Why is EMV card returning error code 6985 to GET PROCESSING OPTIONS command ?

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When communicating with an EMV chip card, the card may reply to a command with error code SW1 SW2 = ’69 85′. In this post, we’ll analyze why this error code may be returned in response to the GET PROCESSING OPTIONS (GPO) command.

The GPO command « initiates the transaction within the ICC« , as defined in EMV 4.3 book 3, section ‘6.5.8 GET PROCESSING OPTIONS Command-Response APDUs‘. Status word ‘6985’ is defined as « Command not allowed » (« conditions of use not satisfied »), in EMV 4.3 book 3, section ‘6.3.5 Coding of the Status Bytes. This often happens when the GPO command contains an invalid response to the card Processing Data Options List (PDOL). Continuer la lecture →

Why you should give a try to the Pomodoro time management technique

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I’ve first heard from the Pomodoro technique a couple of years ago from a friend at work. You can find details on the official website, but in short : it’s a focusing technique where you work in short intervals (25 minutes), separated by 5 minutes breaks. A timer is used to « wake you up » when your interval is finished. The idea is that focused period of work (with no interruption), separated by short break improves mental agility, increases productivity, prevents burnout, will end starvation in the world, solve the middle east conflicts, etc. Continuer la lecture →