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  <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">语言</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/System Tools/Watermark Tool.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/Master/System Tools/Watermark Tool.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link">
    gitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (In progress)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>开始</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概述</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>服务器端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>客户端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>操作指南</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>系统工具</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/Master/System Tools/Sync Tool.html" class="sidebar-link">同步工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/JMX Tool.html" class="sidebar-link">JMX工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/Watermark Tool.html" class="active sidebar-link">水印工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/Query History Visualization Tool.html" class="sidebar-link">查询历史可视化工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/Monitor and Log Tools.html" class="sidebar-link">监控与日志工具</a></li><li><a href="/zh/UserGuide/Master/System Tools/Load External Tsfile.html" class="sidebar-link">加载外部tsfile文件</a></li><li><a href="/zh/UserGuide/Master/System Tools/Performance Tracing Tool.html" class="sidebar-link">性能追踪工具</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>生态集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统设计</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="水印工具"><a href="#水印工具" class="header-anchor">#</a> 水印工具</h1> <p><strong>目录</strong></p> <ol><li><p>水印嵌入</p> <p>1.1 配置</p> <p>1.2 使用示例</p></li> <li><p>水印检测</p></li></ol> <p>这个工具提供了 1）IoTDB查询结果水印嵌入功能，2）可疑数据的水印检测功能。</p> <h2 id="_1-水印嵌入"><a href="#_1-水印嵌入" class="header-anchor">#</a> 1. 水印嵌入</h2> <h3 id="_1-1-配置"><a href="#_1-1-配置" class="header-anchor">#</a> 1.1 配置</h3> <p>IoTDB默认关闭水印嵌入功能。为了使用这个功能，第一步要做的事情是修改配置文件<code>iotdb-engine.properties</code>中的以下各项：</p> <table><thead><tr><th>名称</th> <th>示例</th> <th>解释</th></tr></thead> <tbody><tr><td>watermark_module_opened</td> <td>false</td> <td><code>true</code>打开水印嵌入功能; <code>false</code>关闭</td></tr> <tr><td>watermark_secret_key</td> <td>IoTDB*2019@Beijing</td> <td>自定义密钥</td></tr> <tr><td>watermark_bit_string</td> <td>100101110100</td> <td>要被嵌入的0-1比特串</td></tr> <tr><td>watermark_method</td> <td>GroupBasedLSBMethod(embed_row_cycle=2,embed_lsb_num=5)</td> <td>指定水印算法及其参数</td></tr></tbody></table> <p>注意：</p> <ul><li><code>watermark_module_opened</code>: 如果您想使用水印嵌入功能，请将其设置成<code>true</code>。</li> <li><code>watermark_secret_key</code>: 不能使用字符 '&amp;'。密钥长度没有限制，一般来说密钥越长，攻击难度就越高。</li> <li><code>watermark_bit_string</code>: 比特串长度没有限制（除了不能为空字符串），但是当长度过短时，水印检测可能达不到要求的显著性水平。</li> <li><code>watermark_method</code>: 现在仅支持一种算法GroupBasedLSBMethod，因此您实际上可以修改的只有这个算法的两个参数<code>embed_row_cycle</code>和<code>embed_lsb_num</code>的值：
<ul><li>均是正整数</li> <li><code>embed_row_cycle</code>控制了被嵌入水印的行占总行数的比例。<code>embed_row_cycle</code>越小，被嵌入水印的行的比例就越大。当<code>embed_row_cycle</code>等于1的时候，所有的行都将嵌入水印。</li> <li>GroupBasedLSBMethod使用LSB嵌入。<code>embed_lsb_num</code>控制了允许嵌入水印的最低有效位的数量。<code>embed_lsb_num</code>越大，数值的可变化范围就越大。</li></ul></li> <li><code>watermark_secret_key</code>, <code>watermark_bit_string</code>和<code>watermark_method</code>都不应该被攻击者获得。您需要自己负责配置文件<code>iotdb-engine.properties</code>的安全管理。</li></ul> <h3 id="_1-2-使用示例"><a href="#_1-2-使用示例" class="header-anchor">#</a> 1.2 使用示例</h3> <h4 id="第一步-创建一个新用户alice-授予读权限-然后查询"><a href="#第一步-创建一个新用户alice-授予读权限-然后查询" class="header-anchor">#</a> 第一步：创建一个新用户Alice，授予读权限，然后查询</h4> <p>一个新创建的用户默认不使用水印。因此查询结果就是数据库中的原始数据。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>.\start-cli.bat -u root -pw root
create user Alice 1234
grant user Alice privileges 'READ_TIMESERIES' on root.vehicle
exit

.\start-cli.bat -u Alice -pw 1234
select * from root
+-----------------------------------+------------------+
|                               Time|root.vehicle.d0.s0|
+-----------------------------------+------------------+
|      1970-01-01T08:00:00.001+08:00|              21.5|
|      1970-01-01T08:00:00.002+08:00|              22.5|
|      1970-01-01T08:00:00.003+08:00|              23.5|
|      1970-01-01T08:00:00.004+08:00|              24.5|
|      1970-01-01T08:00:00.005+08:00|              25.5|
|      1970-01-01T08:00:00.006+08:00|              26.5|
|      1970-01-01T08:00:00.007+08:00|              27.5|
|      1970-01-01T08:00:00.008+08:00|              28.5|
|      1970-01-01T08:00:00.009+08:00|              29.5|
|      1970-01-01T08:00:00.010+08:00|              30.5|
|      1970-01-01T08:00:00.011+08:00|              31.5|
|      1970-01-01T08:00:00.012+08:00|              32.5|
|      1970-01-01T08:00:00.013+08:00|              33.5|
|      1970-01-01T08:00:00.014+08:00|              34.5|
|      1970-01-01T08:00:00.015+08:00|              35.5|
|      1970-01-01T08:00:00.016+08:00|              36.5|
|      1970-01-01T08:00:00.017+08:00|              37.5|
|      1970-01-01T08:00:00.018+08:00|              38.5|
|      1970-01-01T08:00:00.019+08:00|              39.5|
|      1970-01-01T08:00:00.020+08:00|              40.5|
|      1970-01-01T08:00:00.021+08:00|              41.5|
|      1970-01-01T08:00:00.022+08:00|              42.5|
|      1970-01-01T08:00:00.023+08:00|              43.5|
|      1970-01-01T08:00:00.024+08:00|              44.5|
|      1970-01-01T08:00:00.025+08:00|              45.5|
|      1970-01-01T08:00:00.026+08:00|              46.5|
|      1970-01-01T08:00:00.027+08:00|              47.5|
|      1970-01-01T08:00:00.028+08:00|              48.5|
|      1970-01-01T08:00:00.029+08:00|              49.5|
|      1970-01-01T08:00:00.030+08:00|              50.5|
|      1970-01-01T08:00:00.031+08:00|              51.5|
|      1970-01-01T08:00:00.032+08:00|              52.5|
|      1970-01-01T08:00:00.033+08:00|              53.5|
+-----------------------------------+------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br></div></div><h4 id="第二步-给alice施加水印嵌入"><a href="#第二步-给alice施加水印嵌入" class="header-anchor">#</a> 第二步：给Alice施加水印嵌入</h4> <p>sql用法：<code>grant watermark_embedding to Alice</code></p> <p>您可以使用<code>grant watermark_embedding to user1,user2,...</code>来同时给多个用户施加水印嵌入。</p> <p>只有root用户有权限运行该指令。在root给Alice施加水印嵌入之后，Alice的所有查询结果都将被嵌入水印。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>.\start-cli.bat -u root -pw root
grant watermark_embedding to Alice
exit

.\start-cli.bat -u Alice -pw 1234
select * from root

+-----------------------------------+------------------+
|                               Time|root.vehicle.d0.s0|
+-----------------------------------+------------------+
|      1970-01-01T08:00:00.001+08:00|              21.5|
|      1970-01-01T08:00:00.002+08:00|              22.5|
|      1970-01-01T08:00:00.003+08:00|         23.500008|
|      1970-01-01T08:00:00.004+08:00|         24.500015|
|      1970-01-01T08:00:00.005+08:00|              25.5|
|      1970-01-01T08:00:00.006+08:00|         26.500015|
|      1970-01-01T08:00:00.007+08:00|              27.5|
|      1970-01-01T08:00:00.008+08:00|         28.500004|
|      1970-01-01T08:00:00.009+08:00|              29.5|
|      1970-01-01T08:00:00.010+08:00|              30.5|
|      1970-01-01T08:00:00.011+08:00|              31.5|
|      1970-01-01T08:00:00.012+08:00|              32.5|
|      1970-01-01T08:00:00.013+08:00|              33.5|
|      1970-01-01T08:00:00.014+08:00|              34.5|
|      1970-01-01T08:00:00.015+08:00|         35.500004|
|      1970-01-01T08:00:00.016+08:00|              36.5|
|      1970-01-01T08:00:00.017+08:00|              37.5|
|      1970-01-01T08:00:00.018+08:00|              38.5|
|      1970-01-01T08:00:00.019+08:00|              39.5|
|      1970-01-01T08:00:00.020+08:00|              40.5|
|      1970-01-01T08:00:00.021+08:00|              41.5|
|      1970-01-01T08:00:00.022+08:00|         42.500015|
|      1970-01-01T08:00:00.023+08:00|              43.5|
|      1970-01-01T08:00:00.024+08:00|         44.500008|
|      1970-01-01T08:00:00.025+08:00|          45.50003|
|      1970-01-01T08:00:00.026+08:00|         46.500008|
|      1970-01-01T08:00:00.027+08:00|         47.500008|
|      1970-01-01T08:00:00.028+08:00|              48.5|
|      1970-01-01T08:00:00.029+08:00|              49.5|
|      1970-01-01T08:00:00.030+08:00|              50.5|
|      1970-01-01T08:00:00.031+08:00|         51.500008|
|      1970-01-01T08:00:00.032+08:00|              52.5|
|      1970-01-01T08:00:00.033+08:00|              53.5|
+-----------------------------------+------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br></div></div><h4 id="第三步-撤销alice的水印嵌入"><a href="#第三步-撤销alice的水印嵌入" class="header-anchor">#</a> 第三步：撤销Alice的水印嵌入</h4> <p>sql用法：<code>revoke watermark_embedding from Alice</code></p> <p>您可以使用<code>revoke watermark_embedding from user1,user2,...</code>来同时撤销多个用户的水印嵌入。</p> <p>只有root用户有权限运行该指令。在root撤销Alice的水印嵌入之后，Alice的所有查询结果就又是数据库中的原始数据了。</p> <h2 id="_2-水印检测"><a href="#_2-水印检测" class="header-anchor">#</a> 2. 水印检测</h2> <p><code>detect-watermark.sh</code> 和 <code>detect-watermark.bat</code> 是给不同平台提供的功能相同的工具脚本。</p> <p>用法： ./detect-watermark.sh [filePath] [secretKey] [watermarkBitString] [embed_row_cycle] [embed_lsb_num] [alpha] [columnIndex] [dataType: int/float/double]</p> <p>示例： ./detect-watermark.sh /home/data/dump1.csv IoTDB*2019@Beijing 100101110100 2 5 0.05 1 float</p> <table><thead><tr><th>Args</th> <th>示例</th> <th>解释</th></tr></thead> <tbody><tr><td>filePath</td> <td>/home/data/dump1.csv</td> <td>可疑数据的文件路径</td></tr> <tr><td>secretKey</td> <td>IoTDB*2019@Beijing</td> <td>参见水印嵌入小节</td></tr> <tr><td>watermarkBitString</td> <td>100101110100</td> <td>参见水印嵌入小节</td></tr> <tr><td>embed_row_cycle</td> <td>2</td> <td>参见水印嵌入小节</td></tr> <tr><td>embed_lsb_num</td> <td>5</td> <td>参见水印嵌入小节</td></tr> <tr><td>alpha</td> <td>0.05</td> <td>显著性水平</td></tr> <tr><td>columnIndex</td> <td>1</td> <td>指定可疑数据的某一列进行检测</td></tr> <tr><td>dataType</td> <td>float</td> <td>指定检测列的数据类型；int/float/double任选其一</td></tr></tbody></table> <p>注意：</p> <ul><li><p><code>filePath</code>: 您可以使用export-csv工具来生成这样的数据文件。第一行是表头， 第一列是时间列。文件中的数据示例如下：</p> <table><thead><tr><th>Time</th> <th>root.vehicle.d0.s1</th> <th>root.vehicle.d0.s1</th></tr></thead> <tbody><tr><td>1970-01-01T08:00:00.001+08:00</td> <td>100</td> <td>null</td></tr> <tr><td>...</td> <td>...</td> <td>...</td></tr></tbody></table></li> <li><p><code>watermark_secret_key</code>, <code>watermark_bit_string</code>, <code>embed_row_cycle</code>和<code>embed_lsb_num</code>应该和水印嵌入过程使用的值保持一致。</p></li> <li><p><code>alpha</code>: 取值范围[0,1]。水印检测基于显著性检验，<code>alpha</code>越小，没有嵌入水印的数据被检测成嵌入水印的可能性越低，从而检测出嵌入水印的结果的可信度越高。</p></li> <li><p><code>columnIndex</code>: 正整数</p></li></ul></div> <div class="page-nav"><p class="inner"><span class="prev">
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