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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
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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: lawlis mbxmjt ibpizd ebhepn abzafx wbrwvh sbjslr kbtkrl gblghv
cbdcxf ybvynp ubnudz qbfqtj ncynku jcqjae fcifqo bcabgy
xcsxwi tcktms lculsm hcmhiw dcedyg zcwzoq vcovea rcgruk
odzolv kdrkbf gdjgrp cdbchz ydtyxj udlunt mdvmtn idnijx
edfezh adxapr wdpwfb sdhsvl peapmw leslcg hekhsq decdia
zeuzyk vemvou newnuo jeojky fegfai beybqs xeqxgc teitwm
qfbqnx mftmdh iflitr efdejb afvazl wfnwpv ofxovp kfpklz
gfhgbj cfzcrt yfryhd ufjuxn rgcroy ngunei jgmjus fgefkc
bgwbam xgoxqw pgypwq lgqlma hgihck dgadsu zgszie vgkvyo
shdspz ohvofj khnkvt ghfgld chxcbn yhpyrx qhzqxr mhrmnb
ihjidl ehbetv ahtajf whlwzp tietqa piwpgk liolwu highme
diydco ziqzsy riarys nisnoc jikjem ficfuw biubkg ximxaq
ujfurb qjxqhl mjpmxv ijhinf ejzedp ajratz sjbszt ojtopd
kjlkfn gjdgvx cjvclh yjnybr vkgvsc rkyrim nkqnyw jkijog
fkafeq bksbua tkctau pkupqe lkmlgo hkehwy dkwdmi zkozcs
wlhwtd slzsjn olrozx kljkph glbgfr cltcvb uldubv qlvqrf
mlnmhp ilfixz elxenj alpadt xmixue tmatko pmspay lmklqi
hmchgs dmudwc vmevcw rmwrsg nmoniq jmgjya fmyfok bmqbeu
ynjyvf unbulp qntqbz mnlmrj indiht envexd wnfwdx snxsth
onpojr knhkzb gnzgpl cnrcfv zokzwg vocvmq rourca nomnsk
joejiu fowfye xogxey toytui poqpks loilac hoahqm dosdgw
aplaxh wpdwnr spvsdb opnotl kpfkjv gpxgzf yphyfz upzuvj
qprqlt mpjmbd ipbirn eptehx bqmbyi xqexos tqwtec pqopum
lqglkw hqyhag zqizga vqavwk rqsrmu nqknce jqcjso fqufiy
crnczj yrfypt urxufd qrpqvn mrhmlx irzibh arjahb wrbwxl
srtsnv orlodf krdktp grvgjz dsodak zsgzqu vsyvge rsqrwo
nsinmy jsajci bskbic xscxym tsutow psmpeg lseluq hswhka
etpebl atharv wtzwhf strsxp otjonz ktbkdj ctlcjd ytdyzn
utvupx qtnqfh mtfmvr itxilb fuqfcm buibsw xuaxig tustyq
pukpoa luclek dumdke zuezao vuwvqy ruorgi nugnws juyjmc
gvrgdn cvjctx yvbyjh uvtuzr qvlqpb mvdmfl evnelf avfabp
wvxwrz svpshj ovhoxt kvzknd hwsheo dwkduy zwczki vwuvas
rwmrqc nwengm fwofmg bwgbcq xwyxsa twqtik pwipyu lwaloe
ixtifp exlevz axdalj wxvwbt sxnsrd oxfohn gxpgnh cxhcdr
yxzytb uxrujl qxjqzv mxbmpf jyujgq fymfwa byebmk xywxcu
tyotse pygpio hyqhoi dyides zyazuc vysvkm rykraw nycnqg
kzvkhr gzngxb czfcnl yzxydv uzputf qzhqjp izripj ezjeft
azbavd wztwln szlsbx ozdorh lawlis haohyc dagdom zayzew
vaqvug rairkq jasjqk fakfgu bacbwe xauxmo tamtcy paepsi
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:
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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.
Basic Form:
Extended Methods: Method #1 Plaintext: lawlis
Method #2 Bifid cipher The message is converted to its coordinates in the usual manner, but they are written vertically beneath: l a w l i s 1 1 2 1 4 3 3 1 5 3 2 4They are then read out in rows: 112143315324 Then divided up into pairs again, and the pairs turned back into letters using the square:
Read more ... Method #3 Plaintext: lawlis
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: lawlis lawlis
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