Apparatus and method for preventing information leakage

Patent metadata

Field	Value
Publication number	US-10320518-B2
Application number	US-201715807917-A
Country	US
Kind code	B2
Filing date	Nov 9, 2017
Priority date	Dec 29, 2016
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

An apparatus and a method for preventing an information leakage. The apparatus for preventing the information leakage includes a shielding signal pattern generation unit configured to generate a shielding signal pattern including a radiation band and a radiation suppression band; a shielding signal generation unit configured to generate an electromagnetic leakage shielding signal corresponding to an Orthogonal Frequency Division Multiplexing (OFDM) scheme by using the shielding signal pattern; a signal amplification unit configured to amplify a transmitting power of the electromagnetic leakage shielding signal; and an antenna unit configured to transmit the amplified electromagnetic leakage shielding signal.

First claim

What is claimed is:

1. An apparatus for preventing an information leakage, comprising:
a shielding signal pattern generation unit configured to generate a shielding signal pattern including a radiation band and a radiation suppression band;
a shielding signal generation unit configured to generate an electromagnetic leakage shielding signal corresponding to an Orthogonal Frequency Division Multiplexing (OFDM) scheme by using the shielding signal pattern;
a signal amplification unit configured to amplify a transmitting power of the electromagnetic leakage shielding signal; and
an antenna unit configured to transmit the amplified electromagnetic leakage shielding signal,
wherein the shielding signal pattern generation unit generates the shielding signal pattern of a sample rate band including an operating frequency band, a guard frequency band, and an image frequency band.

2. The apparatus of claim 1 , wherein the shielding signal pattern generation unit generates the shielding signal pattern in a time domain by performing an Inverse Fast Fourier Transform (IFFT) on the sample rate band of a complex conjugated mirror form.

3. The apparatus of claim 2 , wherein the operating frequency band includes the at least one radiation band and the radiation suppression band.

4. The apparatus of claim 3 , wherein the shielding signal pattern generation unit assigns a valid subcarrier to the radiation band, and generates the shielding signal pattern by nulling at least one of the radiation suppression band, the guard frequency band, and the image frequency band.

5. The apparatus of claim 4 , wherein the shielding signal pattern generation unit divides the sample rate band into divided sample rate bands, the number of divided sample rate bands corresponding to the number of subcarriers, and generates the shielding signal pattern by assigning the valid subcarrier to one or more of the divided sample rate bands and nulling remaining divided sample rate bands except for the divided sample rate bands assigned by the valid subcarrier.

6. The apparatus of claim 5 , wherein the shielding signal pattern generation unit generates the shielding signal pattern by assigning the valid subcarrier to the image frequency band, the image frequency band being in a complex conjugated mirror relation with the radiation band.

7. The apparatus of claim 1 , further comprising:
a user interface unit for setting at least one of a sample rate band, the radiation band, the radiation suppression band, and the transmitting power by a user.

8. The apparatus of claim 1 , wherein the shielding signal pattern generation unit optimizes a Peak to Average Power Ratio (PAPR) of the shielding signal pattern.

9. The apparatus of claim 1 , wherein the shielding signal pattern generation unit generates the shielding signal pattern by assigning a random valid subcarrier to the radiation band, and performs an update with the shielding signal pattern.

10. A method of preventing information leakage, comprising:
generating a shielding signal pattern including a radiation band and a radiation suppression band;
generating an electromagnetic leakage shielding signal corresponding to an Orthogonal Frequency Division Multiplexing (OFDM) scheme by using the shielding signal pattern;
amplifying a transmitting power of the electromagnetic leakage shielding signal; and
transmitting the amplified electromagnetic leakage shielding signal,
wherein the generating the shielding signal pattern generates the shielding signal pattern of a sample rate band including an operating frequency band, a guard frequency band, and an image frequency band.

11. The method of claim 10 , wherein the generating the shielding signal pattern generates the shielding signal pattern in a time domain by performing an Inverse Fast Fourier Transform (IFFT) on the sample rate band of a complex conjugated mirror form.

12. The method of claim 11 , wherein the operating frequency band includes the at least one radiation band and the radiation suppression band.

13. The method of claim 12 , wherein the generating the shielding signal pattern assigns a valid subcarrier to the radiation band, and generates the shielding signal pattern by nulling at least one of the radiation suppression band, the guard frequency band, and the image frequency band.

14. The method of claim 13 , wherein the generating the shielding signal pattern divides the sample rate band into divided sample rate bands, the number of divided sample rate bands corresponding to the number of subcarriers, and generates the shielding signal pattern by assigning the valid subcarrier to one or more of the divided sample rate bands and nulling remaining divided sample rate bands except for the divided sample rate bands assigned by the valid subcarrier.

15. The method of claim 14 , wherein the generating the shielding signal pattern generates the shielding signal pattern by assigning the valid subcarrier to the image frequency band, the image frequency band being in a complex conjugated mirror relation with the radiation band.

16. The method of claim 10 , further comprising:
setting at least one of a sample rate band, the radiation band, the radiation suppression band, and the transmitting power by a user.

17. The method of claim 10 , wherein the generating the shielding signal pattern optimizes a Peak to Average Power Ratio (PAPR) of the shielding signal pattern.

18. The method of claim 10 , wherein the generating the shielding signal pattern generates the shielding signal pattern by assigning a random valid subcarrier to the radiation band, and performs an update with the shielding signal pattern.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Cho Hui-Rae
• Kim Jin-Hyun
• Hwang In-Ho
• Ju Sae-Hoon
• Lee Kyung-Hoon

Classifications

• H04K3/68 Primary

  using passive jamming, e.g. by shielding or reflection (shielding of apparatus or components against electric or magnetic field H05K9/00) · CPC title

• H04L27/2628

  Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators (H04L27/2634 takes precedence) · CPC title

• H04L27/2602

  Signal structure · CPC title

• H04L27/2614

  Peak power aspects · CPC title

• H04K3/28

  with jamming and anti-jamming mechanisms both included in a same device or system, e.g. wherein anti-jamming includes prevention of undesired self-jamming resulting from jamming · CPC title