security

What is web scraping, how can you defend from it, and how do scrapers circumvent these defences?

• cloud

What a VPN is for, why a commercial VPN rarely makes you more secure or anonymous, and which VPN protocols to use or avoid.

• networking
• cloud

SELinux basics: how the security module adds checks after normal permissions, and the commands to read, change and restore file contexts.

• linux

Setting up AIDE to track file integrity on Debian and Arch Linux: configuration, the initial database, checks and updates, and where it falls short.

• linux

How AES works in ECB and CBC modes, and how flipping bits in one ciphertext block lets you change the next decrypted block.

Controlling what websites people see with a MITM attack using ARP spoofing.

• networking

Basic use of GPG for importing and exporting keys, including what to do when you encounter verification issues due to unknown keys.

• linux

Instructions on how to set up SSH key authorization properly, including generating keys and server configuration.

• linux