C.I.E – Carta di Identità Elettronica Functional Specification Version 2.0

8. Answer To Reset (ATR)The Answer To Reset byte string returns information about the communication protocol, the cardand application type, the life cycle status, etc. and is the first step in the PPS protocol.While some of the bytes are defined by ISO, as they are used by the communication protocol, thereis the possibility to define the value of other bytes, called Historical Bytes. Please refer to [1] for themeaning of the single ATR characters.To avoid possible interoperability problems, only the historical bytes are mandated, while the value(and, if applicable, the presence) of all the interface characters is not fixed in this specification.Nevertheless, Initial Character, Format Character and Interface Characters are to be interpreted asindicated in [1], to allow a correct parsing of the byte string.The Historical Bytes are in proprietary format, and convey information about the application. Allapplication parameters (eg. card profile, etc) are defined in this specification, and are thereforeimplicitly known, and do not need to be given in the ATR.H8-H13 of historical bytes are used to represent the string “ITID” followed by the APDUspecification version (1 byte) and the File System Specification version (1 byte).CIE - Functional Specification v 2.0 -Page 17/76