Chris Wen's Blog

DHCP Protocol & DHCP SpoofingDHCP Protocol OverviewThe Dynamic Host Configuration Protocol (DHCP) is a network management protocol used onIP networks to automatically assign IP addresses and other configuration parameters to devicesusing a client-server model [1]. Layer: DHCP operates at the Application layer in the TCP/IP model and uses UDP as itstransport protocol [2].Ports: The server uses UDP port 67, and the client uses UDP port 68 [2]. Primary Function Automatic IP Configuration: ...

Malware ReviewThis article introduces two major malware families, Zeus and Fareit. Zeus is a banking trojanthat steals online financial credentials through techniques such as keylogging and formgrabbing. Fareit is a credential-stealing trojan that collects passwords, usernames, and walletdata, often delivering other malware as well. The study outlines their impacts on target systemsand highlights key traffic patterns, providing insight into how these threats can be identifiedthrough network a...

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...

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 ...

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...

Python Basic Syntax Cheat SheetA concise reference for Python beginners and developers coming from languages like JavaScript, Java, or C++. 1. Variables & Data Types12345678x = 10 # inty = 3.14 # floatname = "Alice" # stringis_valid = True # booleanitems = [1, 2, 3] # listdata = {"a": 1} # dictnums = (1, 2, 3) # tupleunique = {1, 2, 3} # set Type Checking12type(x) # <class 'int'>isins...

OverviewMongoDB is a document-oriented NoSQL database that stores data in flexible, JSON-like documents (Wikipedia Contributors 2019). Unlike traditional relational databases, MongoDB does not require a predefined schema, allowing for dynamic and hierarchical data structures. This flexibility makes it particularly suitable for applications that handle diverse and evolving data formats, such as content management systems, real-time analytics platforms, and Internet of Things (IoT) applications...

MongoDB Basic InformationMongoDB is a popular NoSQL database known for its flexibility, scalability, and ease of use. It stores data in a JSON-like format called BSON (Binary JSON), which allows for dynamic schemas and makes it easy to work with complex data structures. Key Features of MongoDB Document-Oriented Storage: MongoDB stores data in collections of documents, which can have varying structures. This allows for greater flexibility compared to traditional relational databases. Scalabili...