[TRANSLATION] translate CS161.md (#269)

* translate CS161

* fix a typo

* update CS161.en.md

docs/系统安全/CS161.en.md

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+# UCB CS161: Computer Security
+
+## Descriptions
+
+- Offered by: UC Berkeley
+- Prerequisites: CS61A, CS61B, CS61C
+- Programming Languages: C, Go
+- Difficulty: 🌟🌟🌟🌟🌟
+- Class Hour: 150 Hours
+
+Computer Security course from UC Berkeley, devided into 5 parts:
+
+- Security principles: how to design a secure system
+- Memory safety: buffer overflow attack
+- Cryptography: symmetric encryption, asymmetric encryption, MAC, digital signature .........
+- Web: SQL-injection, XSS, XSRF .......
+- Networking: attacks for each layer
+
+The most impressive part to me is Project2, which requires you to design and implement a secure file sharing system in Go. It took me three full days to complete this extremely difficult project, with over 3 thousand lines of code. Such an intensive development experience can greatly enhance your ability to design and implement a secure system.
+
+In 2020 summer semester, the lecture recordings are posted publicly, which can be found in the links below.
+
+## Course Resources
+
+- Course Website: <https://su20.cs161.org/>
+- Recordings: refer to the course website
+- Textbooks: <https://textbook.cs161.org/>
+- Assignments: 7 online HWs + 3 Labs + 3 Projects
+
+## Personal Resources
+
+All the resources and assignments used by @PKUFlyingPig in this course are maintained in [PKUFlyingPig/UCB-CS161 - GitHub](https://github.com/PKUFlyingPig/UCB-CS161).

docs/系统安全/CS161.md

@@ -16,7 +16,7 @@
 - Web: SQL-injection, XSS, XSRF .......
 - Networking: attacks for each layer
 
-这门课让我印象最为深刻的部分是 Project2，让你用 Go 语言设计和实现一个安全的文件分享系统。我花了整整三天才完成了这个非常虐的 Project，总代码量超过 3k 行。在这样密集型的开发过程中，能极大地锻炼你设计和实现一个安全系统的能力。
+这门课让我印象最为深刻的部分是 Project2，让你用 Go 语言设计和实现一个安全的文件分享系统。我花了整整三天才完成了这个非常虐的 Project，总代码量超过 3k 行。这样密集型的开发过程，能极大地锻炼你设计和实现一个安全系统的能力。
 
 2020 年夏季学期的版本开源了课程录影，大家可以在下面的课程网站链接里找到。