
fikrii fikrii fikiri fikiir fiiikr fiiirk fiikir fiikri fiirki fiirik ifriki
ifriik ifrkii ifrkii ifriki ifriik ifirki ifirik ifikri ifikir ifiikr ifiirk
ifkiri ifkiir ifkrii ifkrii ifkiri ifkiir ifiikr ifiirk ifikir ifikri ifirki
ifirik irfiki irfiik irfkii irfkii irfiki irfiik irifki irifik irikfi irikif
iriikf iriifk irkifi irkiif irkfii irkfii irkifi irkiif iriikf iriifk irikif
irikfi irifki irifik iirfki iirfik iirkfi iirkif iirikf iirifk iifrki iifrik
iifkri iifkir iifikr iifirk iikfri iikfir iikrfi iikrif iikirf iikifr iiifkr
iiifrk iiikfr iiikrf iiirkf iiirfk ikrifi ikriif ikrfii ikrfii ikrifi ikriif
ikirfi ikirif ikifri ikifir ikiifr ikiirf ikfiri ikfiir ikfrii ikfrii ikfiri
ikfiir ikiifr ikiirf ikifir ikifri ikirfi ikirif iirikf iirifk iirkif iirkfi
iirfki iirfik iiirkf iiirfk iiikrf iiikfr iiifkr iiifrk iikirf iikifr iikrif
iikrfi iikfri iikfir iifikr iifirk iifkir iifkri iifrki iifrik rifiki rifiik
rifkii rifkii rifiki rifiik riifki riifik riikfi riikif riiikf riiifk rikifi
rikiif rikfii rikfii rikifi rikiif riiikf riiifk riikif riikfi riifki riifik
rfiiki rfiiik rfikii rfikii rfiiki rfiiik rfiiki rfiiik rfikii rfikii rfiiki
rfiiik rfkiii rfkiii rfkiii rfkiii rfkiii rfkiii rfiiki rfiiik rfikii rfikii
rfiiki rfiiik rifiki rifiik rifkii rifkii rifiki rifiik riifki riifik riikfi
riikif riiikf riiifk rikifi rikiif rikfii rikfii rikifi rikiif riiikf riiifk
riikif riikfi riifki riifik rkfiii rkfiii rkfiii rkfiii rkfiii rkfiii rkifii
rkifii rkiifi rkiiif rkiiif rkiifi rkiifi rkiiif rkifii rkifii rkiifi rkiiif
rkiiif rkiifi rkiiif rkiifi rkifii rkifii rifiki rifiik rifkii rifkii rifiki
rifiik riifki riifik riikfi riikif riiikf riiifk rikifi rikiif rikfii rikfii
rikifi rikiif riiikf riiifk riikif riikfi riifki riifik iirfki iirfik iirkfi
iirkif iirikf iirifk iifrki iifrik iifkri iifkir iifikr iifirk iikfri iikfir
iikrfi iikrif iikirf iikifr iiifkr iiifrk iiikfr iiikrf iiirkf iiirfk irifki
irifik irikfi irikif iriikf iriifk irfiki irfiik irfkii irfkii irfiki irfiik
irkfii irkfii irkifi irkiif irkiif irkifi irifki irifik irikfi irikif iriikf
iriifk ifriki ifriik ifrkii ifrkii ifriki ifriik ifirki ifirik ifikri ifikir
ifiikr ifiirk ifkiri ifkiir ifkrii ifkrii ifkiri ifkiir ifiikr ifiirk ifikir
ifikri ifirki ifirik ikrfii ikrfii ikrifi ikriif ikriif ikrifi ikfrii ikfrii
ikfiri ikfiir ikfiir ikfiri ikifri ikifir ikirfi ikirif ikiirf ikiifr ikifir
ikifri ikiifr ikiirf ikirif ikirfi iirfki iirfik iirkfi iirkif iirikf iirifk
iifrki iifrik iifkri iifkir iifikr iifirk iikfri iikfir iikrfi iikrif iikirf
iikifr iiifkr iiifrk iiikfr iiikrf iiirkf iiirfk kirifi kiriif kirfii kirfii
kirifi kiriif kiirfi kiirif kiifri kiifir kiiifr kiiirf kifiri kifiir kifrii
kifrii kifiri kifiir kiiifr kiiirf kiifir kiifri kiirfi kiirif kriifi kriiif
krifii krifii kriifi kriiif kriifi kriiif krifii krifii kriifi kriiif krfiii
krfiii krfiii krfiii krfiii krfiii kriifi kriiif krifii krifii kriifi kriiif
kirifi kiriif kirfii kirfii kirifi kiriif kiirfi kiirif kiifri kiifir kiiifr
kiiirf kifiri kifiir kifrii kifrii kifiri kifiir kiiifr kiiirf kiifir kiifri
kiirfi kiirif kfriii kfriii kfriii kfriii kfriii kfriii kfirii kfirii kfiiri
kfiiir kfiiir kfiiri kfiiri kfiiir kfirii kfirii kfiiri kfiiir kfiiir kfiiri
kfiiir kfiiri kfirii kfirii kirifi kiriif kirfii kirfii kirifi kiriif kiirfi
kiirif kiifri kiifir kiiifr kiiirf kifiri kifiir kifrii kifrii kifiri kifiir
kiiifr kiiirf kiifir kiifri kiirfi kiirif iirikf iirifk iirkif iirkfi iirfki
iirfik iiirkf iiirfk iiikrf iiikfr iiifkr iiifrk iikirf iikifr iikrif iikrfi
iikfri iikfir iifikr iifirk iifkir iifkri iifrki iifrik iriikf iriifk irikif
irikfi irifki irifik iriikf iriifk irikif irikfi irifki irifik irkiif irkifi
irkiif irkifi irkfii irkfii irfiki irfiik irfkii irfkii irfiki irfiik iirikf
iirifk iirkif iirkfi iirfki iirfik iiirkf iiirfk iiikrf iiikfr iiifkr iiifrk
iikirf iikifr iikrif iikrfi iikfri iikfir iifikr iifirk iifkir iifkri iifrki
iifrik ikriif ikrifi ikriif ikrifi ikrfii ikrfii ikirif ikirfi ikiirf ikiifr
ikifir ikifri ikiirf ikiifr ikirif ikirfi ikifri ikifir ikfiir ikfiri ikfiir
ikfiri ikfrii ikfrii ifriki ifriik ifrkii ifrkii ifriki ifriik ifirki ifirik
ifikri ifikir ifiikr ifiirk ifkiri ifkiir ifkrii ifkrii ifkiri ifkiir ifiikr
ifiirk ifikir ifikri ifirki ifirik

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

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