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Original file line number Diff line number Diff line change 1+ <!--
2+ * @Author: LetMeFly
3+ * @Date: 2025-05-12 23:12:13
4+ * @LastEditors: LetMeFly.xyz
5+ * @LastEditTime: 2025-05-15 23:13:05
6+ -->
7+
8+
9+ + 隐蔽传输理论:[ 隐蔽通信(Covert Communication)技术概述] ( https://blog.csdn.net/weixin_42090358/article/details/107375357 )
10+
11+ 讲的是Alice和Bobs、是两个正常进行通信的角色,非法窃听者Willie从中窃取,想尽可能准确的同时尽可能不被Alice和Bob发现。
12+
13+ $$
14+ \left\{\begin{array}{l}
15+ \mathrm{H}_{0}: \mathbf{y}_{\mathrm{w}}=\mathbf{n}_{\mathrm{w}}, \\
16+ \mathrm{H}_{1}: \mathbf{y}_{\mathrm{w}}=\mathbf{x}+\mathbf{n}_{\mathrm{w}},
17+ \end{array}\right.
18+ $$
19+
20+ 其中$H_0$代表Alice没有发送信号,Willie只接收到高斯白噪声;反之,$H_1$代表Alice发送了信号,Willie观测到了有效信号和高斯白噪声的叠加信号。
21+
22+ 于是就有虚警(False Alarm)和漏检(Missed Detection),以及准确率等等一系列相关问题。
23+
24+ > 这个是完全的第三方监听,收发双方完全未知,和咱们的还不一定完全一样。
25+
26+ + [ 隐蔽传输理论] ( https://www.abc.net.au/chinese/2019-07-18/wechat-censorship-image-filtering/11322654 )
27+
28+ 基本屏蔽原理:微信有一个图片MD5黑名单,一张图片MD5在黑名单中则会被屏蔽。图片被发送后微信就会被放入光学字符识别和视觉分析的队列,如果分析结果认为这张图片敏感,那么这张图片的MD5值就会被加入索引,之后用户再尝试发送就会被屏蔽。
29+
30+ 如果一个图片出现在一篇微信已经屏蔽的文章里,这张图片就会被屏蔽,即便这张照片本身可能并不敏感。
31+
32+ + [ 微信记录,怎样才能成为证据(法制日报)] ( https://www.news.cn/politics/2021-09/12/c_1127852583.htm )
33+
34+ + [ 如何看待微信转发聊天记录任意伪造漏洞] ( https://linux.do/t/topic/164751 )
35+
36+ + [ 微信被这App破解:你收到语音消息,可能是假的] ( https://zhuanlan.zhihu.com/p/139431237 )
37+
38+ + [ 新型诈骗!你听到的好友微信语音可能是假的!(广东声公安厅)] ( https://gdga.gd.gov.cn/jwzx/jwyw/content/post_2677117.html )
39+
40+ + [ IM消息送达保证机制实现(一):保证在线实时消息的可靠投递(系列文章)] ( http://www.52im.net/thread-294-1-1.html )
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