PC/SC (Personal Computer / Smart Card) is an interoperability standard ensuring the dialogue between computers and smart cards. This standard is available in most of the operating system, including Windows and Linux. Personal computer/Smart card (or PC/SC) is at the same time a specification and a software library for the access to smartcards under Microsoft Windows. A free implementation of the PC/SC, called PC/SC Lite, is available under GNU/Linux and distributed with Mac OS X. The specification of this library is done by the PC/SC Workgroup, composed of smartcard and computer manufacturer. Its goal is to ensure a standard base of orders to allow a better interoperability between PC, card readers and smartcards.