Skip to content

Category Archives: Life (the real one)

I like to learn new things. I also like to understand complex concepts. Here is one topic that I know I’ll never understand fully. Hence my interest to it !

Attaque mathématique des codes Bixi (vélo libre-service)

Wednesday, June 17, 2009

J’étais au centre ville aujourd’hui et j’avais affaire pas très loin. Au lieu d’utiliser le métro, j’ai loué un Bixi, vélo en libre service. J’ai été surpris de constater que les codes Bixi ne comporte que 3 chiffres, sur 5 caractères, soit 3^5=243 codes possibles.
Ça semble bien peu, mais si les codes ne sont utilisables [...]

Also filed in En français, Math | | Comments (5)

High availability for humans

Friday, July 11, 2008

I noticed a new link in my GMail account (I am using gmail for your domain), showing the sessions used to connect to an account and the last time since it had activity on that session.
Pretty neat, although I doubt a regular user will be able to make sense of any of that… In my [...]

Also filed in | | Comments (1)

Gathering entropy from children

Sunday, January 13, 2008

Here is a trick I found that solved an old problem: How can coin flipping ever be fair if only one person chooses head or tail ?
I remember Chrissy complaining about that to Jack in an episode of “Three’s Company”. Above the humour, I remember thinking about fair coin flipping back then, many years before [...]

Also filed in Cryptography | | Comments Off

My name is Guillaume, and I want to be a hacker

Wednesday, January 9, 2008

I was reading the FAQ on how to be a hacker, from Eric Raymond. I recognized in me many of the hacker traits – maybe even some of the skills. But I use a handle, ixe013.
One thing for sure, I love to solve problems and build things. When I started this web site, I pondered [...]

Also filed in | | Comments (1)