Richard Ulfvin

3 minute read

Advanced Encryption Standard (or for short AES, also known as Rijndael) is a powerful symmetric block cypher approved by NIST. It uses 128-bit blocks and keys at the size of 128, 192 and 256 bits. AES uses a transformation schema, where it first using a substitution table, then shifts data rows, then mixes columns to finally do a simple XOR operation on each column using different parts of the encryption key. The longer the key is, the more rounds it need to operate on. So, for a 128-bit key…

Parsing Windows Firewall Logs

Mega Geek Week presentation

Richard Ulfvin

3 minute read

Last night me and my coworker Jonas was invited to do and evening presenting at the Mega Geek Week venue in Stockholm. The topic was on how to handle the Windows Firewall and some helpful tips and tricks to help you figure out how the network communication was setup between windows systems.

The new blog is up

Selecting a solution to run this blog

Richard Ulfvin

4 minute read

So, I finally stated a new blog to share my adventures in code and other related topics. It wasn’t a simple task to select a blogging engine.