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Merged
merged 5 commits into from
Oct 30, 2018
Merged

Create keyFinder.js #78

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6331056
Create keyFinder
winsonrich Oct 25, 2018
5a75bca
Rename keyFinder to keyFinder.js
winsonrich Oct 27, 2018
e0fa99b
Update keyFinder.js
winsonrich Oct 27, 2018
e41ad76
Update keyFinder.js
winsonrich Oct 27, 2018
7a04d2a
Update keyFinder.js
winsonrich Oct 30, 2018
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21 changes: 21 additions & 0 deletions Ciphers/keyFinder.js
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Original file line number Diff line number Diff line change
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/******************************************************
Find and retrieve the encryption key automatically
Note: This is a draft version, please help to modify, Thanks!
******************************************************/
function keyFinder(str){ // str is used to get the input of encrypted string
var key = 0; // return zero means the key can not be found
var wordbank =["is","Is","am","Am","are","Are","have","Have","has","Has","may","May","be","Be"];
//var shiftNum = 0; //count the number of key shifted
var inStr = str.toString(); //convert the input to String
var outStr = ""; // store the output value
//document.getElementById("debug").innerHTML = shiftNum; // debug: display the shifted number(s)
for (var i=0; i<(52); i++){ //try the number of key shifted, the sum of character from a-z and A-Z is 26*2=52
outStr = caesarCipherEncodeAndDecodeEngine(inStr,i); // use the encrytpion engine to decrypt the input string, shiftNum=i
for ( var i=0; i<wordbank.length; i++){
if (wordbank[i] == outStr[i]+outStr[i+1]{
key=i;
}
}
}
return key;
}