📖
Notes
  • 🙌Welcome!
  • CyberSecurity
    • Penetration Testing
      • ELearnSecurity
        • eJPT
          • Footprinting & Scanning
            • Port Scanning
            • Mapping Networks
          • Information Gathering
            • Subdomain Enumeration
          • Network Attacks
            • Arp Poisoning
            • Null Sessions
            • Windows Shares
            • Authentication Cracking
          • Networking
            • Python Server to Receive Exfiltrated Data
            • CLI Tool to interact with HTTP/HTTPS
          • Programming
            • C++ Keylogger
            • C++ Information Stealer
          • System Attacks
            • Pivoting
            • Backdoor
          • Vulnerability Assessment
          • Web Attacks
            • SQL Injection
            • HTTP Verbs
            • Web Server Fingerprinting
      • PortSwigger
        • Cross-origin resource sharing (CORS)
          • Access-Control-Allow-Origin response header
          • Vulnerabilities arising from Misconfigurations
            • Server-generated ACAO header from client-specified Origin header
            • Errors parsing Origin headers
            • Whitelisted null origin value
            • Exploiting XSS via CORS trust relationships
            • Breaking TLS with poorly configured CORS
            • Intranets and CORS without credentials
            • Mitigations
        • Sql Injection
          • Examining the database
          • Retrieving data from other database tables
          • Blind SQL injection
          • Mitigation
      • TryHackMe
        • Main Methodology
          • 1. Reconnaissance
            • Google Dorking
            • Metadata Reader/Writer
            • Steghide - Stegnography
            • OSINT Framework
          • 2. Enumeration/Scanning
            • NFS Enumeration Tools
            • NMAP - Port Scanning
            • Web Enumeration Tools
            • SMB Enumeration Tools
            • SMTP Enumeration Tools
            • Shodan - IOT Search Engine
            • FTP Enumeration Tools
            • Wordpress Enumeration Tools
            • OWASP ZAP - WebApp Testing
            • BurpSuite - WebApp Testing
            • MySQL Enumeration Tools
            • Wordlists
          • 3. Gaining Access / Exploitation
            • Buffer Overflow
              • 1. Immunity Debugger
              • 2. Mona Setup
              • 3. Spiking
              • 4. Fuzzing
              • 5. Crash Replication & Controlling EIP
              • 6. Finding Bad Characters
              • 7. Find a Jump Point
              • 8. Generate Payload
              • 9. Prepend NOPs
              • 10. Final Buffer
            • Cryptography
              • Hash Crack Tools
              • Online Password Cracking Tools
              • Encryption
              • John the Ripper
            • Evasion Techniques
            • Shells
              • Powershell
              • Msfvenom
              • Meterpreter
              • Metasploit -- multi/handler
              • Netcat
              • Socat
            • Web Applications
              • OWASP Top 10
              • File Upload Vulnerabilities
              • Authentication Vulnerability
              • XML External Entity (XXE)
              • Cross-Site Scripting (XSS)
              • ZTH: Obscure Web Vulns
              • Server Side Request Forgery (SSRF)
              • Insecure Direct Object Reference (IDOR)
              • ZTH : Continued
              • File Inclusion Vulnerability
                • Local File Inclusion (LFI)
                • Log Poisoning Attack (LFI to RCE via Log files)
            • Windows Applications
              • Jenkins
              • Windows Active Directory
                • Impacket's secretsdump.py
                • Kerberos
                  • Enumerating Users with Kerbrute
                  • Enumerating SPN Accounts with Powershell
                  • Get SPN Account Ticket with Invoke-Kerberoast
                  • Kerberoasting with Rubeus & Impacket
                  • AS-REP Roasting with Rubeus/GetNPUsers.py
                  • Pass the Ticket with mimikatz
                  • Golden/Silver Ticket Attacks with mimikatz
                  • Kerberos Backdoors with mimikatz
                  • Harvesting and Brute-Forcing with Rubeus
                  • Conclusion and Resources
          • 4. Post Exploitation
            • Privilege Escalation
              • Linux
                • 1. Introduction
                • 2. Scripts
                • 3. Kernel Exploits
                • 4. Service Exploits
                • 5. Weak File Permissions
                • 6. Sudo
                • 7. Cron jobs
                • 8. SUID/SGID Executable
                • 9. CAP_SETUID Capabilities Executable
                • 10. Passwords & Keys
                • 11. NFS
                • PrivEsc CTF Checklists
              • Windows
                • Token Impersonation
                • PrivEsc CTF Checklists
                • Permission
                • Scripts
                • Unquoted Service Path
            • Tools
              • Meterpreter Modules
              • Impacket's Psexec
              • Impacket's mssqlclient.py
              • Firefox Decryptor
              • Socat - Reverse TCP Tunnel
            • Windows Active Directory
              • Enumeration with Powerview
              • Enumeration with Bloodhound (GUI)
              • Dumping Hashes with mimikatz
              • Golden Ticket Attacks with mimikatz
              • Enumeration with Server Manager
              • Maintaining Access
              • Additional Resources
          • 5. Covering Tracks
          • 6. Reporting
        • Networking Concepts
          • SSH Reverse Tunnels
        • Scripting
          • Curl
          • Powershell
            • Basic Powershell Commands
            • Enumeration
        • Web Extensions
          • Shodan
          • Wappalyzer
      • Miscellaneous
        • SMTP Enumeration
        • Nmap Advanced Scanning
        • Persistence via Meterpreter
        • DNS Enumeration
        • NetBIOS & SMB
        • DHCP Starvation
        • Packet Manipulation
        • Hash Cracking
        • MITM
        • Msfvenom Payload in APK (Manual Embedding)
    • Blue Teaming
      • Digital Forensics & Incidence Response
        • Memory Acquisition with LIME
        • Disk Analysis with Autopsy
        • Data and Memory Collection with FireEye Redline
        • Memory Forensice with Volatility
      • Intrusion Detection
        • Intrusion Detection Systems (IDS)
        • Threat Monitoring with Security Information & Event Management (SIEM)
        • Security Event Monitoring
        • Host Based Intrusion Detection System (HIDS) - OSSEC
      • Miscellaneous
        • Docker Image Security Analysis with Trivy
  • DevOps
    • Infrastructure as a Code (IaC)
      • Ansible
        • 1. Playbooks
        • 2. Modules
        • 3. Inventory
        • 4. Roles
        • 5. Ansible Tower
      • Terraform
        • 1. Overview
        • 2. Modify Resources
        • 3. Delete Resources
        • 4. Reference Resources
        • 5. Terraform Files
        • 6. Terraform State Commands
        • 7. Terraform Output
        • 8. Target Resources
        • 9. Terraform Variables
        • 10. Expressions + Functions
        • 11. Meta-Arguments
        • 12. Modules
        • 13. Managing Multiple Environments
        • 14. Testing Terraform Code
        • 15. Final Thoughts
    • Orchestration
      • Kubernetes
        • 1. Main K8s Components
        • 2. K8s Architecture
        • 3. Minikube & Kubectl
        • 4. YAML Configuration File
        • 5. K8s Namespaces
        • 6. K8s Ingress
        • 7. Helm - Package Manager of K8s
        • 8. K8 Volumes
        • 9. K8 StatefulSet
        • 10. K8 Services
  • Development
    • Blockchain
      • FreeCodeCamp Course
        • 1. Introduction
        • 2. Solidity Basics
        • 3. Storage Factory
        • 4. Fund Me
        • 5. Ethers.js
        • 6. Hardhat
        • 7. Hardhat | Fund Me
        • 8. Contract Lottery | Raffle
        • 9. IPFS
        • 10. ERC20s
        • 11. DeFi & Aave
        • 12. NFTs | Encoding
        • 13. Reentrancy Attack
    • Backend
      • NodeJs
        • Introduction
        • Additional Concepts
        • ExpressJs
    • Database
      • SQL
        • Basics
          • 1. Querying Data
          • 2. Filtering Data
          • 3. Joining Multiple Tables
          • 4. Grouping Data
          • 5. Set Operations
          • 6. Grouping Sets, Cube, and Rollup
          • 7. Subquery
          • 8. Common Table Expressions
          • 9. Modifying Data
          • 10. Transactions
          • 11. Import & Export Data
          • 12. Managing Tables
    • Testing
      • Test Driven Development (TDD)
      • Jest js
      • Cypress js
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On this page
  • The Oracle Problem
  • Smart Contracts
  • Chainlink
  • Versions of Web
  • Basic Terminologies
  1. Development
  2. Blockchain
  3. FreeCodeCamp Course

1. Introduction

The Oracle Problem

  • Blockchains can't interact with real world data and events

Oracles

  • Any device that interacts with off chain world to provide external data or computation to smart contracts

  • We need decentralized oracle network

Smart Contracts

An agreement, contract or set of instructions that is deployed on a decentralized blockchain.

A smart contract is

  • Cannot be altered (immutable)

  • Automatically executes

  • Everyone sees terms of agreement

Hybrid Smart Contracts

  • Combining off chain decentralized logic with off chain decentralized data and decentralized computation gives rise to hybrid smart contracts

Chainlink

  • It is a decentralized oracle network

Versions of Web

Web1

The permissionless open sourced web with static content

Web2

The permissioned web, with dynamic content. Where companies run your agreements on their servers

Web3

The permissionless web with dynamic content. Where decentralized censorship resistant networks run your agreement and code.

Basic Terminologies

DeFi

  • Stands for Decentralized Finance

DAOs

  • Stands for Decentralized Autonomous Organizations

NFTs

  • Stands for Non Fungible Tokens

Consensus

  • Mechanism used to agree on state of blockchain

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Last updated 1 year ago