CN111654352A - Shielded radio frequency communication method and device - Google Patents
Shielded radio frequency communication method and device Download PDFInfo
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- CN111654352A CN111654352A CN202010464562.7A CN202010464562A CN111654352A CN 111654352 A CN111654352 A CN 111654352A CN 202010464562 A CN202010464562 A CN 202010464562A CN 111654352 A CN111654352 A CN 111654352A
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- radio frequency
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- 238000004891 communication Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
- H04K3/25—Countermeasures against jamming based on characteristics of target signal or of transmission, e.g. using direct sequence spread spectrum or fast frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K2203/00—Jamming of communication; Countermeasures
- H04K2203/10—Jamming or countermeasure used for a particular application
- H04K2203/20—Jamming or countermeasure used for a particular application for contactless carriers, e.g. RFID carriers
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Abstract
The invention discloses a method and a device for shielding radio frequency communication, and belongs to the technical field of radio frequency. The method and the device for shielding radio frequency communication can actively send the interference signal with the preset format so as to shield normal near field communication, thereby effectively improving the effect of shielding the near field communication; the invention can also identify the reading instruction of the card reader so as to generate the interference signal corresponding to the protocol type of the reading instruction, thereby improving the effectiveness of the interference signal.
Description
Technical Field
The present invention relates to the field of radio frequency technologies, and in particular, to a method and an apparatus for shielding radio frequency communication.
Background
With the popularization of Near Field Communication (NFC) technology in intelligent terminals (mobile phones, tablets, notebooks, etc.), various related application products are promoted. One typical application is a near field payment function based on Radio Frequency Identification (RFID) communication, and a consumer can use a contactless bank card to perform payment near a POS machine. However, the operation is convenient for users, meanwhile, potential safety hazards are brought, and lawbreakers can finish the operation of embezzlement through the bank card close to the users under the condition that the users are unaware.
To solve this problem, solutions are continuously available in the market, which mainly use coils (or circuits built up by discrete devices) to change the frequency of the high-frequency card or to generate random interference signals that modulate the spatial carrier. However, the interference effect of the approximate white noise is generated, and the interference effect is poor for the RFID having the codec communication function.
Disclosure of Invention
In view of the above problems, a method and an apparatus for shielding radio frequency communication are provided to improve interference effect.
The invention provides a shielding radio frequency communication method, which is applied to a radio frequency chip and comprises the following steps:
s11, monitoring whether the radio frequency chip is in a near field environment, and if so, executing a step S12; if not, returning to the step S11;
and S12, sending the interference signal by adopting a preset format.
Preferably, the preset format is an interference signal generated by adopting a manchester code OOK encoding mode of an ISO14443 protocol, or
The preset format is an interference signal generated by adopting an NRZ code BPSK coding mode of ISO14443TypeB, or
Interference signals generated by Manchester code single carrier coding method of ISO15693, or
Interference signals generated by Manchester code double-carrier coding method of ISO15693, or
The preset format is an interference signal generated by adopting an ISO14443 protocol and an ISO15693 protocol in an alternating mode.
The invention also provides a shielding radio frequency communication method, which is applied to a radio frequency chip and comprises the following steps:
s21, collecting a reading instruction of the card reader;
s22, identifying the reading instruction and acquiring the protocol type of the reading instruction;
and S23, generating an interference signal corresponding to the protocol type according to the protocol type.
Preferably, the protocol types include ISO14443 protocol and ISO15693 protocol.
Preferably, the format of the interference signal corresponding to the ISO14443 protocol is an interference signal generated by a manchester code OOK encoding method of the ISO14443 protocol, or an interference signal generated by an NRZ code BPSK encoding method of the ISO14443 TypeB.
Preferably, the format of the interference signal corresponding to the ISO15693 protocol is an interference signal generated by a manchester code single-carrier or double-carrier coding method of ISO 15693.
The invention also provides a shielding radio frequency communication device, which is applied to a radio frequency chip and comprises:
the monitoring unit is used for monitoring whether the radio frequency chip is in a near-field environment;
and the processing unit is used for sending an interference signal by adopting a preset format when the radio frequency chip is in the near field environment.
The invention also provides a shielding radio frequency communication device, which is applied to a radio frequency chip and comprises:
the acquisition unit is used for acquiring a reading instruction of the card reader;
the identification unit is used for identifying the reading instruction and acquiring the protocol type of the reading instruction;
and the generating unit is used for generating an interference signal corresponding to the protocol type according to the protocol type.
The beneficial effects of the above technical scheme are that:
in the technical scheme, the method and the device for shielding radio frequency communication can actively send the interference signal in the preset format so as to shield normal near field communication, thereby effectively improving the effect of shielding the near field communication; the invention can also identify the reading instruction of the card reader so as to generate the interference signal corresponding to the protocol type of the reading instruction, thereby improving the effectiveness of the interference signal.
Drawings
FIG. 1 is a flow chart of one embodiment of a method of shielding radio frequency communications in accordance with the present invention;
FIG. 2 is a flow chart of another embodiment of a method of shielding radio frequency communications in accordance with the present invention;
FIG. 3 is a block diagram of one embodiment of a shielded radio frequency communication device according to the present invention;
fig. 4 is a block diagram of another embodiment of a shielded radio frequency communication device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
As shown in fig. 1, the present embodiment provides a method for shielding radio frequency communication, which is applied to a radio frequency chip, and includes:
s11, monitoring whether the radio frequency chip is in a near field environment, and if so, executing a step S12; if not, returning to the step S11;
and S12, sending the interference signal by adopting a preset format.
The preset format is an interference signal generated by adopting a Manchester code OOK coding mode of an ISO14443 protocol, or the preset format is an interference signal generated by adopting an NRZ code BPSK coding mode of an ISO14443TypeB, or an interference signal generated by adopting a Manchester code single carrier coding mode of an ISO15693, or an interference signal generated by adopting a Manchester code double carrier coding mode of an ISO15693, or the preset format is an interference signal generated by adopting an alternative mode of an ISO14443 protocol and an ISO15693 protocol.
By way of example and not limitation, the baseband interference signal of the rf chip may be classified into the following types according to different operating modes:
a: full 0 data. 00000000. cndot. cndot.;
b: full 1. data. 11111111. cndot.;
c: 01. alternating data 01010101. cndot.;
d: a random sequence 01011101. cndot.;
the baseband interference signal is modulated on a carrier RF antenna, and the baseband modulation scheme may be divided into a manchester code OOK coding scheme of ISO14443 protocol, an NRZ code BPSK coding scheme of ISO14443TypeB, a manchester code single carrier coding scheme of ISO15693, a manchester code double carrier coding scheme of ISO15693, a low-speed/high-speed mode, and the like according to different protocols.
In this embodiment, the method for shielding radio frequency communication can actively send the interference signal in the preset format to shield normal near field communication, effectively improve the effect of shielding near field communication, and effectively interfere the communication of a reader-writer of a stolen bank card, so that the reader-writer cannot distinguish real card return data, and the effect of shielding communication is achieved.
The same chip technology is used as that of a common high-frequency card, and the subsequent card making process can be completely compatible with the existing card making process, so that the two problems can be effectively solved, the production cost is reduced, and the protection effect is improved.
As shown in fig. 2, the present embodiment provides a method for shielding radio frequency communication, which is applied to a radio frequency chip, and includes:
s21, collecting a reading instruction of the card reader;
s22, identifying the reading instruction and acquiring the protocol type of the reading instruction;
wherein the protocol types include an ISO14443 protocol and an ISO15693 protocol.
And S23, generating an interference signal corresponding to the protocol type according to the protocol type.
Furthermore, the format of the interference signal corresponding to the ISO14443 protocol is an interference signal generated by a manchester code OOK encoding mode of the ISO14443 protocol, or an interference signal generated by an NRZ code BPSK encoding mode of the ISO14443 TypeB;
furthermore, the format of the interference signal corresponding to the ISO15693 protocol is an interference signal generated by a manchester code single-carrier or double-carrier coding method of ISO 15693.
In the embodiment, the shielding radio frequency communication method can identify the reading instruction of the card reader so as to generate the interference signal corresponding to the protocol type of the reading instruction, thereby improving the effectiveness of the interference signal. The shielding radio frequency communication method realizes that the radio frequency chip does not actively send data after entering the field, and sends the interference signal of the interference card corresponding to the protocol after receiving the reading instruction sent by the reader-writer, thereby effectively interfering the communication of the bank card reader-writer which is stolen, leading the reader-writer to be incapable of distinguishing the real card return data and achieving the effect of shielding the communication.
As shown in fig. 3, the present embodiment provides a shielding rf communication device, applied in an rf chip, including:
the monitoring unit 31 is configured to monitor whether the radio frequency chip is in a near-field environment;
and the processing unit 32, when the radio frequency chip is in the near field environment, the processing unit 32 is configured to send an interference signal in a preset format.
The preset format is an interference signal generated by adopting a Manchester code OOK coding mode of an ISO14443 protocol, or the preset format is an interference signal generated by adopting an NRZ code BPSK coding mode of an ISO14443TypeB, or an interference signal generated by adopting a Manchester code single carrier coding mode of an ISO15693, or an interference signal generated by adopting a Manchester code double carrier coding mode of an ISO15693, or the preset format is an interference signal generated by adopting an alternative mode of an ISO14443 protocol and an ISO15693 protocol.
In this embodiment, the shielding radio frequency communication device can actively send the interference signal in the preset format to shield normal near field communication, so that the effect of shielding near field communication is effectively improved, communication of stealing a bank card reader-writer can be effectively interfered, the reader-writer cannot distinguish real card return data, and the effect of shielding communication is achieved. The shielding radio frequency communication device and a common high-frequency card use the same chip technology, and the subsequent card making process can be completely compatible with the existing card making process, so that the two problems can be effectively solved, the production cost is reduced, and the protection effect is improved.
As shown in fig. 4, the present embodiment provides a shielded radio frequency communication device, which is applied in a radio frequency chip, and includes:
the acquisition unit 41 is used for acquiring a reading instruction of the card reader;
an identifying unit 42, configured to identify the read instruction and obtain a protocol type of the read instruction;
wherein the protocol types include an ISO14443 protocol and an ISO15693 protocol.
A generating unit 43, configured to generate an interference signal corresponding to the protocol type according to the protocol type.
Furthermore, the format of the interference signal corresponding to the ISO14443 protocol is an interference signal generated by a manchester code OOK encoding mode of the ISO14443 protocol, or an interference signal generated by an NRZ code BPSK encoding mode of the ISO14443 TypeB;
furthermore, the format of the interference signal corresponding to the ISO15693 protocol is an interference signal generated by a manchester code single-carrier or double-carrier coding method of ISO 15693.
In the embodiment, the shielding radio frequency communication device can identify the reading instruction of the card reader so as to generate the interference signal corresponding to the protocol type of the reading instruction, thereby improving the effectiveness of the interference signal. The shielding radio frequency communication device realizes that the radio frequency chip does not actively send data after entering the field, and sends an interference signal of an interference card corresponding to a protocol after receiving a reading instruction sent by the reader-writer, so that the communication of a bank card reader-writer stolen can be effectively interfered, the reader-writer can not distinguish real card return data, and the effect of shielding communication is achieved. The shielding radio frequency communication device and a common high-frequency card use the same chip technology, and the subsequent card making process can be completely compatible with the existing card making process, so that the two problems can be effectively solved, the production cost is reduced, and the protection effect is improved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A shielding radio frequency communication method is applied to a radio frequency chip and is characterized by comprising the following steps:
s11, monitoring whether the radio frequency chip is in a near field environment, and if so, executing a step S12; if not, returning to the step S11;
and S12, sending the interference signal by adopting a preset format.
2. The shielded radio frequency communication method according to claim 1, wherein the predetermined format is an interference signal generated by a manchester code OOK encoding method of ISO14443 protocol, or
The preset format is an interference signal generated by adopting an NRZ code BPSK coding mode of ISO14443TypeB, or
Interference signals generated by Manchester code single carrier coding method of ISO15693, or
Interference signals generated by Manchester code double-carrier coding method of ISO15693, or
The preset format is an interference signal generated by adopting an ISO14443 protocol and an ISO15693 protocol in an alternating mode.
3. A shielding radio frequency communication method is applied to a radio frequency chip and is characterized by comprising the following steps:
s21, collecting a reading instruction of the card reader;
s22, identifying the reading instruction and acquiring the protocol type of the reading instruction;
and S23, generating an interference signal corresponding to the protocol type according to the protocol type.
4. The shielded radio frequency communication method of claim 3, wherein the protocol types include ISO14443 and ISO15693 protocols.
5. The shielded radio frequency communication method of claim 4, wherein the format of the interference signal corresponding to the ISO14443 protocol is an interference signal generated by a Manchester code OOK encoding method of the ISO14443 protocol or an interference signal generated by an NRZ code BPSK encoding method of the ISO14443 TypeB.
6. The shielding radio frequency communication method according to claim 4, wherein the format of the interference signal corresponding to the ISO15693 protocol is an interference signal generated by a Manchester code single-carrier or double-carrier coding method of ISO 15693.
7. A shielded radio frequency communication device applied to a radio frequency chip, comprising:
the monitoring unit is used for monitoring whether the radio frequency chip is in a near-field environment;
and the processing unit is used for sending an interference signal by adopting a preset format when the radio frequency chip is in the near field environment.
8. A shielded radio frequency communication device applied to a radio frequency chip, comprising:
the acquisition unit is used for acquiring a reading instruction of the card reader;
the identification unit is used for identifying the reading instruction and acquiring the protocol type of the reading instruction;
and the generating unit is used for generating an interference signal corresponding to the protocol type according to the protocol type.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010464562.7A CN111654352A (en) | 2020-05-28 | 2020-05-28 | Shielded radio frequency communication method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010464562.7A CN111654352A (en) | 2020-05-28 | 2020-05-28 | Shielded radio frequency communication method and device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2007048399A1 (en) * | 2005-10-26 | 2007-05-03 | Acg Identification Technologies Gesellschaft Mbh | Method for interception-proof near-field communication with inductive transponders of electronic documents |
| EP2193652A1 (en) * | 2007-09-26 | 2010-06-09 | Radeum, INC. DBA Freelinc | System and method for near field communications having local security |
| US20150281874A1 (en) * | 2013-12-31 | 2015-10-01 | Shenzhen Huiding Technology Co., Ltd. | Method and System for Near Field Communication of Electronic Device |
| CN109325577A (en) * | 2018-09-10 | 2019-02-12 | 李文昌 | A kind of rfid circuit and non-contact IC card alarm |
| CN109598159A (en) * | 2015-04-03 | 2019-04-09 | 北京奇虎科技有限公司 | Data Anti-theft device and method |
-
2020
- 2020-05-28 CN CN202010464562.7A patent/CN111654352A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007048399A1 (en) * | 2005-10-26 | 2007-05-03 | Acg Identification Technologies Gesellschaft Mbh | Method for interception-proof near-field communication with inductive transponders of electronic documents |
| EP2193652A1 (en) * | 2007-09-26 | 2010-06-09 | Radeum, INC. DBA Freelinc | System and method for near field communications having local security |
| US20150281874A1 (en) * | 2013-12-31 | 2015-10-01 | Shenzhen Huiding Technology Co., Ltd. | Method and System for Near Field Communication of Electronic Device |
| CN109598159A (en) * | 2015-04-03 | 2019-04-09 | 北京奇虎科技有限公司 | Data Anti-theft device and method |
| CN109325577A (en) * | 2018-09-10 | 2019-02-12 | 李文昌 | A kind of rfid circuit and non-contact IC card alarm |
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Application publication date: 20200911 |