<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><BR class="khtml-block-placeholder"><DIV><BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">On Wed, Nov 15, 2006 at 01:05:51PM +0100, Narcis wrote:</DIV> <BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">can anyone enlighten me? it looks like the address (ip?) and port of</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">the client (server?) are used in the decryption of the rsa key.</DIV> </BLOCKQUOTE><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Yes.<SPAN class="Apple-converted-space"> </SPAN>The first few bytes of the message are replaced with the unencoded</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">32-bit IPv4 address of the server, and the port number, both of which</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">were obtained using getpeername.</DIV></BLOCKQUOTE><DIV><BR class="khtml-block-placeholder"></DIV>okay so 66.11.161.166 would put 66 in byte 0, 11 in byte 1 etc </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>and the port 0x1234 would put 0x12 in byte 4 and 0x34 in byte 5?</DIV><DIV><BR><BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">This may be a misguided attempt to increase the difficulty of</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">man-in-the-middle attack on the scheme, written in the days when it</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">wasn't trivial to do network address translation.</DIV></BLOCKQUOTE><DIV><BR class="khtml-block-placeholder"></DIV><DIV>hmm i think it will be something like :</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;">hostName = [ONHost hostForHostname:@"netrek.pulsar-zone.net"];</SPAN></FONT></DIV><DIV><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;">ONHostAddress *address = [[hostName addresses] objectAtIndex:</SPAN></FONT><FONT class="Apple-style-span" color="#0000FF" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;">0</SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;">];</SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="3"><SPAN class="Apple-style-span" style="font-size: 11px;"></SPAN></FONT></DIV><DIV><FONT class="Apple-style-span" color="#760F50" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;">char</SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;"> *p = [[address addressData] bytes];</SPAN></FONT><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;"></SPAN></FONT></DIV><DIV><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;"><BR class="khtml-block-placeholder"></SPAN></FONT></DIV><DIV><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;">then copy the first 4 bytes. </SPAN></FONT></DIV><DIV><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;"><BR class="khtml-block-placeholder"></SPAN></FONT></DIV><DIV><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;">should work unless it get's more then one interface returned for </SPAN></FONT></DIV><DIV><FONT class="Apple-style-span" face="Monaco" size="2"><SPAN class="Apple-style-span" style="font-size: 10px;">the host. Which can only happen when you run the app on the server.</SPAN></FONT></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>regards</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Chris</DIV><BR></DIV><BR></BODY></HTML>