A fast data transfer
collection system using message
authentication and contactless RF
proximity card technology in non-contact storage and retrieval applications. The
system is generally comprised of Host computers (application computer systems), Target
radio frequency (RF) terminals, and a plurality of portable Tags ("smart" or "proximity" cards). A Host provides specific application functionality to a Tag holder, with a high degree of protection from fraudulent use. A Target provides control of the RF antenna and resolves collisions between multiple Tags in the
RF field. A Tag provides reliable, high speed, and well authenticated secure exchanges of data / information with the Host resulting from the use of a custom ASIC design incorporating unique analog and digital circuits, nonvolatile memory, and
state logic. Each Tag engages in a transaction with the Target in which a sequence of message exchanges allow data to be read(written) from(to) the Tag. These exchanges establish the
RF communication link, resolve communication collisions with other Tags, authenticate both parties in the transaction, rapidly and robustly
relay information through the link, and ensure the integrity and incorruptibility of the transaction. The
system architecture provides capabilities to ensure the integrity of the data transferred thus eliminating the major problem of corrupting data on the card and in the
system. The architecture and protocol are designed to allow simple and efficient integration of the transaction
product system into data /
information processing installations.