Chris Wen's Blog

DescriptionGiven an array of points on the X-Y plane points where points[i] = [xi, yi], return the area of the largest triangle that can be formed by any three different points. Answers within 10-5 of the actual answer will be accepted. Example 1: 123Input: points = [[0,0],[0,1],[1,0],[0,2],[2,0]]Output: 2.00000Explanation: The five points are shown in the above figure. The red triangle is the largest. 12345Constraints:3 <= points.length <= 50-50 <= xi, yi <= 50All the given point...

Github Action with AzureIn this post, I will demonstrate a pipeline that is triggered only when code is pushed to the testing or main branch. The pipeline includes static code analysis, unit testing, and an image vulnerability scan. After these checks, the container image is deployed to Azure Kubernetes Service (AKS). Proccess Code RepoCode Repo Features Dev Backend Code checks - Code Analysis, Test UAT Backend CI - Test, Build, and Deploy to UAT PROD Backend CD - Deploy Backend Services to A...

After building our artifacts, we need a place to store them. Common options include Docker Hub, Nexus Repository, Google Container Registry, and Amazon Elastic Container Registry. In this section, we’ll focus on Azure Container Registry (ACR). Creating an Azure Container Registry Select the appropriate Resource Group. Enter a unique Registry Name. Leave all other settings at their default values and proceed with the creation. Configure Credentials for Local Container ManagementThere are two...

Data Warehouse ConceptWhat is Data Warehouse?Data Warehouse is a system that stores and processes large amounts of data from multiple sources to provide a single source of truth for business intelligence. It is a collection of data from various sources, including transactional systems, analytical systems, and data sources such as social media, web logs, and customer feedback. The data is transformed, cleaned, and loaded into a central repository for analysis and reporting. Data Warehouse is a...

Physical LayerThe physical layer is the lowest layer in the OSI reference model. It is responsible for the transmission of raw bits over a physical medium, defining the electrical, optical, or wireless signaling that carries the data. Its functions include bit-level transmission, modulation, synchronization, and dealing with noise and interference. 1. Basic Concepts of the Physical Layer Defines the hardware means of sending and receiving data (cables, switches, radios, etc.). Transmits dat...

Physical Layer OverviewThe physical layer is the lowest layer in the OSI model. It is responsible for the actual transmission of raw bits across the physical medium. It defines hardware specifications, signaling methods, transmission rates, and physical connections. In short, the physical layer converts digital data into signals suitable for the transmission medium. Basic Concepts of the Network LayerAlthough the physical layer is the foundation, it works closely with the network layer above ...

DHCP Protocol & DHCP SpoofingObjectiveThis experiment aims to observe abnormal behavior in the DHCP protocol by building a simpleLAN topology using Mininet and launching a DHCP spoofing attack with DHCPig [1]. Environment Component Name Version Ubuntu 18.04.1 Mininet 2.3.1b4 DHCPig - isc-dhcp-server[2] - Python3 3.6.9 Network Topology Illustration: The host 1 will act as the DHCP server; The host 2 will act as the client; The host 3 will act as the attacker. Experimen...

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...