Chris Wen's Blog

BackgroundMachine learning (ML) components are increasingly being deployed in critical applications, form computer vision to cybersecurity. However, the data-driven nature of ML introduces new security challenges compared to traditional knowledge-based AI systems. Adversaries can exploit vulnerabilities in ML models through a variety of adversarial attacks, posing significant risks to the integrity, availability, and confidentiality of these systems. Key Attack TypesThe taxonomy of adversaria...

Comparative Analysis of Classification AlgorithmsAbstractThis report provides a comprehensive analysis of the performance of three popular classification algorithms:Decision Tree, Logistic Regression, Naive Bayes, Random Forest, Support Vector Machines (SVM) and Multilayer Perceptron.The purpose of the study is to evaluate and compare these algorithms based on key performance metrics such as accuracy, precision, recall, F1-score, and false alarm rate (www.evidentlyai.com, n.d.), using two dif...

Dataset IntroductionNSL-KDDThe NSL-KDD dataset is a dataset for intrusion detection, which is a type of supervised learning problem. It consists of a large number of network traffic records that are labeled as either normal or malicious. The dataset contains a total of 41,478 network traffic records, which are categorized into 10 different types of attacks, such as DoS, Probe, U2R, R2L, etc. The dataset is publicly available and can be downloaded from the following link: https://www.unb.ca/ci...

BacktrackingBacktracking is a general algorithmic technique that considers searching every possible combination in order to solve a computational problem. It is often used for solving constraint satisfaction problems, such as puzzles, combinatorial problems, and optimization problems. PermutationsThe problem of generating all permutations of a given list of distinct integers can be solved using backtracking. The idea is to build the permutations incrementally and explore each possibility recu...

Dynamic ProgrammingDynamic programming is a method for solving complex problems by breaking them down into simpler subproblems, storing the results of those subproblems to avoid redundant work. It is particularly useful for optimization problems where the solution can be expressed as a combination of solutions to subproblems. Fibonacci SequenceThe Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones, usually starting with 0 and 1. The nth Fibonacci ...

SearchSearch is a fundamental operation in computer science that involves finding a specific element or value within a data structure. There are various search algorithms, each with its own advantages and disadvantages depending on the context and the type of data structure being used. Some common search algorithms include: Linear Search: This algorithm checks each element in the data structure sequentially until it finds the target element or reaches the end of the structure. It has a time ...

Divide and Conquer AlgorithmHanota TowerThe Hanota Tower, also known as the Tower of Hanoi, is a mathematical puzzle that consists of three rods and a number of disks of different sizes. The objective is to move the entire stack of disks from one rod to another, following these rules: Only one disk can be moved at a time. Each move consists of taking the upper disk from one of the stacks and placing it on top of another stack or on an empty rod. No disk may be placed on top of a smaller disk...

SortStable Sort: Stable sort is a sorting algorithm that preserves the relative order of equal elements in the sorted output.Local Sort: Local sort is a sorting algorithm that sorts elements in a small region of the list. Bubble SortBubble sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements and swaps them if they are in the wrong order. The pass through the list is repeated until the list is sorted. Stable Sort: YesLocal Sort: Yes 12Time compl...

Regular Expression ConceptionA regular expression (regex) is a sequence of characters that defines a search pattern. It is commonly used for string matching and manipulation in various programming languages and tools. Regular expressions allow you to search for specific patterns in text, such as email addresses, phone numbers, or any other string format.Example:12# A regex pattern to match email addresses^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$ Regular Expression SyntaxBasic...

Shell ConceptionA shell is a command-line interface that allows users to interact with the operating system. It provides a way to execute commands, run scripts, and manage files and processes. The shell acts as an intermediary between the user and the operating system, interpreting user input and executing the corresponding commands. 12345678cat /etc/shells# List of valid login shells:/bin/sh/bin/bash/bin/rbash/bin/dash/bin/zsh/bin/ksh example:1234# Check the current shellecho $SHELL # Change...