README.md

Modal-Hack, introduction

This is my first course in cypersecurity. The course This course is

• My first C, review a pointer in C.
• Learning to read finding solutions myself via stackoverflow and read the standard reference

Tutorial 1 | programming in C

Pointer staff

Tutorial 2 | Network Programming in C

Learning the TCP/UDP protocol Implement wget with TCP socket a simple client-server with UDP socket.

Tutorial 3 | Concurrent Programming in C

Multi-thread programming. I implement two threads, one is for receiving the packets and the other for sending the packets.

Tutorial 4 | Sniffing and IP spoofing

Buffer overflow attack

Hacking the box by buffer overflow vulnerability of strcpy.

TCP SYN Flooding

Sending tons of TCP syn request to realise Deny-of-Service attack. It is simple but it illustrate well the Availability in CIA cybersecurity model.

DNS Hi-jacking

When a attacker realise a DNS hi-jacking, attacker spoofs the DNS request from user to DNS server and relies to the user a fake IP address to direct to a fake website. The attacker can receive some sensetive information like password by DNS hi-jacking.