John Opdenakker

Welcome to my personal Infosec blog.

Aug 23, 2020

The data breach reflex

The data breach reflex

This post was originally posted on Peerlyst on October 6, 2017. I edited it a little bit and added some links to more recent blogposts. Another day another data breach. Whether we like

May 13, 2020

Security awareness quiz questions

Security awareness quiz questions

Ashar Javed had an interesting idea to create security awareness quiz questions and asked me if I wanted to cooperate. The idea is to make this a community effort and make these questions

Apr 14, 2020

Encoding != Encryption != Hashing

Encoding != Encryption != Hashing

This is a very quick and highly simplified explanation about encoding, encryption and hashing and how they are different. Today I tweeted this: encoding != encryption != hashing You can decode, decrypt but there'

Mar 31, 2020

My favorite security quotes

My favorite security quotes

I love good security quotes, aphorisms and statements because they often hold a lot of truth and wisdom. That's why I decided to bundle the ones I like in a blog. I can't

Jan 13, 2020

SMS based 2FA is better than no 2FA

SMS based 2FA is better than no 2FA

Two layers of defense are better than one layer of defense. This seems logic. But every now and then I end up in a discussion - mainly on Twitter - where people tell