Question

我用PHP创建了验证码图像制作程序

<?php
function word($n) {
    $consonants = "bcdfghjklmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ";
    $vowels = "aeiou";
    $word[1] =  $consonants[rand(0, 41)];
    $word[2] .= $vowels[rand(0, 4)];
    $word[3] .= $consonants[rand(0, 41)];
    $word[4] .= $consonants[rand(0, 41)];
    return $word[$n];
}

    $xs = 550;
    $ys = 300;
    $im = imagecreatetruecolor($xs, $ys);
    $newim = imagecreatetruecolor($xs, $ys);
    imagettftext($im, $ys/5, rand(-10, 10), rand(0, 10), $ys/2, 0xFFFFFF, "geosans.ttf", word(1));
    imagettftext($im, $ys/4.5, rand(-10, 10), rand(50, 70), $ys/2, 0xFFFFFF, "geosans.ttf", word(2));
    imagettftext($im, $ys/4, rand(-10, 10), rand(100, 150), $ys/2, 0xFFFFFF, "geosans.ttf", word(3));
    imagettftext($im, $ys/3.5, rand(-10, 10), rand(185, 210), $ys/2, 0xFFFFFF, "geosans.ttf", word(4));
    for ($x=0; $x<=$xs;$x++){
        for ($y=0; $y<=$ys;$y++){
            $rgba = imagecolorsforindex($im, imagecolorat($im, $x, $y));
            $col = imagecolorallocate($newim, $rgba["red"], $rgba["green"], $rgba["blue"]);

            $distorted_y = ($y + round(45*sin($x/50)) + imagesy($im)) % imagesy($im);
            imagesetpixel($newim, $x, $distorted_y, $col);
        }
    }

    imagefilter($newim, IMG_FILTER_NEGATE);


    header("Content-type: image/png");
    imagepng($newim);
?>

但我该如何应用呢？

官方验证码网站加密如何

这是一个例子

http://www.google.com/recaptcha/api/image?c=03AHJ_VutAc1sMxyCE0N98Kh2AfMGlGmu7_DzzFP3Rn1gLHdbDulOQYK0w-sVrxqHWSTBCfVBipmqY-ywmme2_cuClW5QBRzKdzRSJeMWyme1aoGZ-y0OluiSfn-uKDExfVCo2PGrTao2wWpBLultbUEsctlJ97JXKCQ

总的来说，我问如何安全地加密我的数据？

Answer 1

Google拥有数百万用户，而且我确信每天都会被恶意机器人攻击数十万次。在某些情况下，像base64_encode这样的东西会起作用 - 在谷歌的情况下，他们可能会使用PGP（这对大多数应用来说都是过度杀戮）。在我看来，中间地带将是base64编码的MCRYPT（以保持查询字符串URL友好）。

http://us2.php.net/mcrypt

http://us2.php.net/base64_encode

Answer 2

您可以像在数据库中存储密码一样进行操作。用MD5和一些随机的SALT对它们进行哈希处理。

http://www.pixel2life.com/publish/tutorials/118/understanding_md5_password_encryption/

验证码加密

2 个答案: