Study Notes

Binary Exploitation
BSD
- FreeBSD
CCTV
Computer Science
Cryptography
- Asymmetric-Encryption
  - RSA
- Encoding
  - Base64
  - URL Encoding
- Hash Functions
  - MD5
- Password Hashing
  - LM Hash
- Symmetric Encryption
  - Block Ciphers
    - AES
    - DES
Defensive Security
- Elastic
- Malware Analysis
- MITRE
  - MITRE ATT&CK
- Splunk
DIY
- Cantenna
GNU / Linux
- Story
- Debian
  - Debian Package Manager
  - Firmware
- GNU coreutils
  - What is GNU coreutils
  - Basic operations
    - cp
    - dd
    - mv
    - rm
    - shred
  - Changing file attributes
    - chgrp
    - chmod
    - chown
    - touch
  - Directory listing
    - dir
    - ls
    - vdir
  - File permissions
  - File space usage
    - df
    - du
  - Output of entire files
    - base64
    - cat
    - tac
  - Output of parts of files
    - head
    - tail
  - Printing text
    - echo
    - printf
  - Process control
    - kill
  - Redirection
    - tee
  - Special file types
    - mkdir
  - Summarizing files
    - wc
  - System context
    - arch
    - date
    - hostname
    - uname
    - uptime
  - User information
    - groups
    - id
    - logname
    - pinky
    - users
    - who
    - whoami
  - Working context
    - pwd
- Linux Networking
- Shell
  - ls alieas
  - Shell Commands
  - Shell Variables
- System
  - services (daemons)
- Users
  - su (switch user)
  - Users
Hardware
- ESP32
- GPIO
- Integrated circuit
- microcontroller
- PN532
- RC522
- RTOS
K&R
- Ch 1 - A Tutorial Introduction
macOS
Networking
- Ethernet
- Networking Fundamentals
- Ports
- Pivoting
- Protocols
  - Networking Protocol?
  - ARP
  - DHCP
  - DNS
    - DNS Attacks
    - DNS Fundamentals
  - FTP
  - ICMP
  - RTSP
  - SSH
    - (0) What is SSH
    - OpenSSH
  - TCP
  - UDP
- Proxy
  - Proxy Fundamentals
- VPN
- Wireless
  - (0) Fundamentals
  - Bluetooth
  - NFC
  - RFID
  - Wi-Fi
    - Wi-Fi Alliance
Offensive Security
- Malware Development
Scripting & Automation
- DQ
- Regular Expression
- Shells
Tools
- Nmap
  - Nmap Options
  - What is Nmap
VCS
- What is VCS / Git / GitHub
- Git
- GitHub
  - GitHub Setup and Config
Virtualization
- Virtualization Fundamentals
Web Application Security
- HTTP Headers
  - Content Security Policy (CSP)
Windows
- Microsoft Management Console (MMC)
- Windows NT & MS-DOS
- Active Directory
  - AD Fundamentals
  - AD Attacks & Defense
    - AS-REProasting
    - Kerberoasting
  - AD Protocols
    - DNS in AD
    - Kerberos
    - LDAP
    - MSRPC
    - NTLM
  - AD Users
- File Systems
- Powershell
  - cmdlet
    - cmdlet (command-let)
    - cmdlet commands
      - Active Directory
        
        -Properties
        
        Get-ADGroup
        
        Get-ADUser
- Windows Event Logs
  - EventLog & Event Viewer
  - Get-WinEvent

RTOS (Real-Time Operating System)

A Real-Time Operating System (RTOS) is a specialized, lightweight operating system designed to manage embedded systems by executing tasks within strict, predetermined time constraints (deadlines).

Unlike general-purpose operating systems (Windows/Linux), an RTOS focuses on predictability and determinism, ensuring critical events are processed immediately or at exact times, rather than maximizing user throughput.

Some MCUs (like ESP32) can run:

FreeRTOS

FreeRTOS is a popular, open-source Real-Time Operating System (RTOS) kernel designed specifically for embedded devices and microcontrollers. It enables reliable, deterministic multitasking on resource-constrained hardware by managing task scheduling, timing, and communication, making it highly used in IoT, automotive, and industrial applications.