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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>PacketMania</title>
<icon>https://www.packetmania.net/en/icon.png</icon>
<subtitle>Technology | Knowledge | Sharing</subtitle>
<link href="https://www.packetmania.net/en/atom.xml" rel="self"/>
<link href="https://www.packetmania.net/en/"/>
<updated>2024-04-30T07:24:06.205Z</updated>
<id>https://www.packetmania.net/en/</id>
<author>
<name>Zixi</name>
</author>
<generator uri="https://hexo.io/">Hexo</generator>
<entry>
<title>Purdue MA 26500 Spring 2022 Final Exam Solutions</title>
<link href="https://www.packetmania.net/en/2024/04/18/Purdue-MA265-2022-Spring-Final/"/>
<id>https://www.packetmania.net/en/2024/04/18/Purdue-MA265-2022-Spring-Final/</id>
<published>2024-04-19T06:51:21.000Z</published>
<updated>2024-04-30T07:24:06.205Z</updated>
<summary type="html"><p>Here comes the solution and analysis for Purdue MA 26500 Spring 2022 Final exam. This exam covers all topics from Chapter 1 (Linear Equations in Linear Algebra) to Chapter 7 Section 1 (Diagonalization of Symmetric Matrices).</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="Linear Algebra" scheme="https://www.packetmania.net/en/tags/Linear-Algebra/"/>
</entry>
<entry>
<title>Purdue CS24000 Fall 2018 Midterm II Solutions</title>
<link href="https://www.packetmania.net/en/2024/03/27/Purdue-CS240-2018-Fall-Midterm2/"/>
<id>https://www.packetmania.net/en/2024/03/27/Purdue-CS240-2018-Fall-Midterm2/</id>
<published>2024-03-28T04:47:01.000Z</published>
<updated>2024-03-29T01:41:24.331Z</updated>
<summary type="html"><p>Purdue University CS24000 is an undergraduate-level course that teaches students programming principles and techniques for problem-solving in the C programming language. Here are the solution and study notes for the Fall 2018 Midterm 2 exam.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="C/C++ Programming" scheme="https://www.packetmania.net/en/tags/C-C-Programming/"/>
</entry>
<entry>
<title>Programming in C Exam Review and Practices (II)</title>
<link href="https://www.packetmania.net/en/2024/03/26/C-Prog-Exam-Review-Practices-2/"/>
<id>https://www.packetmania.net/en/2024/03/26/C-Prog-Exam-Review-Practices-2/</id>
<published>2024-03-27T05:47:48.000Z</published>
<updated>2024-03-29T01:52:43.784Z</updated>
<summary type="html"><p>Here is a series of general study guides to college-level C programming courses. This is the second part covering dynamic memory allocation, advanced pointer operations, recursion, linked list and tree common functions, etc.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="C/C++ Programming" scheme="https://www.packetmania.net/en/tags/C-C-Programming/"/>
</entry>
<entry>
<title>Purdue CS24000 2022 Summer Final Exam Solutions</title>
<link href="https://www.packetmania.net/en/2024/03/24/Purdue-CS240-2022-Summer-Final/"/>
<id>https://www.packetmania.net/en/2024/03/24/Purdue-CS240-2022-Summer-Final/</id>
<published>2024-03-25T02:04:07.000Z</published>
<updated>2024-03-27T03:24:28.070Z</updated>
<summary type="html"><p>Purdue University CS24000 is an undergraduate-level course that teaches students programming principles and techniques for problem-solving in the C programming language. Here are the solutions and study notes for the 2022 and 2023 Final exams.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="C/C++ Programming" scheme="https://www.packetmania.net/en/tags/C-C-Programming/"/>
</entry>
<entry>
<title>Purdue MA 26500 Spring 2022 Midterm II Solutions</title>
<link href="https://www.packetmania.net/en/2024/02/29/Purdue-MA265-2022-Spring-Midterm2/"/>
<id>https://www.packetmania.net/en/2024/02/29/Purdue-MA265-2022-Spring-Midterm2/</id>
<published>2024-03-01T07:41:24.000Z</published>
<updated>2024-04-22T04:34:26.357Z</updated>
<summary type="html"><p>Here comes the solution and analysis for Purdue MA 26500 Spring 2022 Midterm II. This second midterm covers topics in Chapter 4 (Vector Spaces) and Chapter 5 (Eigenvalues and Eigenvectors) of the textbook.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="Linear Algebra" scheme="https://www.packetmania.net/en/tags/Linear-Algebra/"/>
</entry>
<entry>
<title>Purdue MA 26500 Spring 2023 Midterm II Solutions</title>
<link href="https://www.packetmania.net/en/2024/02/29/Purdue-MA265-2023-Spring-Midterm2/"/>
<id>https://www.packetmania.net/en/2024/02/29/Purdue-MA265-2023-Spring-Midterm2/</id>
<published>2024-03-01T07:21:56.000Z</published>
<updated>2024-04-22T04:35:13.634Z</updated>
<summary type="html"><p>Here comes the solution and analysis for Purdue MA 26500 Spring 2023 Midterm II. This second midterm covers topics in Chapter 4 (Vector Spaces) and Chapter 5 (Eigenvalues and Eigenvectors) of the textbook.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="Linear Algebra" scheme="https://www.packetmania.net/en/tags/Linear-Algebra/"/>
</entry>
<entry>
<title>Programming in C Exam Review and Practices (I)</title>
<link href="https://www.packetmania.net/en/2024/02/28/C-Prog-Exam-Review-Practices-1/"/>
<id>https://www.packetmania.net/en/2024/02/28/C-Prog-Exam-Review-Practices-1/</id>
<published>2024-02-29T07:10:00.000Z</published>
<updated>2024-03-27T05:46:39.260Z</updated>
<summary type="html"><p>Here is a series of general study guides to college-level C programming courses. This is the first part covering compilation and linking, file operations, typedef, structures, string operations, basic pointer operations, etc.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="C/C++ Programming" scheme="https://www.packetmania.net/en/tags/C-C-Programming/"/>
</entry>
<entry>
<title>Purdue CS24000 2022 and 2023 Summer Midterm Exam Solutions</title>
<link href="https://www.packetmania.net/en/2024/02/25/Purdue-CS240-2022-2023-Summer-Midterm/"/>
<id>https://www.packetmania.net/en/2024/02/25/Purdue-CS240-2022-2023-Summer-Midterm/</id>
<published>2024-02-26T00:16:50.000Z</published>
<updated>2024-03-25T02:08:35.159Z</updated>
<summary type="html"><p>Purdue University CS24000 is an undergraduate-level course that teaches students programming principles and techniques for problem-solving in the C programming language. Here are the solutions and study notes for the 2022 and 2023 Midterm exams.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="C/C++ Programming" scheme="https://www.packetmania.net/en/tags/C-C-Programming/"/>
</entry>
<entry>
<title>Purdue CS24000 Fall 2018 Midterm I Solutions</title>
<link href="https://www.packetmania.net/en/2024/02/24/Purdue-CS240-2018-Fall-Midterm1/"/>
<id>https://www.packetmania.net/en/2024/02/24/Purdue-CS240-2018-Fall-Midterm1/</id>
<published>2024-02-25T06:41:38.000Z</published>
<updated>2024-03-01T06:12:40.736Z</updated>
<summary type="html"><p>Purdue University CS24000 is an undergraduate-level course that teaches students programming principles and techniques for problem-solving in the C programming language. Here are the solution and study notes for the Fall 2018 Midterm 1 exam.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="C/C++ Programming" scheme="https://www.packetmania.net/en/tags/C-C-Programming/"/>
</entry>
<entry>
<title>Purdue MA 26500 Fall 2022 Midterm II Solutions</title>
<link href="https://www.packetmania.net/en/2024/02/10/Purdue-MA265-2022-Fall-Midterm2/"/>
<id>https://www.packetmania.net/en/2024/02/10/Purdue-MA265-2022-Fall-Midterm2/</id>
<published>2024-02-11T06:44:07.000Z</published>
<updated>2024-04-01T21:25:39.772Z</updated>
<summary type="html"><p>Here comes the solution and analysis for Purdue MA 26500 Fall 2022 Midterm II. This second midterm covers topics in Chapter 4 (Vector Spaces) and Chapter 5 (Eigenvalues and Eigenvectors) of the textbook.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="Linear Algebra" scheme="https://www.packetmania.net/en/tags/Linear-Algebra/"/>
</entry>
<entry>
<title>Purdue MA 26500 Fall 2023 Midterm I Solutions</title>
<link href="https://www.packetmania.net/en/2024/01/28/Purdue-MA265-2023-Fall-Midterm1/"/>
<id>https://www.packetmania.net/en/2024/01/28/Purdue-MA265-2023-Fall-Midterm1/</id>
<published>2024-01-29T04:18:14.000Z</published>
<updated>2024-03-08T17:35:27.099Z</updated>
<summary type="html"><p>This is the 3rd study notes post for the college linear algebra course. Here is the review of Purdue MA 26500 Fall 2023 midterm I. I provide solutions to all exam questions as well as concise explanations.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="Linear Algebra" scheme="https://www.packetmania.net/en/tags/Linear-Algebra/"/>
</entry>
<entry>
<title>Purdue MA 26500 Spring 2023 Midterm I Solutions</title>
<link href="https://www.packetmania.net/en/2024/01/23/Purdue-MA265-2023-Spring-Midterm1/"/>
<id>https://www.packetmania.net/en/2024/01/23/Purdue-MA265-2023-Spring-Midterm1/</id>
<published>2024-01-23T19:04:43.000Z</published>
<updated>2024-03-08T17:35:35.436Z</updated>
<summary type="html"><p>This is the 2nd study notes post for the college linear algebra course. Here is the review of Purdue MA 26500 Spring 2023 midterm I. I provide solutions to all exam questions as well as concise explanations.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="Linear Algebra" scheme="https://www.packetmania.net/en/tags/Linear-Algebra/"/>
</entry>
<entry>
<title>Purdue MA 26500 Fall 2022 Midterm I Solutions</title>
<link href="https://www.packetmania.net/en/2024/01/19/Purdue-MA265-2022-Fall-Midterm1/"/>
<id>https://www.packetmania.net/en/2024/01/19/Purdue-MA265-2022-Fall-Midterm1/</id>
<published>2024-01-20T06:55:57.000Z</published>
<updated>2024-03-08T17:34:38.267Z</updated>
<summary type="html"><p>Linear algebra provides mathematical tools to represent and analyze data and models in higher dimensions. It is essential for machine learning, computer graphics, control theory, and other scientific and engineering fields. Starting from this post, I will provide study guides and solutions to Purdue MA26500 exams in the last few semesters.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="Linear Algebra" scheme="https://www.packetmania.net/en/tags/Linear-Algebra/"/>
</entry>
<entry>
<title>RSA: Attack and Defense (II)</title>
<link href="https://www.packetmania.net/en/2023/11/17/RSA-attack-defense-2/"/>
<id>https://www.packetmania.net/en/2023/11/17/RSA-attack-defense-2/</id>
<published>2023-11-18T03:37:22.829Z</published>
<updated>2023-11-19T21:07:00.761Z</updated>
<summary type="html"><p>This article first supplements two specific integer factorization methods - Fermat's factorization method and Pollard's rho algorithm, explaining the essence of their algorithms and applicable scenarios, and provides a Python reference implementation. Next, it analyzes in detail a classic low private exponent attack - Wiener's attack, elaborating on the mathematical basis, the attack principle, and the attack procedure, with a complete Python program. The article also cites the latest research paper proposing a new upper bound for the private exponent when Wiener's attack is successful and verifies the correctness of this limit with a test case.</summary>
<category term="Technical Know-how" scheme="https://www.packetmania.net/en/categories/Technical-Know-how/"/>
<category term="Cryptography" scheme="https://www.packetmania.net/en/tags/Cryptography/"/>
<category term="Network Security" scheme="https://www.packetmania.net/en/tags/Network-Security/"/>
<category term="Python Programming" scheme="https://www.packetmania.net/en/tags/Python-Programming/"/>
</entry>
<entry>
<title>The Inductive Proof and Applications of Fermat's Little Theorem</title>
<link href="https://www.packetmania.net/en/2023/11/14/Fermats-Little-Theorem/"/>
<id>https://www.packetmania.net/en/2023/11/14/Fermats-Little-Theorem/</id>
<published>2023-11-15T07:52:56.000Z</published>
<updated>2023-11-18T03:17:55.636Z</updated>
<summary type="html"><p>In the history of mathematics, Pierre de Fermat was a special figure. His formal occupation was as a lawyer, but he was exceptionally fond of mathematics. Although an amateur, Fermat’s achievements in mathematics were no less than those of professional mathematicians of the same era. He contributed to modern calculus, analytic geometry, probability, and number theory. Especially in the field of number theory, Fermat was most interested and achieved the most outstanding results.</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="Cryptography" scheme="https://www.packetmania.net/en/tags/Cryptography/"/>
</entry>
<entry>
<title>TLS 1.3 and the Coming NIST Mandate</title>
<link href="https://www.packetmania.net/en/2023/08/21/TLS1-3-intro/"/>
<id>https://www.packetmania.net/en/2023/08/21/TLS1-3-intro/</id>
<published>2023-08-22T02:50:26.000Z</published>
<updated>2024-03-01T05:53:50.984Z</updated>
<summary type="html"><p>TLS (Transport Layer Security) is a cryptographic protocol to secure network communication. TLS 1.3 is the latest version of the TLS protocol, succeeding TLS 1.2. TLS 1.3 aims to provide more robust security, higher privacy protection, as well as better performance than previous versions. Here is a brief introduction to TLS 1.3. Also, we discuss NIST's requirement for TLS 1.3 readiness and give examples of enabling TLS 1.3 in some commonly used web servers.</summary>
<category term="Technical Know-how" scheme="https://www.packetmania.net/en/categories/Technical-Know-how/"/>
<category term="Cryptography" scheme="https://www.packetmania.net/en/tags/Cryptography/"/>
<category term="Network Security" scheme="https://www.packetmania.net/en/tags/Network-Security/"/>
</entry>
<entry>
<title>RSA: Attack and Defense (I)</title>
<link href="https://www.packetmania.net/en/2023/03/16/RSA-attack-defense/"/>
<id>https://www.packetmania.net/en/2023/03/16/RSA-attack-defense/</id>
<published>2023-03-17T04:00:32.000Z</published>
<updated>2023-11-19T07:09:28.150Z</updated>
<summary type="html"><p>RSA is a public-key cryptosystem built on top of an asymmetric encryption algorithm, which was jointly invented by three cryptographers and computer scientists at the Massachusetts Institute of Technology in 1977. The RSA public-key encryption algorithm and cryptosystem provide data confidentiality and signature verification functions widely used on the Internet. Since its birth, RSA has become a major research object of modern cryptography. Many cryptanalysts and information security experts have been studying its possible theoretical flaws and technical loopholes to ensure security and reliability in practical applications.</summary>
<category term="Technical Know-how" scheme="https://www.packetmania.net/en/categories/Technical-Know-how/"/>
<category term="Cryptography" scheme="https://www.packetmania.net/en/tags/Cryptography/"/>
<category term="Network Security" scheme="https://www.packetmania.net/en/tags/Network-Security/"/>
<category term="Python Programming" scheme="https://www.packetmania.net/en/tags/Python-Programming/"/>
</entry>
<entry>
<title>Notes on Using uClibc Standard Library in Embedded Linux System</title>
<link href="https://www.packetmania.net/en/2023/03/10/uClibc-tips/"/>
<id>https://www.packetmania.net/en/2023/03/10/uClibc-tips/</id>
<published>2023-03-11T07:38:37.000Z</published>
<updated>2023-09-16T00:19:30.846Z</updated>
<summary type="html"><p><a href="https://www.uclibc.org">uClibc</a> is a small and exquisite C standard library for embedded Linux systems. It is widely used in the development of low-end embedded systems and Internet of Things devices. Here are some recent experiences to provide convenience for engineers who need to solve similar problems or meet corresponding requirements.</summary>
<category term="Technical Know-how" scheme="https://www.packetmania.net/en/categories/Technical-Know-how/"/>
<category term="C/C++ Programming" scheme="https://www.packetmania.net/en/tags/C-C-Programming/"/>
<category term="System Programming" scheme="https://www.packetmania.net/en/tags/System-Programming/"/>
<category term="Cryptography" scheme="https://www.packetmania.net/en/tags/Cryptography/"/>
<category term="Computer Communications" scheme="https://www.packetmania.net/en/tags/Computer-Communications/"/>
<category term="TCP/IP" scheme="https://www.packetmania.net/en/tags/TCP-IP/"/>
</entry>
<entry>
<title>Does Diffie-Hellman Key Exchange Use a Technology Similar to RSA?</title>
<link href="https://www.packetmania.net/en/2022/11/21/DH-and-RSA/"/>
<id>https://www.packetmania.net/en/2022/11/21/DH-and-RSA/</id>
<published>2022-11-22T06:38:45.000Z</published>
<updated>2023-11-10T22:04:06.277Z</updated>
<summary type="html"><p>Recently, at a WPA3 technology introduction meeting within the R&amp;D team, the speaker mentioned that the OWE technology for encrypted wireless open networks is based on Diffie-Hellman key exchange, and casually said that Diffie-Hellman key exchange is using technology similar to RSA. This statement is wrong!</summary>
<category term="Study Notes" scheme="https://www.packetmania.net/en/categories/Study-Notes/"/>
<category term="Cryptography" scheme="https://www.packetmania.net/en/tags/Cryptography/"/>
<category term="Network Security" scheme="https://www.packetmania.net/en/tags/Network-Security/"/>
</entry>
<entry>
<title>Please Stop Using TLS 1.0 and TLS 1.1 Now!</title>
<link href="https://www.packetmania.net/en/2022/11/10/Stop-TLS1-0-TLS1-1/"/>
<id>https://www.packetmania.net/en/2022/11/10/Stop-TLS1-0-TLS1-1/</id>
<published>2022-11-11T07:56:28.000Z</published>
<updated>2024-01-28T00:50:49.244Z</updated>
<summary type="html"><p>In March 2021, the Internet Engineering Task Force (IETF) released <a href="https://tools.ietf.org/html/rfc8996">RFC 8996</a>, classified as a current best practice, officially announcing the deprecation of the TLS 1.0 and TLS 1.1 protocols. If your applications and web services are still using these protocols, please stop immediately and update to TLS 1.2 or TLS 1.3 protocol versions as soon as possible to eliminate any possible security risks.</summary>
<category term="Technology Review" scheme="https://www.packetmania.net/en/categories/Technology-Review/"/>
<category term="Cryptography" scheme="https://www.packetmania.net/en/tags/Cryptography/"/>
<category term="Network Security" scheme="https://www.packetmania.net/en/tags/Network-Security/"/>
</entry>
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