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64		<b><a href="/">×òî òàêîå CAPTCHA</a></b><br />
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67<b><a href="/breakings/">Ïðèìåðû âçëîìà</a></b><br />
68<b>Ïðîåêò KCAPTCHA</b><br />
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74		<p>
75<a href="/kcaptcha/">Ïðîãðàììíûé êîä CAPTCHA íà PHP</a>
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146
147
148
149	<H1>KCAPTCHA — ãîòîâîå ðåøåíèå</H1> 
150
151<P>Ïðîåêò KCAPTCHA — ýòî ãîòîâîå ðåøåíèå, íàïèñàííîå íà ÿçûêå PHP, êîòîðîå âû ìîæåòå <STRONG>áåñïëàòíî</STRONG> ñêà÷àòü è óñòàíîâèòü íà ñâîé ñàéò äëÿ çàùèòû îò ñïàìà è ôëóäà.</P> 
152
153<P>Ïðîåêò KCAPTCHA ñòàâèò ïåðåä ñîáîé öåëü ïðåäëîæèòü ïðîãðàììèñòó ðåøåíèå ñ îäíîé ñòîðîíû âåñüìà çàùèùåííîå, ñ äðóãîé&nbsp;— ìàêñèìàëüíî ìàëîòðåáîâàòåëüíîå ê ðåñóðñàì è êîíôèãóðàöèè õîñòèíãà.</P> 
154
155<P>Âîò ïðèìåð ðàáîòû (èçîáðàæåíèå ñîçäàåòñÿ "íà ëåòó", îáíîâèòå ñòðàíèöó äëÿ ãåíåðàöèè äðóãèõ âàðèàíòîâ):</P> 
156
157<P class=center><IMG src="/captcha2/"></P> 
158
159<P>Ïðèíöèï äåéñòâèÿ: ñêðèïò çàâîäèò ñåññèþ è çàïèñûâàåò â íåå ïîä èìåíåì <SPAN class=nobr>$_SESSION['captcha_keystring']</SPAN> ñëó÷àéíûì îáðàçîì ñãåíåðèðîâàííóþ ñòðîêó, ïîñëå ÷åãî âûäàåò èçîáðàæåíèå, ñîäåðæàùåå ýòó ñàìóþ ñòðîêó â çàøóìëåííîì âèäå. Ïðè ïðîâåðêå ïîëüçîâàòåëüñêîãî ââîäà âàì îñòàåòñÿ òîëüêî ïðî÷èòàòü èç ñåññèè êîäîâóþ ñòðîêó è ñðàâíèòü ñ òåì, ÷òî ââåë ïîëüçîâàòåëü (ïîäðîáíåå îá <A href="/articles/algorithm/">àñïåêòàõ áåçîïàñíîñòè ïðè ïðîâåðêå ïîëüçîâàòåëüñêîãî ââîäà</A>).</P> 
160
161<P>Ñèñòåìíûå òðåáîâàíèÿ: <STRONG>PHP âåðñèè 4.0.6</STRONG> è âûøå ñ ïîääåðæêîé <STRONG>GD</STRONG> âåðñèè 2. <EM>Íå òðåáóþòñÿ</EM> íè áèáëèîòåêè äëÿ ðàáîòû ñî øðèôòàìè (Libttf è äð.), íè ImageMagick.</P> 
162
163<P>Â êîìïëåêò âõîäèò íàáîð ðàñòðîâûõ øðèôòîâ, òàê ÷òî ñêðèïò, ñêîðåå âñåãî, áóäåò ñðàçó ãîòîâ ê ðàáîòå, íå òðåáóÿ óñòàíîâêè äîïîëíèòåëüíûõ êîìïîíåíò.</P> 
164
165<P>Ìîæíî íàñòðàèâàòü öâåòà è íàáîð ñèìâîëîâ, ïðèìåíÿåìûå ïðè ñîçäàíèè èçîáðàæåíèÿ.</P> 
166
167<P><STRONG>Ñêà÷àòü </STRONG><A href="/kcaptcha.zip/kcaptcha.zip"><STRONG>KCAPTCHA 2.0</STRONG></A></P> 
168<hr>
169<p><a href="../kcaptcha1/">Ñòàðàÿ âåðñèÿ (1.2.6)</a></p>
170
171<P><IMG src="/captcha/"></P> 
172
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