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Update keyFinder.js

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modified used the suitable identifier for the variables
This commit is contained in:
Wan Cheuk Lun
2018-10-31 09:47:06 +08:00
committed by GitHub
parent 9cabd462ec
commit 6c894a2aa5
1 changed files with 10 additions and 9 deletions
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19
Ciphers/keyFinder.js
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@ -3,23 +3,24 @@ Find and retrieve the encryption key automatically
Note: This is a draft version, please help to modify, Thanks! Note: This is a draft version, please help to modify, Thanks!
******************************************************/ ******************************************************/
function keyFinder(str){ // str is used to get the input of encrypted string 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 const wordbank =["is","Is","am","Am","are","Are","have","Have","has","Has","may","May","be","Be"];
var wordbank =["is","Is","am","Am","are","Are","have","Have","has","Has","may","May","be","Be"]; let key = 0; // return zero means the key can not be found
//var shiftNum = 0; //count the number of key shifted //var shiftNum = 0; //count the number of key shifted
var inStr = str.toString(); //convert the input to String let inStr = str.toString(); //convert the input to String
var outStr = ""; // store the output value let outStr = ""; // store the output value
var wordInOutStr = ""; // temporary store the word inside the outStr, it is used for comparison let wordInOutStr = ""; // temporary store the word inside the outStr, it is used for comparison
//document.getElementById("debug").innerHTML = shiftNum; // debug: display the shifted number(s) //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 for (let 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 outStr = caesarCipherEncodeAndDecodeEngine(inStr,i); // use the encrytpion engine to decrypt the input string, shiftNum=i
for ( var i=0; i<wordbank.length; i++){ for ( let i=0; i<wordbank.length; i++){
// use a loop to find the next digit of wordbank element and compare with outStr's digit // use a loop to find the next digit of wordbank element and compare with outStr's digit
for ( var j=0; j < wordbank[i].length; j++){ for ( let j=0; j < wordbank[i].length; j++){
wordInOutStr += outStr[i+j]; wordInOutStr += outStr[i+j];
} }
// this part need to be optimize with the calculation of the number of occurance of word's probabilities // this part need to be optimize with the calculation of the number of occurance of word's probabilities
// linked list will be used in the next stage of development to calculate the number of occurace of the key
if (wordbank[i] == wordInOutStr){ if (wordbank[i] == wordInOutStr){
key=i; return key=i;
} }
} }
} }