Category Archives: Misc

Backingup WordPress with UpdraftPlus

I had a couple of bad surprises with wordpress websites getting compromised because WordPress was not thouroughly updated.

Since, I looked for an easy WordPress backup solution, one that would take care of backing up not only posts, but plugins, pictures, etc. And ideally, that would be free.

UpdraftPlus has since saved my life more than once, not only from hackers, but also from erroneous configuration changes.

How to digitally sign your outgoing emails with Outlook ?

Would you like to prove to your contacts the authenticity of your emails ? A S/MIME signature of your messages may be a solution. It will guarantee that a message comes from you, and that its content wasn’t altered. You can do it for free – as long as it’s for a personnal use – using a Comodo free email certificate. The solution may be seducing, but there are two caveats.

First, the validation of your signature is done by your recipient email client, and most email clients just don’t support it. As a rule of thumb, consider only the outlook desktop app supports it (gmail,, default android client don’t support it, iphone can support it but it’s disabled by default). And there’s nothing you can do about it.

Second, the procedure to sign your messages may give some headaches, and it’ll be different for each email client. But at least, here is a step by step guide to digitally sign outgoing messages on Outlook.

  1. Get a mail Certificate
  2. Install your mail certificate in your local certificate store
  3. Check that your certificate is properly installed
  4. Configure Outlook to sign outgoing messages

1. Get a mail certificate

If you don’t already own a mail certificate, you can get a free one from Comodo here, or directly here.
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Exemple d’une transaction sans contact MasterCard PayPass

Pour comprendre les mécanismes EMV, il est toujours intéressant d’avoir des exemples d’APDU et de dialogues. Ci-dessous, un exemple d’une transaction EMV sans contact réussie (achat sans-contact MasterCard PayPass). Inutile de récupérer les infos de la carte, c’est une carte de test invalide dans le monde réel 🙂 PCD identifie les commandes du terminal, PICC les réponses de la carte MasterCard :
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