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364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button><div class="arrow end"></div></div><div class="vp-toc-wrapper"><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#水印工具">水印工具</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#水印嵌入">水印嵌入</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#水印检测">水印检测</a></li><!----><!--]--></ul></li><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h2 id="水印工具" tabindex="-1"><a class="header-anchor" href="#水印工具"><span>水印工具</span></a></h2><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><h3 id="水印嵌入" tabindex="-1"><a class="header-anchor" href="#水印嵌入"><span>水印嵌入</span></a></h3><h4 id="配置" tabindex="-1"><a class="header-anchor" href="#配置"><span>配置</span></a></h4><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 &#39;&amp;&#39;。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><h4 id="使用示例" tabindex="-1"><a class="header-anchor" href="#使用示例"><span>使用示例</span></a></h4><ul><li>第一步：创建一个新用户 Alice，授予读权限，然后查询</li></ul><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-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>.\start-cli.bat -u root -pw root
create user Alice &#39;1234&#39;
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" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>第二步：给 Alice 施加水印嵌入</li></ul><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-text line-numbers-mode" data-ext="text" data-title="text"><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" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>第三步：撤销 Alice 的水印嵌入</li></ul><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><h3 id="水印检测" tabindex="-1"><a class="header-anchor" href="#水印检测"><span>水印检测</span></a></h3><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><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：</li></ul><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><ul><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><!--[--><!----><!--]--><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/zh/UserGuide/V0.13.x/Maintenance-Tools/Watermark-Tool.md" rel="noopener noreferrer" target="_blank" aria-label="发现错误？在 GitHub 上编辑此页" class="nav-link vp-meta-label"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" 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