Choosing the correct tool for the job -- Implants and Desires

[Pilgrimsmaster]

To add to what the others have said, The product page has some great info and video links etc

https://dangerousthings.com/product/flexm1/

Also
this thread which expands further on the above if you want more info

"magic" Mifare chips

The Mifare “classic” S50 1k chip? For many years the Mifare MF1ICS50 1k chip was used for all kinds of applications as a “secure chip” for everything from access control to stored value cards, and used for making localized payments within closed systems like public transit and laundry services. However, it uses a security mechanism called “crypto1” which is a simple, proprietary encryption mechanism that hardly has anything to do with modern cryptography. It has been broken for many years now, b…