A full dump is just 1024 bytes of hex — until you know how to read it. Using a real public-transport card, here’s how to go from raw sectors to the MAD, an NDEF message, a digital signature, and the access bits that decide what you can touch.
Tag: security
While cleaning up I found a stack of old chipcards and got curious. Here’s the full, honest log of getting a Proxmark3 built, flashed, and reading/writing Mifare Classic cards — segfaults, all-zero dumps, and every gotcha in between.
Once you start to use fail2ban on more than one machine you’ll get to the point where you’d like to apply the IP blocking to machines other than the local one. While there are other (partially commercial) solutions to do that, I still decided to go with fail2ban. Please consider the following description as a […]