Impact of the different Wifi security modes
Comparing the different Wifi/WPA authentication and key distribution methods (PSK, EAP, SEA).
Introduction to TLS v1.3
Some notes about how TLS v1.3 works. This is a follow-up of the previous episode about TLS v1.2. As before, the goal is to have a high-level overview about how the protocol works, what is the role of the different messages and be able to understand (and debug) a network traffic dump.
Introduction to TLS v1.2
Some notes about how TLS v1.2 (Transport Layer Security) works. The goal explain what is going on in a network traffic dump, the role of the different TLS extensions, the impact of the different cipher suites on security, etc. It includes several diagrams and many references.
Introduction to the Diffie-Hellman key exchange
The Diffie-Hellman (DH) key exchange (and variants thereof) is widely used in many protocols (such as TLS, SSH, IKE (IPSec), Signal, etc.) to bootstrap some symmetric key material which may then be used to secure communication channel between two parties. This introduction focuses on the different ways the DH key exchange is used in practice in several protocols (especially TLS) and the impact of these different approaches on the security. This is intended as a prelude for the upcoming next episodes about how TLS works.
TUN/TAP interface (on Linux)
Some notes about using the TUN/TAP interface, especially on Linux.
Introduction to UPnP
This post gives simple explanations of how UPnP (Universal Plug-and-Play) works, especially with the goal of testing the security devices such as routers, smart TVs, etc.
GNU/Linux host name resolution
This post describes different software components involved in host name resolutions and DNS configuration on GNU/Linux systems. It consists of a diagram and some accompanying explanations. The goal is to give some pointers and references to understand how to troubleshoot host name/DNS resolution problems and configuration problems on GNU/Linux systems.
Using dig as a LLMNR or mDNS CLI Lookup utility
I was looking for a LLMNR commandline lookup utility. Actually, dig can do the job quite fine.
Foo over SSH
Using SSH as a transport for your protocol
A comparison of the different solutions for using SSH2 as a secured transport for protocols/services/applications.
OpenSSH ProxyUseFdPass
While looking at the OpenSSH ssh_config manpage, I found the ProxyUseFdpass configuration I did not know about. It is apparently not widely known or used.
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