Matthieu Keller's Posts

CTF NDH Qualifications

Logo NDH

This weekend (4 April 2015) take place the qualification round for "Nuit du Hack" CTF from 00:01 to 23:59. It was a Jeopardy CTF.

I have participated with the Zenk-Security team. At the end we got the 7th position and are qualified for the final which would be a Attack-Defense CTF in Paris in June.

I publish here the ones for the challenges I participated to and make a writeup of. All the writeup for this CTF are accessible here (in french).

First April SSTIC challenge

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The first of April is always the occasion for some great pranks. 2015 was a great year, as the CERN confirmed the existence of the Force, Google published a mirroring website and gentoo an old fashion one. In France we got a security event call SSTIC for which the tickets are very rare therefore the SSTIC challenge allows the ones with the flag to reserve a ticket. An April prank challenge was post yesterday.

Git, remove unwanted data from history

Recently I put unwanted data (a password) in one of my git commit. This commit was not push to an public server (like github or bitbucket) therefore there was no real security breach other than my git history.

The problem was to remove the data by rewriting the git history …

Blog changes

Short news from by blog:

Yesterday I publish my blog with a brand new theme. The main reason is to not have the classical bootstrap theme like everybody else. Nevertheless I am no graphic artist that is why I use a theme designed by someone else.

The theme is based …

Lost Windows password

Few weeks ago my girlfriend lost her laptop Windows password, I do not have any hint about it and of course I am not an other of it (otherwise mimicatz would have been my friend). I asked her to try basic password ("12345", "password"…) then she asked me to reset …