메모리허브

Improving memory involves understanding how the brain processes and retains information, and using techniques and habits to enhance these processes.The Big PictureThink of your brain as a library and your memory as the cataloging system. To improve your memory, you need to ensure that the library is well-organized, frequently used, and well-maintained.Core ConceptsAttention and Focus: Pay full a..

A subnet, or subnetwork, is a segmented piece of a larger network that isolates specific groups of devices to improve performance and enhance security.The Big PictureImagine you have a large office building with many departments: finance, marketing, IT, etc. To organize and manage them better, you allocate specific floors or sections to each department. Similarly, in a network, a subnet allows y..

Clean Architecture is a software design philosophy that aims to create systems that are easy to maintain, flexible, and scalable by organizing code into layers with clear separation of concerns.The Big PictureImagine building a house. You wouldn't want the plumbing mixed with the electrical wiring, or the living room walls made of random materials without a clear structure. Clean Architecture is..

The Singleton Pattern ensures a class has only one instance and provides a global point of access to that instance, like having a single captain of a ship who is the only one steering it.The Big PictureImagine you have a ship, and you want to make sure there's only one captain in charge. If there were multiple captains, they'd give conflicting orders, causing chaos. In programming, sometimes we ..

Design patterns in programming are like blueprints for solving common problems in software design, helping developers create more efficient and maintainable code by following proven solutions.The Big PictureImagine you're building a house. Instead of inventing a new way to build every time, you follow blueprints that experienced architects have used successfully. Similarly, in programming, desig..

Jira is a tool for managing projects and tracking tasks, often used in software development.The Big PictureImagine you are the manager of a busy kitchen in a restaurant. You need to keep track of all the orders coming in, which chefs are working on what dishes, and how long each dish is taking. To keep everything organized, you might use a big whiteboard to write down all the orders and their st..

The factory pattern in Java is like a factory in real life where you create different products (objects) without specifying the exact class of the object that will be created.The Big PictureImagine you own a toy factory. This factory can produce different types of toys, but you don't want to worry about the details of how each toy is made every time you need a new toy. Instead, you have a method..

요약1 소프트웨어 크랙을 하려면 debugger로 기존 소프트웨어 로직을 배우려고 reverse-engineering 한다.2 코드 예제에서 라이센스를 받은 사용자는 registrationcode, registrationname을 받는다. 그리고 유효한 코드/명인지 체크를 해서 유효하면 true 결과를 받는다.3 크랙커는 해당 소스 코드가 없으니까 debugger로 바이너리 코드를 분해해서 (.exe, .dll 파일 / .app Unix, Mac) 사용자 등록 로직을 찾는다.4 여기서 가장 어려운 단계는 수만줄의 코드에서 사용자 등록 로직을 찾는 일이다.5 등록 로직을 찾은 후바이너리를 수정 또는(이 방법을 사용하면 기존 exe 바이너리 파일을 수정하기 때문에 digital signature가 깨져서 판..

Source CodeParsing step (scanned, split up, groped) aka. lexical (isolation from the sentence containing it) analysis. (grammar or meaning of text not taken into context. Just the meaning of the words themselves)Lexical Analysis phase1 Scans codeSource text is considered as a chunk of string text.scanner reads the text one character at a time.for each char. it marks the line and position of wher..

컴퓨터-CPU(프로세서)-작업-프로세스프로세서(처리기,CPU)에서 처리하는 프로그램.작업 또는 타스크라고도 한다.프로세스 상태 전이프로세스가 시스템 내에 있는 동안 상태가 변하는 것.PCB(Process Control Block)HAS address, state, time, id프로세스 상태 전이제출 : 작업이 시스템에 제출된 상태접수 : 제출된 작업이 디스크에 저장된 상태준비 : 프로세스가 프로세서를 할당받기 전에 대기중인 상태. 잡스케줄러가 접수에서 준비 상태로 전이함.실행 : 프로세스가 프로세서를 할당받아 실행되는 상태.대기 : 프로세스에 입 출력이 필요하면 현재 실행 중인 프로세스가 중단되고, 입 출력이 끝날 때까지 대기하고 있는다.종료 : 프로세스의 실행이 끝나고 프로세스 할당이 해제된 상태.W..