System and method for managing communication between contactless devices
AssigneesSTMicroelectronics Austria GmbH, Stmicroelectronics Razvoj Polprevodnikov D.O.O.
InventorsGustavo Jose Henriques Patricio, Anton Stem
Life of this patent
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Abstract
The disclosure relates to a modified NFC framing is used by a reader and selected devices during at least a part of the communication between the reader and the selected devices. The reader and the selected devices store modification rules for modifying the frames. Devices not storing those modification rules will discard the received modified frames.
Claims27
A method for managing a communication between a first contactless device and a second contactless device, the method comprising:
- exchanging, by the first and second contactless devices during the communication, frames having a frame format compliant with a contactless communication standard and comprising a start of frame field, an end of frame field, a payload field, and an error check field calculated from the payload field in compliance with the communication standard;
- storing modification rules in both contactless devices;
- modifying, by the first contactless device, in accordance with the modification rules, a content of at least one frame element of each frame of the at least a part of the communication so that the modified content of the at least one frame element is different from a reference content of the at least one frame element compliant with the communication standard, the at least one frame element including the start of frame field or the end of frame field or the payload field or the error check field,
- sending, by the first contactless device, the frames having the modified content to the second contactless device,
- receiving, by the second contactless device, the frames having the modified content;
- analyzing, by the second contactless device, the modified at least one frame element in accordance with the modification rules;
- and
- continuing, by the second contactless device, the communication in response to the second contactless device recognizing the modified at least one frame element.
A first contactless device, wherein the first contactless device and a second contactless device are configured to exchange, during a contactless communication, frames having a frame format compliant with a contactless communication standard and comprising a start of frame field, an end of frame field, a payload field, and an error check field calculated from the payload field in compliance with the communication standard, wherein the first contactless device comprises:
- a first storage medium configured to store modification rules;
- a first processor configured to:
- modify, in accordance with the modification rules, a content of at least one frame element of each frame of at least a part of the communication so that the modified content of the at least one frame element is different from a reference content of the at least one frame element compliant with the communication standard, the at least one frame element including the start of frame field, or the end of frame field, or the payload field, or the error check field;
- and
- a transmitter configured to send the frames having the modified content to the second contactless device.
A second contactless device, wherein the second contactless device and a first contactless device are configured to exchange, during a contactless communication, frames having a frame format compliant with a contactless communication standard and comprising a start of frame field, an end of frame field, a payload field, and an error check field calculated from the payload field in compliance with the communication standard, wherein the second contactless device comprises:
- a second storage medium configured to store modification rules;
- a receiver configured to receive modified frames from the first contactless device, wherein a content of at least one frame element of each frame of at least a part of the communication is modified, in accordance with the modification rules, so that the modified content of the at least one frame element is different from a reference content of the at least one frame element compliant with the communication standard, the at least one frame element including the start of frame field, or the end of frame field, or the payload field, or the error check field;
- and
- a second processor configured to:
- analyze, within each modified frame, the modified at least one frame element in accordance with the modification rules;
- and
- continue the communication in response to the modified at least one frame element being recognized.
Dependencies are inferred from the claim text.