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跨屏技术的实现

概述

跨屏技术 简介

Criteo 跨屏技术能够让 Criteo 跨多台设备精确匹配用户。为了实现 Criteo 跨屏技术并从中受益,您需要将跨屏技术相关的参数添加到现有 Criteo OneTag 中。 

例如:当您的客户正在从他的移动设备浏览您网站上的产品,通过 Criteo 跨屏技术,该客户有可能稍后会从他的台式机设备上看到您的相关横幅广告。

 

 

为了实现跨屏技术,客户的 email 地址 (中国大陆用户为手机号) 将用作跨设备参数。为了确保可识别个人身份的信息 (PII) 不泄露,所有 email 地址(或手机号) 在存储到 Criteo 的服务器之前都将用 MD5 Hash 算法进行处理。然后,Criteo 根据得出的加密值在不同设备之间进行用户匹配。

隐私

保护用户隐私是 Criteo 客户主要关心的一个问题,因此 Criteo 不会且永远不会存储任何个人数据。为了确保您客户的隐私,Criteo 仅将您的客户的经过加密的 email 地址 (或手机号) 存储在服务器上,此加密过程无法反转,从而保证了所有客户信息始终保持匿名。

Criteo 不收集或是处理任何直接的可识别个人身份的信息 (PII)。相反,Crit​​eo 使用“假名”信息在不同设备间匹配用户。

为了提供最大的保护,Criteo 使用 MD5 Hash 算法来加密用户的 email 地址 (或手机号)。MD5 加密 email (或手机号) 得到的独特且永久的标识符能够让 Criteo 跨不同的设备并且跨不同的客户网站识别用户(见上),但是它们均不能用来识别您的用户的身份。Criteo 绝不会存储任何未经加密处理的 email 地址 (或手机号)。
Criteo 通过隐私政策和用户可自由选择退出的解决方案向用户提供完全透明的服务。除此之外,我们也要求我们的合作伙伴在其隐私政策中透明地公开我们的服务和方法。这意味着用户在浏览时可以随时访问我们的服务相关信息,并且随时选择退出。

实现 Criteo 跨屏技术的方法

为了向客户提供最大的灵活性,Criteo 接受加密或纯文本形式的用户 email 地址 (或手机号)。

若传递纯文本电子邮件或 MD5 加密的电子邮件,请使用 setEmail 事件。

在进行加密处理或传递纯文本之前,所有用户的 email 地址 (或手机号) 都需要:

  • 修整(删除用户 email 地址或手机号前后的所有空格)。
  • 转换(将 email 地址转换为小写,中国大陆地区为纯数字11位手机号)。
  • 编码 (用 UTF-8 编码 email)。

跨设备参数 

我们建议您发送已通过 Hash 算法(使用 MD5 算法)加密的电子邮件或手机号。此处是 setEmail 事件中所发送 MD5 加密电子邮件或者手机号的示例:

{ event: "setEmail", email: "b58996c504c5638798eb6b511e6f49af" },

如果已发送未加密的电子邮件地址,Criteo 将在用户电子邮件保存至我们的数据库前对其进行自动加密。此处是 setEmail 事件中所发送纯文本电子邮件的示例:

{ event: "setEmail", email: "user@example.com" },

或者中国大陆用户:
{ event: "setEmail", email: "13800000000" },

如果您无法传递任何 email 地址或者手机号,请传递空的字符串:

{ event: "setEmail", email: "" },

Hash 算法

如果您直接传递经过加密的 email 地址,根据使用的不同语言, 您可以参考以下算法代码确保加密正确:

使用 PHP 的 Hash 算法代码

$source_address = "uSèr@example.Com ";
$processed_address = strtolower($source_address); //convert address to lower case
$processed_address = trim($processed_address); //trimming leading and trailing spaces
$processed_address = mb_convert_encoding($processed_address, "UTF-8", "ISO-8859-1"); //conversion from ISO-8859-1 to UTF-8 (replace "ISO-8859-1" with the source encoding of your string)
$processed_address = md5($processed_address); //hash address with MD5 algorithm
echo "Source e-mail: ".$source_address." | Hashed e-mail: ".$processed_address;

使用 C# 的 Hash 算法代码

using System; 
 using System.Collections.Generic; using System.Linq;
 using System.Text;
 using System.Security.Cryptography;
 namespace Sample_EmailHashing_code
 {
     public class CriteoHashedEmailFormatter
     {
         private static MD5 _md5;
         private static MD5 Md5
         {
             get { return _md5 ?? (_md5 = MD5.Create()); }
         }
         private static string Md5Encode(string sourceString)
         {
             byte[] inputBytes = Encoding.UTF8.GetBytes(sourceString);
             byte[] hash = Md5.ComputeHash(inputBytes);
             var sb = new StringBuilder(32);
             foreach (byte b in hash)
                 sb.Append(b.ToString("x2"));
             return sb.ToString();
         }
         public static string HashEmail(string sourceEmail)
         {
             String processedEmail;
             processedEmail = sourceEmail.ToLowerInvariant(); //conversion to lower case
             processedEmail = processedEmail.Trim(); //trimming leading and trailing spaces
             //conversion to UTF-8 and hashing with MD5
             processedEmail = Md5Encode(processedEmail);
             return processedEmail;
         }
     }
     class SampleEmailHashing
     {
         static void Main(string[] args)
         {
             String sourceEmail = "   uSèr@example.Com   ";
             String processedEmail =
CriteoHashedEmailFormatter.HashEmail(sourceEmail);
             Console.WriteLine(processedEmail);
             Console.ReadKey();
         }
     }
 }

 

使用 PHP 的 Hash 算法代码

点击此处以展开

 import java.io.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class SampleEmailHashing {
     public static void main(String[] args) {          
     String sourceEmail = new String(" uSèr@example.Com ");
        String processedEmail = FormatMail(sourceEmail);
        System.out.println(processedEmail);
     }
     //Method to format the source Email, converting to lower case and removing spaces     private static String FormatMail(String mail) {
         String newMail = new String(mail);
         // conversion to lower case characters
         newMail = newMail.toLowerCase();
         //remove empty spaces
         newMail = newMail.trim();
         newMail = md5Java(newMail);      
            
return newMail;
     }
     
//Method to encrypt email address using MD5
     public static String md5Java(String message) {         String digest = null;         try {
             //conversion to UTF-8 and hashing with MD5             MessageDigest md = MessageDigest.getInstance("MD5");
             byte[] hash = md.digest(message.getBytes("UTF-8"));
             StringBuilder sb = new StringBuilder(2 * hash.length);
             for (byte b : hash) {
                 sb.append(String.format("%02x", b & 0xff));
             }
             digest = sb.toString();
         } catch (UnsupportedEncodingException ex) {
             ex.printStackTrace();
         } catch (NoSuchAlgorithmException ex) {
             ex.printStackTrace();
         }         return digest;
     }
}

使用 Perl 的 Hash 算法代码  

#!/usr/bin/perl
use strict;
use warnings;
use Digest::MD5 qw(md5 md5_hex);
use Encode;
my $original_email  = qw/ uSèr@example.Com /;
my $processed_email = lc($original_email);
    $processed_email =~ s/^\s+//;
    $processed_email =~ s/\s+$//;
    $processed_email = encode_utf8($processed_email);
    $processed_email = md5_hex($processed_email);
print "Original email:\t$original_email\n";
print "Hashed email:\t$processed_email \n";

使用 JavaScript 的 Hash 算法

function utf8_encode(argString) {

  if (argString === null || typeof argString === 'undefined') {
    return '';
  }

  var string = (argString + ''); // .replace(/\r\n/g, "\n").replace(/\r/g, "\n");
  var utftext = '',
    start, end, stringl = 0;

  start = end = 0;
  stringl = string.length;
  for (var n = 0; n < stringl; n++) {
    var c1 = string.charCodeAt(n);
    var enc = null;

    if (c1 < 128) {
      end++;
    } else if (c1 > 127 && c1 < 2048) {
      enc = String.fromCharCode(
        (c1 >> 6) | 192, (c1 & 63) | 128
      );
    } else if ((c1 & 0xF800) != 0xD800) {
      enc = String.fromCharCode(
        (c1 >> 12) | 224, ((c1 >> 6) & 63) | 128, (c1 & 63) | 128
      );
    } else { // surrogate pairs
      if ((c1 & 0xFC00) != 0xD800) {
        throw new RangeError('Unmatched trail surrogate at ' + n);
      }
      var c2 = string.charCodeAt(++n);
      if ((c2 & 0xFC00) != 0xDC00) {
        throw new RangeError('Unmatched lead surrogate at ' + (n - 1));
      }
      c1 = ((c1 & 0x3FF) << 10) + (c2 & 0x3FF) + 0x10000;
      enc = String.fromCharCode(
        (c1 >> 18) | 240, ((c1 >> 12) & 63) | 128, ((c1 >> 6) & 63) | 128, (c1 & 63) | 128
      );
    }
    if (enc !== null) {
      if (end > start) {
        utftext += string.slice(start, end);
      }
      utftext += enc;
      start = end = n + 1;
    }
  }

  if (end > start) {
    utftext += string.slice(start, stringl);
  }

  return utftext;
}


function md5(str) {

  var str = str.toLowerCase();
  var xl;

  var rotateLeft = function(lValue, iShiftBits) {
    return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
  };

  var addUnsigned = function(lX, lY) {
    var lX4, lY4, lX8, lY8, lResult;
    lX8 = (lX & 0x80000000);
    lY8 = (lY & 0x80000000);
    lX4 = (lX & 0x40000000);
    lY4 = (lY & 0x40000000);
    lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);
    if (lX4 & lY4) {
      return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
    }
    if (lX4 | lY4) {
      if (lResult & 0x40000000) {
        return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
      } else {
        return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
      }
    } else {
      return (lResult ^ lX8 ^ lY8);
    }
  };

  var _F = function(x, y, z) {
    return (x & y) | ((~x) & z);
  };
  var _G = function(x, y, z) {
    return (x & z) | (y & (~z));
  };
  var _H = function(x, y, z) {
    return (x ^ y ^ z);
  };
  var _I = function(x, y, z) {
    return (y ^ (x | (~z)));
  };

  var _FF = function(a, b, c, d, x, s, ac) {
    a = addUnsigned(a, addUnsigned(addUnsigned(_F(b, c, d), x), ac));
    return addUnsigned(rotateLeft(a, s), b);
  };

  var _GG = function(a, b, c, d, x, s, ac) {
    a = addUnsigned(a, addUnsigned(addUnsigned(_G(b, c, d), x), ac));
    return addUnsigned(rotateLeft(a, s), b);
  };

  var _HH = function(a, b, c, d, x, s, ac) {
    a = addUnsigned(a, addUnsigned(addUnsigned(_H(b, c, d), x), ac));
    return addUnsigned(rotateLeft(a, s), b);
  };

  var _II = function(a, b, c, d, x, s, ac) {
    a = addUnsigned(a, addUnsigned(addUnsigned(_I(b, c, d), x), ac));
    return addUnsigned(rotateLeft(a, s), b);
  };

  var convertToWordArray = function(str) {
    var lWordCount;
    var lMessageLength = str.length;
    var lNumberOfWords_temp1 = lMessageLength + 8;
    var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;
    var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;
    var lWordArray = new Array(lNumberOfWords - 1);
    var lBytePosition = 0;
    var lByteCount = 0;
    while (lByteCount < lMessageLength) {
      lWordCount = (lByteCount - (lByteCount % 4)) / 4;
      lBytePosition = (lByteCount % 4) * 8;
      lWordArray[lWordCount] = (lWordArray[lWordCount] | (str.charCodeAt(lByteCount) << lBytePosition));
      lByteCount++;
    }
    lWordCount = (lByteCount - (lByteCount % 4)) / 4;
    lBytePosition = (lByteCount % 4) * 8;
    lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);
    lWordArray[lNumberOfWords - 2] = lMessageLength << 3;
    lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;
    return lWordArray;
  };

  var wordToHex = function(lValue) {
    var wordToHexValue = '',
      wordToHexValue_temp = '',
      lByte, lCount;
    for (lCount = 0; lCount <= 3; lCount++) {
      lByte = (lValue >>> (lCount * 8)) & 255;
      wordToHexValue_temp = '0' + lByte.toString(16);
      wordToHexValue = wordToHexValue + wordToHexValue_temp.substr(wordToHexValue_temp.length - 2, 2);
    }
    return wordToHexValue;
  };

  var x = [],
    k, AA, BB, CC, DD, a, b, c, d, S11 = 7,
    S12 = 12,
    S13 = 17,
    S14 = 22,
    S21 = 5,
    S22 = 9,
    S23 = 14,
    S24 = 20,
    S31 = 4,
    S32 = 11,
    S33 = 16,
    S34 = 23,
    S41 = 6,
    S42 = 10,
    S43 = 15,
    S44 = 21;

  str = utf8_encode(str);
  x = convertToWordArray(str);
  a = 0x67452301;
  b = 0xEFCDAB89;
  c = 0x98BADCFE;
  d = 0x10325476;

  xl = x.length;
  for (k = 0; k < xl; k += 16) {
    AA = a;
    BB = b;
    CC = c;
    DD = d;
    a = _FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);
    d = _FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);
    c = _FF(c, d, a, b, x[k + 2], S13, 0x242070DB);
    b = _FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);
    a = _FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);
    d = _FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);
    c = _FF(c, d, a, b, x[k + 6], S13, 0xA8304613);
    b = _FF(b, c, d, a, x[k + 7], S14, 0xFD469501);
    a = _FF(a, b, c, d, x[k + 8], S11, 0x698098D8);
    d = _FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);
    c = _FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);
    b = _FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);
    a = _FF(a, b, c, d, x[k + 12], S11, 0x6B901122);
    d = _FF(d, a, b, c, x[k + 13], S12, 0xFD987193);
    c = _FF(c, d, a, b, x[k + 14], S13, 0xA679438E);
    b = _FF(b, c, d, a, x[k + 15], S14, 0x49B40821);
    a = _GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);
    d = _GG(d, a, b, c, x[k + 6], S22, 0xC040B340);
    c = _GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);
    b = _GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);
    a = _GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);
    d = _GG(d, a, b, c, x[k + 10], S22, 0x2441453);
    c = _GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);
    b = _GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);
    a = _GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);
    d = _GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);
    c = _GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);
    b = _GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);
    a = _GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);
    d = _GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);
    c = _GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);
    b = _GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);
    a = _HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);
    d = _HH(d, a, b, c, x[k + 8], S32, 0x8771F681);
    c = _HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);
    b = _HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);
    a = _HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);
    d = _HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);
    c = _HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);
    b = _HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);
    a = _HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);
    d = _HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);
    c = _HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);
    b = _HH(b, c, d, a, x[k + 6], S34, 0x4881D05);
    a = _HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);
    d = _HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);
    c = _HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);
    b = _HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);
    a = _II(a, b, c, d, x[k + 0], S41, 0xF4292244);
    d = _II(d, a, b, c, x[k + 7], S42, 0x432AFF97);
    c = _II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);
    b = _II(b, c, d, a, x[k + 5], S44, 0xFC93A039);
    a = _II(a, b, c, d, x[k + 12], S41, 0x655B59C3);
    d = _II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);
    c = _II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);
    b = _II(b, c, d, a, x[k + 1], S44, 0x85845DD1);
    a = _II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);
    d = _II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);
    c = _II(c, d, a, b, x[k + 6], S43, 0xA3014314);
    b = _II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);
    a = _II(a, b, c, d, x[k + 4], S41, 0xF7537E82);
    d = _II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);
    c = _II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);
    b = _II(b, c, d, a, x[k + 9], S44, 0xEB86D391);
    a = addUnsigned(a, AA);
    b = addUnsigned(b, BB);
    c = addUnsigned(c, CC);
    d = addUnsigned(d, DD);
  }

  var temp = wordToHex(a) + wordToHex(b) + wordToHex(c) + wordToHex(d);

  return temp.toLowerCase();
}
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