Do you want to know how Smart Cards can help you improve security and work efficiently? Smart cards are among us for decades, but they are still not widely used on daily basis by most of us, even though they provide significant advantages for both security and usability and all the tools are open source in Linux. Smart cards are no longer only credit-card sized cards, but also more practical USB dongles which are frequently combined with other features such as OTP or U2F, which can take this even further. I will go through architecture of smart cards and show you how they can be used to simplify your work.