Abstract: Described herein are methods and systems for providing identity, authentication, and access control services in a mobile environment utilizing data encoded tags. A server computing device receives tag data and user data from a mobile device, the tag data read from a data-encoded tag in proximity to the mobile device using a short-range communication protocol, and the user data stored on the mobile device. The server computing device authenticates a user of the mobile device based on the user data, determines whether the user is authorized to access an access point associated with the data-encoded tag, transmits a message to the access point that instructs the access point to grant user access if the user is authorized, receives a response from the access point indicating that user access is granted and transmits a message to the mobile device indicating to the user that access is granted to the access point.

Abstract: Described herein is a radio-frequency identification (RFID) credential configured to provide a plurality of message formats. The RFID credential includes a low-frequency proximity chip. The proximity chip includes a controller having a protocol sequencing module, an analog front end, a modes register, and a modulator. The protocol sequencing module is programmed to deliver messages associated with the plurality of message formats to the analog front end using the modes register and the modulator, the delivery of the messages occurring in a sequential manner based on the message format of the message. The modes register is configured to store a plurality of message formats, and one or more bits in each message format identify the message format type.