Formlen for encrypt er: E(x) = (ax + b) mod n <br>
Da jeg bruger 26 karakterer a-z er n = 26 (dvs fra 0=a - 25=z)<br>
Vær opmærksom på at scriptet konvereterer store bogstaver til små bogstaver. Derudover fjerner jeg \n og " " karakterer<br>
<form action="?action=encrypt" method="post">
Vælg a:<select name="a">
<option value="1">1</option>
<option value="3">3</option>
<option value="5">5</option>
<option value="7">7</option>
<option value="9">9</option>
<option value="11">11</option>
<option value="15">15</option>
<option value="17">17</option>
<option value="19">19</option>
<option value="21">21</option>
<option value="23">23</option>
<option value="25">25</option>
</select>
Vælg b:
<select name="b">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
<option value=4>4</option>
<option value=5>5</option>
<option value=6>6</option>
<option value=7>7</option>
<option value=8>8</option>
<option value=9>9</option>
<option value=10>10</option>
<option value=11>11</option>
<option value=12>12</option>
<option value=13>13</option>
<option value=14>14</option>
<option value=15>15</option>
<option value=16>16</option>
<option value=17>17</option>
<option value=18>18</option>
<option value=19>19</option>
<option value=20>20</option>
<option value=21>21</option>
<option value=22>22</option>
<option value=23>23</option>
<option value=24>24</option>
<option value=25>25</option>
</select>
Input:<br>
<textarea name="plaintext" style="width:500px;height:150px;"></textarea>
<input type="submit">
</form>
<hr>
Formlen for decrypt er: E(x) = (a^-1)(x - b) mod n <br>
Da jeg bruger 26 karakterer a-z er n = 26 (dvs fra 0=a - 25=z)<br>
<form action="?action=decrypt" method="post">
<textarea name="ciphertext" style="width:500px;height:150px;"></textarea>
<input type="submit">
</form>
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try {
var pageTracker = _gat._getTracker("UA-10543368-1");
pageTracker._trackPageview();
} catch(err) {}</script>