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OP, your link to http://regex101.com/ is broken. It's my go-to web-app too.

souriguhaon How to Crack Mifare Classic Cards

A pretty detailed presentation from Defcon. I believe these people were one of the firsts to tinker with Mifare in real life scenarios (IIRC this was back in 2008). http://tech.mit.edu/V128/N30/subway/Defcon_Presentation.pdf

souriguhaon I Am Sam Altman, President of Y Combinator. AMA

I've been closely following YC and the startup scene in SF. What's your advice to a startup, applying to YC this season, and is from a foreign country? I've read most your writings and watched few interviews as well. It'd be great if you have something to add! And thanks for the AMA!