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PHP¿¡¼­ ¾Ïȣȭ encrypt º¹È£È­ decrypt Çؼ­ °ªÀ» ³Ñ±â±â
13³â Àü
php¿¡¼­ mcrypt_encrypt ÇÔ¼ö¸¦ ÀÌ¿ëÇÒ ¼ö ÀÖ´Ù¸é ¼Õ½±°Ô Àû¿ëÇÒ ¼ö ÀÖ°ÚÁö¸¸ ÇÔ¼ö¸¦ ÀÌ¿ëÇÒ ¼ö ¾ø´Ù¸é mcrypt °ü·Ã ¼Ò½º¸¦ ¼³Ä¡¸¦ ÇؾßÇϸç php.ini Àû¿ëµµ ÇؾßÇÏ´Â ¹ø°Å·¯¿òÀÌ ÀÖ´Ù.
±×·¡¼­ php ½ºÅ©¸³Æ®¸¦ ÀÌ¿ëÇØ ÇÔ¼ö¸¦ ÀÌ¿ëÇؼ­ ¹Ù·Î ÀÌ¿ë°¡´É Çϵµ·Ï ÇÕ´Ï´Ù.

¸ÕÀú ¾Ïȣȭ encrypt ÇÔ¼ö :

### PHP¾Ïȣȭ ÇÔ¼ö
function encrypt($data,$k) {
$encrypt_these_chars = "1234567890ABCDEFGHIJKLMNOPQRTSUVWXYZabcdefghijklmnopqrstuvwxyz.,/?!$@^*()_+-=:;~{}";
$t = $data;
$result2;
$ki;
$ti;
$keylength = strlen($k);
$textlength = strlen($t);
$modulo = strlen($encrypt_these_chars);
$dbg_key;
$dbg_inp;
$dbg_sum;
for ($result2 = "", $ki = $ti = 0; $ti < $textlength; $ti++, $ki++) {
  if ($ki >= $keylength) {
   $ki = 0;
  }
  $dbg_inp += "["+$ti+"]="+strpos($encrypt_these_chars, substr($t, $ti,1))+" ";  
  $dbg_key += "["+$ki+"]="+strpos($encrypt_these_chars, substr($k, $ki,1))+" ";  
  $dbg_sum += "["+$ti+"]="+strpos($encrypt_these_chars, substr($k, $ki,1))+ strpos($encrypt_these_chars, substr($t, $ti,1)) % $modulo +" ";
  $c = strpos($encrypt_these_chars, substr($t, $ti,1));
  $d;
  $e;
  if ($c >= 0) {
   $c = ($c + strpos($encrypt_these_chars, substr($k, $ki,1))) % $modulo;
   $d = substr($encrypt_these_chars, $c,1);
   $e .= $d;
  } else {
   $e += $t.substr($ti,1);
  }
}
$key2 = $result2;
$debug = "Key  : "+$k+"\n"+"Input: "+$t+"\n"+"Key  : "+$dbg_key+"\n"+"Input: "+$dbg_inp+"\n"+"Enc  : "+$dbg_sum;
return $e . "";
}

¾Ïȣȭ »ç¿ë ¿¹:
$data = "iloveyou!good"; //¾Ïȣȭ Çؼ­ ³Ñ±æ °ª
$key = "123456"; //¾Ïȣȭ¿¡ ÀÌ¿ëµÉ Å° °ª
$edata = encrypt($data,$key); //key °ªÀ» ÀÌ¿ëÇØ data °ªÀ» ¾ÏȣȭÇؼ­ edata¿¡ ´ã¾Ò½À´Ï´Ù.
$getdata = urlencode($edata); //ÀÌ °ªÀ» post°¡ ¾Æ´Ñ getÀ¸·Î ³Ñ±ä´Ù¸é urlencode¸¦ ÇØÁÖ½Ã´Â°Ô ÁÁ°ÚÁÒ!
echo $getdata; //ÃÖÁ¾ ¾Ïȣȭ ¹× url ¿£ÄÚµå±îÁö ÇÑ °ª ÀÔ´Ï´Ù.

Ãâ·Â : imqyi%3Fov%40jstd

Ãâ·ÂµÈ °ª¸¸ ºÁ¼­´Â µµÀúÈ÷ ¾î¶² °ªÀÎÁö ¸ð¸£°ÚÁÒ?
ÀÌÁ¦ À§ °ªÀ¸·Î º¹È£È­ ÇØ º¸°Ú½À´Ï´Ù.

º¹È£È­ decrypt ÇÔ¼ö :

function decrypt($key2,$secret) {
$encrypt_these_chars = "1234567890ABCDEFGHIJKLMNOPQRTSUVWXYZabcdefghijklmnopqrstuvwxyz.,/?!$@^*()_+-=:;~{}";
$input = $key2;
$output = "";
$debug = "";
$k = $secret;
$t = $input;
$result;
$ki;
$ti;
$keylength = strlen($k);
$textlength = strlen($t);
$modulo = strlen($encrypt_these_chars);
$dbg_key;
$dbg_inp;
$dbg_sum;
for ($result = "", $ki = $ti = 0; $ti < $textlength; $ti++, $ki++) {
  if ($ki >= $keylength){
   $ki = 0;
  }
  $c = strpos($encrypt_these_chars, substr($t, $ti,1));
  if ($c >= 0) {
   $c = ($c - strpos($encrypt_these_chars , substr($k, $ki,1)) + $modulo) % $modulo;
   $result .= substr($encrypt_these_chars , $c, 1);
  } else {
   $result += substr($t, $ti,1);
  }
}
return $result;
}
º¹È£È­ »ç¿ë ¿¹ :
$data = urldecode($getdata); //urlencode·Î ¹ÞÀº °ªÀ» ¸ÕÀú urldecode ó¸®ÇؾßÇÔ
$key = "123456"; //¾Ïȣȭ ÇÒ ¶§ ÀÌ¿ëÇÑ Å°°ª°ú µ¿ÀÏÇÏ°Ô »ç¿ë
$ddata = decrypt($data,$key); //º¹È£È­ ó¸®
echo $ddata; //ÃÖÁ¾ º¹È£È­ °ª Àü´ÞÇÏ°íÀÚ ÇÏ´Â °ªÀÌ Á¦´ë·Î Àü´Þ µÇ¾ú±º¿ä!

Ãâ·Â°á°ú : iloveyou!good

À§ ¾Ïȣȭ º¹È£È­ ¹æ½ÄÀÇ ´ÜÁ¡Àº
$encrypt_these_chars = "1234567890ABCDEFGHIJKLMNOPQRTSUVWXYZabcdefghijklmnopqrstuvwxyz.,/?!$@^*()_+-=:;~{}";
¿¡ ÁöÁ¤µÈ °ª¸¸ ¾Ïȣȭ µÈ´Ù´Â °Í ÀÔ´Ï´Ù.
Áï, ¾Ïȣȭ ºñ±³¸¦ ÇÒ °ªÀÌ ¾ø´Â°Ç¿¡ ´ëÇؼ­´Â Ãß°¡ ÇØ¾ß ÇÕ´Ï´Ù.
Âü°í·Î, ÇѱÛÀº ¾ÈµË´Ï´Ù. ^^
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