function Encrypt(str, pwd) {
        if(str=="")return "";
        str = escape(str);
        if(!pwd || pwd==""){ var pwd="1234"; }
        pwd = escape(pwd);
          if(pwd == null || pwd.length <= 0) {
            alert("Please enter a password with which to encrypt the message.");
              return null;
          }
          var prand = "";
          for(var I=0; I<pwd.length; I++) {
            prand += pwd.charCodeAt(I).toString();
          }
          var sPos = Math.floor(prand.length / 5);
          var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos*2) + prand.charAt(sPos*3) + prand.charAt(sPos*4) + prand.charAt(sPos*5));

          var incr = Math.ceil(pwd.length / 2);
          var modu = Math.pow(2, 31) - 1;
          if(mult < 2) {
            alert("Algorithm cannot find a suitable hash. Please choose a different password. \nPossible considerations are to choose a more complex or longer password.");
            return null;
          }
          var salt = Math.round(Math.random() * 1000000000) % 100000000;
          prand += salt;
          while(prand.length > 10) {
            prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
          }
          prand = (mult * prand + incr) % modu;
        var enc_chr = "";
        var enc_str = "";
        for(var I=0; I<str.length; I++) {
            enc_chr = parseInt(str.charCodeAt(I) ^ Math.floor((prand / modu) * 255));
            if(enc_chr < 16) {
                enc_str += "0" + enc_chr.toString(16);
            }else 
                enc_str += enc_chr.toString(16);
            prand = (mult * prand + incr) % modu;
        }
          salt = salt.toString(16);
          while(salt.length < 8)salt = "0" + salt;
        enc_str += salt;
        return enc_str;
    }

    function Decrypt(str, pwd) {
        if(str=="")return "";
        if(!pwd || pwd==""){ var pwd="1234"; }
        pwd = escape(pwd);
          if(str == null || str.length < 8) {
            alert("A salt value could not be extracted from the encrypted message because it's length is too short. The message cannot be decrypted.");
            return;
          }
          if(pwd == null || pwd.length <= 0) {
            alert("Please enter a password with which to decrypt the message.");
            return;
          }
          var prand = "";
          for(var I=0; I<pwd.length; I++) {
            prand += pwd.charCodeAt(I).toString();
          }
          var sPos = Math.floor(prand.length / 5);
          var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos*2) + prand.charAt(sPos*3) + prand.charAt(sPos*4) + prand.charAt(sPos*5));
          var incr = Math.round(pwd.length / 2);
          var modu = Math.pow(2, 31) - 1;
          var salt = parseInt(str.substring(str.length - 8, str.length), 16);
          str = str.substring(0, str.length - 8);
          prand += salt;
          while(prand.length > 10) {
            prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
          }
          prand = (mult * prand + incr) % modu;
          var enc_chr = "";
          var enc_str = "";
        for(var I=0; I<str.length; I+=2) {
            enc_chr = parseInt(parseInt(str.substring(I, I+2), 16) ^ Math.floor((prand / modu) * 255));
            enc_str += String.fromCharCode(enc_chr);
            prand = (mult * prand + incr) % modu;
        }
        return unescape(enc_str);
    }