Cybersecurity bootcamp: The Bridge

Cybersecurity: week 4

4 – 10 October 2021

What I’ve learned:

Basic on TCP/IP protocol. The OSI model. More deeply, we’ve seen some protocols from the Application layer (SMTP, POP, IMAP, SSH, RCP, DNS, FTP). We’ve started with crytography, hashes and public and private keys. Challenge this week was about stablishing a TCP connection with another VM.

Reading list:

  1. Chapter 1-2: Redes de computadoras. Un enfoque descendente. James F. Kurose. Download.

Group project:

  • We’ve worked on the SMTP protocol in the Application layer (with Alejandro Mora). To explain it, we’ve implemented a basic mail server using Postfix on Kali. After that, we’ve captured traffic (using wireshark) to explain SMTP commands (HELO/EHLO, 220 OK, 250-STARTTLS , RCPT, RSET, QUIT…) and some extensions. Our presentation.

What I’ve enjoyed:

The amount of tweets from people pretending to be an expert about BGP and DNS. It was fun for that to be on the news.

Some serious reading about BGP and facebook

Understanding How Facebook Disappeared from the Internet.

More details about the October 4 outage.

By Amanda Guglieri

#DigitalEditor at Editorial Reus.

#FullStackDev at Derecho Práctico.

Studying/Playing (currently):
– Computer Science at Universitat Oberta de Catalunya.
– Cibersecurity Bootcamp at The Bridge.