The JavaScript Source: Password Protection: Slide Encryption Program

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Password Protection

Slide Encryption Program

This is another basic encryption/decryption program. The difference is this script can shift characters based on user input and you can use more than one key making your security even more difficult to break.

The JavaScript Source: Password Protection: Slide Encryption Program
Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Command-s). The script is yours!!!

  <HEAD>     <script language="javascript"> /* Slide Encryption Program Written by Brett Tolbert. You can contact me at bretttolbert@alaweb.com Use this program freely, just leave this comment untouched. This program works by searching for each character in the char_set variable and sliding that character based on the number in the pull down select. */ var char_set = '$%^NOZ1&PQR(./~`"CDEFG!@STUVWZghij}:<pHB*#8uvwx>?[]\',ef34590qrklmnoIJ)_+{st67 abcdAyzKLM2Y'; function encrypt_data() { var input = window.input.input_field.value; var output = ""; var char_code; //get algorithm from pull down select var algorithm = window.input.shift_select.selectedIndex; algorithm++; var alpha_length = char_set.length - algorithm; var space; //begin for loop to cycle through input for (loop=0; loop<input.length; loop++) { //if conditional detects unknown characters if (char_set.indexOf(input.charAt(loop)) == -1) { alert("Program Error: Unknown Character!"); } //search char_set string for character and set char_code variable... char_code = char_set.indexOf(input.charAt(loop)); //actual text encoding algorithm goes here if (char_code + algorithm > char_set.length) { space = char_set.length - char_code; char_code = algorithm - space; } else { char_code += algorithm; } //set output variable in accordance to char_set output += char_set.charAt(char_code); } //dump contents of output variable into textarea window.input.input_field.value = output; } function decrypt_data() { var input = window.input.input_field.value; var output = ""; var char_code; //get algorithm from pull down select var algorithm = window.input.shift_select.selectedIndex; algorithm++; var alpha_length = char_set.length - algorithm; var space; //begin for loop to cycle through input for (loop=0; loop<input.length; loop++) { //if conditional detects unknown characters if (char_set.indexOf(input.charAt(loop)) == -1) { alert("Program Error: Unknown Character!"); } //search char_set string for character and set char_code variable... char_code = char_set.indexOf(input.charAt(loop)); //oppisite of encrypt algorithm goes here if (char_code - algorithm < 0) { space = algorithm - char_code; char_code = char_set.length - space; } else { char_code -= algorithm; } //set output variable in accordance to char_set output += char_set.charAt(char_code); } //dump contents of output variable into textarea window.input.input_field.value = output; } </script> </HEAD>  <BODY>     <form name="input"> <TEXTAREA name="input_field" style="WIDTH: 95%; HEIGHT: 300px"> </TEXTAREA> <center> <b>Key: </b> <select name="shift_select"> <option>1 <option>2 <option>3 <option>4 <option selected>5 <option>6 <option>7 <option>8 <option>9 </select> <input type="button" name="encrypt" value="EnCrypt" onclick="encrypt_data();"> <input type="button" name="decrypt" value="DeCrypt" onclick="decrypt_data();"> </center> </form> <p><center> <font face="arial, helvetica" size"-2">Free JavaScripts provided<br> by <a href="http://javascriptsource.com">The JavaScript Source</a></font> </center><p> 
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