通过一张图片能够获得多少信息？

博主：奈落
发布时间：2022 年 06 月 16 日
3407 次浏览
1 条评论
13854字数
分类：技术

# 1. 前言

通过一张照片能够获得多少信息？可以通过本篇文章的一个例子来学习，同时也能提高保护的个人隐私的意识。

免责声明：本文旨在记录生活经历，且文章内出现的相关人物信息已经过处理。如因模仿本文章内容⽽触犯中华⼈民共和国法律，使⽤者应⾃⾏承担全部责任。
</div>

---

# 2. 原始信息

**通过这张图片我们可以得到这些信息：**

* 此人是2018级上海美术学院设计学专业的研究生
* 照片发布者为了保护隐私用马赛克挡住了名字、学号和照片
* 注意，图片上有一个非常关键的地方——条形码，而且这个条形码是在学号的上方，它大概率表示的也是学号。虽然它也被马赛克遮挡住了，但是大部分的条形码都具备有纠错功能，我们此时就可以从这里入手

---

# 3. 条形码分析

通过对格式分析得出此条形码采用Code128格式。

### 3.1. code128详解

<a href="#excursus">**code128的字符设置参见文章底部的附录**</a>

code128码符号包括一个静止区、一个开始字符、编码数据、一个检测字符、停止字符和一个尾部的静止区。**而这里的检测字符就是关键**，它可以帮助还原出条形码的数据。

#### 开始字符

code128通过三个不同的开始字符来进行标识，START CodeA允许所有的键盘字符+控制字符和特殊字符进行编码，START CodeB包括所有标准字母数字键盘字符+小写字母和特殊字符，START CodeC包括一个100位数字（00-99），用于编码数字数据的密度压缩。

#### 编码数据

Code 128条码指定相互间隔的3个条形和3个空白（共六个单元）代表一个字符，每个字符由一个条开始，以一个空结束。 在条形码字体中，最后一个条形通常与终止符一起组合成一个更宽的终止符。
附录部分详细说明了每个字符条码的宽度与间隙的关系，每个条的宽度可以为1,2,3,4个单位。 例如字母“A”可以被表示为图案10100011000，或者表示为宽度111323。

#### 检测字符

code128的每个字符都有一个值，范围从0到105，这个值被用来计算条形码的校验字符。校验字符通过MOD103算法，下面举例说明：
例子：BarCode 1
信息：StartB B a r C o d e 1
值：104 34 65 82 35 79 68 69 0 17
位置：- 1 2 3 4 5 6 7 8 9
计算：104 + (34×1) + (65×2) + (82×3) + (35×4) + (79×5) + (68×6) + (69×7) + (0×8) + (17×9) = 2093
2093 / 103 = 20......33
33 = A
<div class="tip inlineBlock info">

注意：当你打印校验字符“A”时，你需打印ASCII字符数65（而不是33），你必须增加32到校验数上，然后找出打印的ASCII字符。比如说，你使用START A打印codeA条码,计算出的校验数字是64，你可能会认为打印一个NULL字符，那你就错了，你必须增加32得到一个96，你能够打印出ASCII字符96( `字符)。
</div>

### 3.2. 案例条形码分析

看过上述内容想必你对Code128条形码有了一定的了解，现在进入实战部分，一边对照Code128条形码字符表一边按照条形码的分区解码。

#### 开始字符

开头的6个条纹宽度为211232，可以得出条形码开始字符为start code C。

#### 编码数据区

分别由条纹宽度223211，122411，算出18和72，这两个数字和下面的学号相吻合，也就证明之前得出的结论是正确的。但是后面的数字模糊不清，只能看出部分，其中被挡住部分的条纹宽度的可能是2、3或者4，其余的部分完全看不清，这里把所有可能性罗列一遍。

左边的「 ？」可能是
213212(21)，212123(30)，212321(31)，213113(51)，213311(52)，213131(53)，212141(89)，214121(90)
右边的「 ？」可能是
232121(32)，133121(47)，313121(48)，214121(90)，412121(91)

#### 纠错码

除去最后7位停止字符，往前6个条纹宽度为411131，可以得出纠错码为102。

根据纠错码写几行代码简单验证一下被遮住的条形码的数据。

```
#include <stdio.h>
int main()
{
	int a[] = {21, 30, 31, 51, 52, 53, 89, 90}, b[] = {32, 47, 48, 90, 91};
	int i, j;
	for (i = 0; i < 8; i++)
		{
		for (j = 0; j < 5; j++)
		{
			if ((3 * a[i] + 4 * b[j] + 267) % 103 == 102)
			printf("学号是：1872%d%d", a[i], b[j]);
		}
	}
	return 0;
}
```

运行代码我们得到此人的学号是18723190

---

# 4. 利用Google进行社工

### 4.1. 常见Google搜索语法

#### 搜索逻辑

* 逻辑与：and
* 逻辑或：or
* 逻辑非：-
* 完整匹配："关键词"
* 通配符：* ?

#### 文件类型

`filetype:文件类型`

例如我想找一篇论文的格式模板
`论文格式 filetype:doc`

#### 指定站点

`site:指定站点`

例如我想在微博内寻找匹配美国这个关键词的页面
`"美国" site:weibo.com`

### 4.2. 实战

根据我们所得到的学号信息，把18723190作为关键字，文件类型指定为pdf查找人员的名单，我们最终得出这张证书所对应人的姓名。

`"18723190" filetype:pdf`

![搜索结果如图所示](http://cloud.nailoy.com/typecho/uploads/2022/07/4213944434.png)

<div class="panel panel-default collapse-panel box-shadow-wrap-lg"><div class="panel-heading panel-collapse" data-toggle="collapse" data-target="#collapse-d1657ced5bc728c8856217ba3d256df389" aria-expanded="true"><div class="accordion-toggle"><span style="id:excursus;">附录：Code128条形码字符表（点击以展开）</span>
<i class="pull-right fontello icon-fw fontello-angle-right"></i>
</div>
</div>
<div class="panel-body collapse-panel-body">
<div id="collapse-d1657ced5bc728c8856217ba3d256df389" class="collapse collapse-content"><p></p>

<table width="800" border="1" style="border-collapse:collapse">
  <tr>
    <th rowspan="2" scope="col">值</th>
    <th rowspan="2" scope="col">Code A</th>
    <th rowspan="2" scope="col">Code B</th>
    <th rowspan="2" scope="col">Code C</th>
    <th colspan="6" scope="col">图案</th>
    <th rowspan="2" scope="col">想要打印的ASCII字符</th>
  </tr>
  <tr>
    <td>条</td>
    <td>空</td>
    <td>条</td>
    <td>空</td>
    <td>条</td>
    <td>空</td>
    </tr>
  <tr>
    <td>0</td>
    <td>SP</td>
    <td>SP</td>
    <td>00</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>SP(ASCII 32)</td>
  </tr>
  <tr>
    <td>1</td>
    <td>!</td>
    <td>!</td>
    <td>01</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>!(ASCII 33)</td>
  </tr>
  <tr>
    <td>2</td>
    <td>"</td>
    <td>"</td>
    <td>02</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>"(ASCII 34)</td>
  </tr>
  <tr>
    <td>3</td>
    <td>#</td>
    <td>#</td>
    <td>03</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>3</td>
    <td>#(ASCII 35)</td>
  </tr>
  <tr>
    <td>4</td>
    <td>$</td>
    <td>$</td>
    <td>04</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>2</td>
    <td>$ (ASCII 36) </td>
  </tr>
  <tr>
    <td>5</td>
    <td>%</td>
    <td>%</td>
    <td>05</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>% (ASCII 37)</td>
  </tr>
  <tr>
    <td>6</td>
    <td>&</td>
    <td>&</td>
    <td>06</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>& (ASCII 38)</td>
  </tr>
  <tr>
    <td>7</td>
     <td>'</td>
    <td>'</td>
    <td>07</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>' (ASCII 39)</td>
  </tr>
  <tr>
    <td>8</td>
    <td>(</td>
    <td>(</td>
    <td>08</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>( (ASCII 40)</td>
  </tr>
  <tr>
    <td>9</td>
    <td>)</td>
    <td>)</td>
    <td>09</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>) (ASCII 41)</td>
  </tr>
  <tr>
    <td>10</td>
    <td>*</td>
    <td>*</td>
    <td>10</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>* (ASCII 42)</td>
  </tr>
  <tr>
    <td>11</td>
    <td>+</td>
    <td>+</td>
    <td>11</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>+ (ASCII 43)</td>
  </tr>
  <tr>
    <td>12</td>
    <td>,</td>
    <td>,</td>
    <td>12</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>3</td>
    <td>2</td>
    <td>, (ASCII 44)</td>
  </tr>
  <tr>
    <td>13</td>
    <td>-</td>
    <td>-</td>
    <td>13</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>- (ASCII 45)</td>
  </tr>
  <tr>
    <td>14</td>
    <td>.</td>
    <td>.</td>
    <td>14</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>. (ASCII 46)</td>
  </tr>
  <tr>
    <td>15</td>
    <td>/</td>
    <td>/</td>
    <td>15</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>/ (ASCII 47)</td>
  </tr>
  <tr>
    <td>16</td>
    <td>0</td>
    <td>0</td>
    <td>16</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>0 (ASCII 48)</td>
  </tr>
  <tr>
    <td>17</td>
    <td>1</td>
    <td>1</td>
    <td>17</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>1(ASCII 49)</td>
  </tr>
  <tr>
    <td>18</td>
    <td>2</td>
    <td>2</td>
    <td>18</td>
    <td>2</td>
    <td>2</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>2 (ASCII 50)</td>
  </tr>
  <tr>
    <td>19</td>
    <td>3</td>
    <td>3</td>
    <td>19</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>3 (ASCII 51)</td>
  </tr>
  <tr>
    <td>20</td>
    <td>4</td>
    <td>4</td>
    <td>20</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>4 (ASCII 52)</td>
  </tr>
  <tr>
    <td>21</td>
    <td>5</td>
    <td>5</td>
    <td>21</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>5 (ASCII 53)</td>
  </tr>
  <tr>
    <td>22</td>
    <td>6</td>
    <td>6</td>
    <td>22</td>
    <td>2</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>6 (ASCII 54)</td>
  </tr>
  <tr>
    <td>23</td>
    <td>7</td>
    <td>7</td>
    <td>23</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>7 (ASCII 55)</td>
  </tr>
  <tr>
    <td>24</td>
    <td>8</td>
    <td>8</td>
    <td>24</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>8 (ASCII 56)</td>
  </tr>
  <tr>
    <td>25</td>
    <td>9</td>
    <td>9</td>
    <td>25</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>9 (ASCII 57)</td>
  </tr>
  <tr>
    <td>26</td>
    <td>:</td>
    <td>:</td>
    <td>26</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>: (ASCII 57)</td>
  </tr>
  <tr>
    <td>27</td>
    <td>;</td>
    <td>;</td>
    <td>27</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>; (ASCII 59)</td>
  </tr>
  <tr>
    <td>28</td>
    <td><</td>
    <td><</td>
    <td>28</td>
    <td>3</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>< (ASCII 60)</td>
  </tr>
  <tr>
    <td>29</td>
    <td>=</td>
    <td>=</td>
    <td>29</td>
    <td>3</td>
    <td>2</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>= (ASCII 61)</td>
  </tr>
  <tr>
    <td>30</td>
    <td>></td>
    <td>></td>
    <td>30</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>> (ASCII 62)</td>
  </tr>
  <tr>
    <td>31</td>
    <td>?</td>
    <td>?</td>
    <td>31</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>? (ASCII 63)</td>
  </tr>
    <tr>
    <td>32</td>
    <td>@</td>
    <td>@</td>
    <td>32</td>
    <td>2</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>@ (ASCII 64)</td>
  </tr>
    <tr>
    <td>33</td>
    <td>A</td>
    <td>A</td>
    <td>33</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>3</td>
    <td>A (ASCII 65)</td>
  </tr>
    <tr>
    <td>34</td>
    <td>B</td>
    <td>B</td>
    <td>34</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>B (ASCII 66)</td>
  </tr>
    <tr>
    <td>35</td>
    <td>C</td>
    <td>C</td>
    <td>35</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>C (ASCII 67)</td>
  </tr>
    <tr>
    <td>36</td>
    <td>D</td>
    <td>D</td>
    <td>36</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>3</td>
    <td>D (ASCII 68)</td>
  </tr>
    <tr>
    <td>37</td>
    <td>E</td>
    <td>E</td>
    <td>37</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>E (ASCII 69)</td>
  </tr>
    <tr>
    <td>38</td>
    <td>F</td>
    <td>F</td>
    <td>38</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>F (ASCII 70)</td>
  </tr>
    <tr>
    <td>39</td>
    <td>G</td>
    <td>G</td>
    <td>39</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>3</td>
    <td>G (ASCII 71)</td>
  </tr>
    <tr>
    <td>40</td>
    <td>H</td>
    <td>H</td>
    <td>40</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>H (ASCII 72)</td>
  </tr>
    <tr>
    <td>41</td>
    <td>I</td>
    <td>I</td>
    <td>41</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>I (ASCII 73)</td>
  </tr>
    <tr>
    <td>42</td>
    <td>J</td>
    <td>J</td>
    <td>42</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>3</td>
    <td>J (ASCII 74)</td>
  </tr>
    <tr>
    <td>43</td>
    <td>K</td>
    <td>K</td>
    <td>43</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>3</td>
    <td>1</td>
    <td>K (ASCII 75)</td>
  </tr>
    <tr>
    <td>44</td>
    <td>L</td>
    <td>L</td>
    <td>44</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>L (ASCII 76)</td>
  </tr>
    <tr>
    <td>45</td>
    <td>M</td>
    <td>M</td>
    <td>45</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>M (ASCII 77) </td>
  </tr>
    <tr>
    <td>46</td>
    <td>N</td>
    <td>N</td>
    <td>46</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>N (ASCII 78)</td>
  </tr>
    <tr>
    <td>47</td>
    <td>O</td>
    <td>O</td>
    <td>47</td>
    <td>1</td>
    <td>3</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>O (ASCII 79)</td>
  </tr>
  <tr>
    <td>48</td>
    <td>P</td>
    <td>P</td>
    <td>48</td>
    <td>3</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>P (ASCII 80)</td>
  </tr>
  <tr>
    <td>49</td>
    <td>Q</td>
    <td>Q</td>
    <td>49</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>3</td>
    <td>1</td>
    <td>Q (ASCII 81)</td>
  </tr>
  <tr>
    <td>50</td>
    <td>R</td>
    <td>R</td>
    <td>50</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>R (ASCII 82) </td>
  </tr>
    <tr>
    <td>51</td>
    <td>S</td>
    <td>S</td>
    <td>51</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>S (ASCII 83)</td>
  </tr>
    <tr>
    <td>52</td>
    <td>T</td>
    <td>T</td>
    <td>52</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>T (ASCII 84)</td>
  </tr>
    <tr>
    <td>53</td>
    <td>U</td>
    <td>U</td>
    <td>53</td>
    <td>2</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>U (ASCII 85)</td>
  </tr>
    <tr>
    <td>54</td>
    <td>V</td>
    <td>V</td>
    <td>54</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>V (ASCII 86)</td>
  </tr>
    <tr>
    <td>55</td>
    <td>W</td>
    <td>W</td>
    <td>55</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>W (ASCII 87)</td>
  </tr>
    <tr>
    <td>56</td>
    <td>X</td>
    <td>X</td>
    <td>56</td>
    <td>3</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>X (ASCII 88) </td>
  </tr>
    <tr>
    <td>57</td>
    <td>Y</td>
    <td>Y</td>
    <td>57</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>Y (ASCII 89)</td>
  </tr>
    <tr>
    <td>58</td>
    <td>Z</td>
    <td>Z</td>
    <td>58</td>
    <td>3</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>Z (ASCII 90)</td>
  </tr>
    <tr>
    <td>59</td>
    <td>[</td>
    <td>[</td>
    <td>59</td>
    <td>3</td>
    <td>3</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>[ (ASCII 91) </td>
  </tr>
    <tr>
    <td>60</td>
    <td>\</td>
    <td>\</td>
    <td>60</td>
    <td>3</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>\ (ASCII 92)</td>
  </tr>
    <tr>
    <td>61</td>
    <td>]</td>
    <td>]</td>
    <td>61</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>] (ASCII 93)</td>
  </tr>
    <tr>
    <td>62</td>
    <td>^</td>
    <td>^</td>
    <td>62</td>
    <td>4</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>^ (ASCII 94) </td>
  </tr>
    <tr>
    <td>63</td>
    <td>_</td>
    <td>_</td>
    <td>63</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>4</td>
    <td>_ (ASCII 95)</td>
  </tr>
    <tr>
    <td>64</td>
    <td>NUL</td>
    <td>`</td>
    <td>64</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>2</td>
    <td>2</td>
    <td>` (ASCII 96)</td>
  </tr>
    <tr>
    <td>65</td>
    <td>SOH</td>
    <td>a</td>
    <td>65</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>4</td>
    <td>a (ASCII 97) </td>
  </tr>
    <tr>
    <td>66</td>
    <td>STX</td>
    <td>b</td>
    <td>66</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>4</td>
    <td>2</td>
    <td>1</td>
    <td>b (ASCII 98)</td>
  </tr>
    <tr>
    <td>67</td>
    <td>ETX</td>
    <td>c</td>
    <td>67</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>c (ASCII 99) </td>
  </tr>
    <tr>
    <td>68</td>
    <td>EOT</td>
    <td>d</td>
    <td>68</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>d (ASCII 100) </td>
  </tr>
    <tr>
    <td>69</td>
    <td>ENQ</td>
    <td>e</td>
    <td>69</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>4</td>
    <td>e (ASCII 101) </td>
  </tr>
    <tr>
    <td>70</td>
    <td>ACK</td>
    <td>f</td>
    <td>70</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>4</td>
    <td>1</td>
    <td>2</td>
    <td>f (ASCII 102)</td>
  </tr>
    <tr>
    <td>71</td>
    <td>BEL</td>
    <td>g</td>
    <td>71</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>g (ASCII 103)</td>
  </tr>
    <tr>
    <td>72</td>
    <td>BS</td>
    <td>h</td>
    <td>72</td>
    <td>1</td>
    <td>2</td>
    <td>2</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>h (ASCII 104)</td>
  </tr>
    <tr>
    <td>73</td>
    <td>HT</td>
    <td>i</td>
    <td>73</td>
    <td>1</td>
    <td>4</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>i (ASCII 105)</td>
  </tr>
    <tr>
    <td>74</td>
    <td>LF</td>
    <td>j</td>
    <td>74</td>
    <td>1</td>
    <td>4</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>j (ASCII 106)</td>
  </tr>
    <tr>
    <td>75</td>
    <td>VT</td>
    <td>k</td>
    <td>75</td>
    <td>2</td>
    <td>4</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>k (ASCII 107)</td>
  </tr>
    <tr>
    <td>76</td>
    <td>FF</td>
    <td>l</td>
    <td>76</td>
    <td>2</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>l (ASCII 108)</td>
  </tr>
    <tr>
    <td>77</td>
    <td>CR</td>
    <td>m</td>
    <td>77</td>
    <td>4</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>m (ASCII 109)</td>
  </tr>
    <tr>
    <td>78</td>
    <td>SO</td>
    <td>n</td>
    <td>78</td>
    <td>2</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>n (ASCII 110)</td>
  </tr>
    <tr>
    <td>79</td>
    <td>SI</td>
    <td>o</td>
    <td>79</td>
    <td>1</td>
    <td>3</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>o (ASCII 111)</td>
  </tr>
    <tr>
    <td>80</td>
    <td>DLE</td>
    <td>p</td>
    <td>80</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>4</td>
    <td>2</td>
    <td>p (ASCII 112)</td>
  </tr>
    <tr>
    <td>81</td>
    <td>DC1</td>
    <td>q</td>
    <td>81</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>2</td>
    <td>q (ASCII 113)</td>
  </tr>
      <tr>
    <td>82</td>
    <td>DC2</td>
    <td>r</td>
    <td>82</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>4</td>
    <td>1</td>
    <td>r (ASCII 114)</td>
  </tr>
      <tr>
    <td>83</td>
    <td>DC3</td>
    <td>s</td>
    <td>83</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>s (ASCII 115)</td>
  </tr>
      <tr>
    <td>84</td>
    <td>DC4</td>
    <td>t</td>
    <td>84</td>
    <td>1</td>
    <td>2</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>t (ASCII 116)</td>
  </tr>
      <tr>
    <td>85</td>
    <td>NAK</td>
    <td>u</td>
    <td>85</td>
    <td>1</td>
    <td>2</td>
    <td>4</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>u (ASCII 117)</td>
  </tr>
      <tr>
    <td>86</td>
    <td>SYN</td>
    <td>v</td>
    <td>86</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>v (ASCII 118)</td>
  </tr>
      <tr>
    <td>87</td>
    <td>ETB</td>
    <td>w</td>
    <td>87</td>
    <td>4</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>w (ASCII 119)</td>
  </tr>
      <tr>
    <td>88</td>
    <td>CAN</td>
    <td>x</td>
    <td>88</td>
    <td>4</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>x (ASCII 120)</td>
  </tr>
      <tr>
    <td>89</td>
    <td>EM</td>
    <td>y</td>
    <td>89</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>y (ASCII 121)</td>
  </tr>
      <tr>
    <td>90</td>
    <td>SUB</td>
    <td>z</td>
    <td>90</td>
    <td>2</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>z (ASCII 122)</td>
  </tr>
      <tr>
    <td>91</td>
    <td>ESC</td>
    <td>{</td>
    <td>91</td>
    <td>4</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>{ (ASCII 123) </td>
  </tr>
      <tr>
    <td>92</td>
    <td>FS</td>
    <td>|</td>
    <td>92</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>3</td>
    <td>| (ASCII 124)</td>
  </tr>
      <tr>
    <td>93</td>
    <td>GS</td>
    <td>}</td>
    <td>93</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>4</td>
    <td>1</td>
    <td>} (ASCII 125) </td>
  </tr>
      <tr>
    <td>94</td>
    <td>RS</td>
    <td>~</td>
    <td>94</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>~ (ASCII 126)</td>
  </tr>
      <tr>
    <td>95 (Hex 7F)</td>
    <td>US</td>
    <td>DEL</td>
    <td>95</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>DEL (ASCII 127)</td>
  </tr>
      <tr>
    <td>96 (Hex 80)</td>
    <td>FNC 3</td>
    <td>FNC 3</td>
    <td>96</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>? (ASCII 128)</td>
  </tr>
      <tr>
    <td>97 (Hex 81)</td>
    <td>FNC 2 </td>
    <td>FNC 2 </td>
    <td>97</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>ü (ASCII 129)</td>
  </tr>
      <tr>
    <td>98 (Hex 82)</td>
    <td>SHIFT</td>
    <td>SHIFT</td>
    <td>98</td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>é (ASCII 130) </td>
  </tr>
      <tr>
    <td>99 (Hex 83)</td>
    <td>CODE C</td>
    <td>CODE C</td>
    <td>99</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>a (ASCII 131)</td>
  </tr>
      <tr>
    <td>100 (Hex 84)</td>
    <td>CODE B</td>
    <td>FNC 4</td>
    <td>CODE B</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>? (ASCII 132) </td>
  </tr>
      <tr>
    <td>101 (Hex 85)</td>
    <td>FNC 4</td>
    <td>CODE A</td>
    <td>CODE A</td>
    <td>3</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>à (ASCII 133)</td>
  </tr>
      <tr>
    <td>102 (Hex 86)</td>
    <td>FNC 1 </td>
    <td>FNC 1 </td>
    <td>FNC 1 </td>
    <td>4</td>
    <td>1</td>
    <td>1</td>
    <td>1</td>
    <td>3</td>
    <td>1</td>
    <td>? (ASCII 134) </td>
  </tr>
</table>
<table width="800" border="1">
  <tr>
    <th rowspan="2" scope="col">值</th>
    <th rowspan="2" scope="col">开始符号</th>
    <th colspan="6" scope="col">图案</th>
    <th rowspan="2" scope="col">想要打印的ASCII字符</th>
  </tr>
  <tr>
    <td>条</td>
    <td>空</td>
    <td>条</td>
    <td>空</td>
    <td>条</td>
    <td>空</td>
    </tr>
  <tr>
    <td>103 (Hex 87)</td>
    <td>START (Code A)</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>4</td>
    <td>1</td>
    <td>2</td>
    <td>? (ASCII 135) </td>
  </tr>
  <tr>
    <td>104 (Hex 88)</td>
    <td>START (Code B)</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>1</td>
    <td>4</td>
    <td>? (ASCII 136)</td>
  </tr>
  <tr>
    <td>105 (Hex 89)</td>
    <td>START (Code C)</td>
    <td>2</td>
    <td>1</td>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>2</td>
    <td>‰ (ASCII 137) </td>
  </tr>
  <tr>
    <td>106 (Hex 6A)</td>
    <td>STOP (All Codes)</td>
    <td>2</td>
    <td>3</td>
    <td>3</td>
    <td>1</td>
    <td>1，1</td>
    <td>2</td>
    <td>? (ASCII 138) </td>
  </tr>
</table>
<p></p></div></div></div>

最后修改：2024 年 12 月 28 日

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EuroDai
September 23rd, 2022 at 12:57 pm

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通过一张图片能够获得多少信息？

奈落 • 2022 年 06 月 16 日

# 1. 前言

通过一张照片能够获得多少信息？可以通过本篇文章的一个例子来学习，同时也能提高保护的个人隐私的意识。

---

# 2. 原始信息

**通过这张图片我们可以得到这些信息：**

---

# 3. 条形码分析

通过对格式分析得出此条形码采用Code128格式。

### 3.1. code128详解

<a href="#excursus">**code128的字符设置参见文章底部的附录**</a>

#### 开始字符

#### 编码数据

#### 检测字符

### 3.2. 案例条形码分析

看过上述内容想必你对Code128条形码有了一定的了解，现在进入实战部分，一边对照Code128条形码字符表一边按照条形码的分区解码。

#### 开始字符

开头的6个条纹宽度为211232，可以得出条形码开始字符为start code C。

#### 编码数据区

#### 纠错码

除去最后7位停止字符，往前6个条纹宽度为411131，可以得出纠错码为102。

根据纠错码写几行代码简单验证一下被遮住的条形码的数据。

运行代码我们得到此人的学号是18723190

---

# 4. 利用Google进行社工

### 4.1. 常见Google搜索语法

#### 搜索逻辑

* 逻辑与：and
* 逻辑或：or
* 逻辑非：-
* 完整匹配："关键词"
* 通配符：* ?

#### 文件类型

`filetype:文件类型`

例如我想找一篇论文的格式模板
`论文格式 filetype:doc`

#### 指定站点

`site:指定站点`

例如我想在微博内寻找匹配美国这个关键词的页面
`"美国" site:weibo.com`

### 4.2. 实战

根据我们所得到的学号信息，把18723190作为关键字，文件类型指定为pdf查找人员的名单，我们最终得出这张证书所对应人的姓名。

`"18723190" filetype:pdf`

![搜索结果如图所示](http://cloud.nailoy.com/typecho/uploads/2022/07/4213944434.png)

通过一张图片能够获得多少信息？

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通过一张图片能够获得多少信息？

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通过一张图片能够获得多少信息？

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