Encrypting of communications using a transmitting/receiving apparatus via key information based on a multi-level code signal and a pseudo-random number sequence for modulation with an information signal
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04L-009/26
H04L-027/04
출원번호
UP-0702053
(2007-02-05)
등록번호
US-7835524
(2011-01-16)
우선권정보
JP-2006-030942(2006-02-08)
발명자
/ 주소
Ikushima, Tsuyoshi
Furusawa, Satoshi
Sada, Tomokazu
Fuse, Masaru
출원인 / 주소
Panasonic Corporation
대리인 / 주소
Wenderoth, Lind & Ponack, L.L.P.
인용정보
피인용 횟수 :
1인용 특허 :
8
초록▼
A highly concealable data communication apparatus based on an astronomical complexity and causing an eavesdropper to take a significantly increased time to analyze a cipher text, is provided. In a multi-level code generation section 111a, a random number sequence generation section 141 generates, ba
A highly concealable data communication apparatus based on an astronomical complexity and causing an eavesdropper to take a significantly increased time to analyze a cipher text, is provided. In a multi-level code generation section 111a, a random number sequence generation section 141 generates, based on predetermined key information 11, a plurality of modulation pseudo-random number sequences. The plurality of modulation pseudo-random number sequences is inputted to a multi-level conversion section 142 as a part of an input bit sequence which is converted into a multi-level code sequence 12. A multi-level processing section 111b combines the multi-level code sequence 12 and information data 10, and generates a multi-level signal 13 having a plurality of levels corresponding to a combination of the multi-level code sequence 12 and the information data 10.
대표청구항▼
What is claimed is: 1. A data transmitting apparatus for encrypting information data by using predetermined key information and for performing secret communication with a receiving apparatus, the data transmitting apparatus comprising: a multi-level code generation section for generating, based on
What is claimed is: 1. A data transmitting apparatus for encrypting information data by using predetermined key information and for performing secret communication with a receiving apparatus, the data transmitting apparatus comprising: a multi-level code generation section for generating, based on the predetermined key information, a multi-level code sequence in which a signal level changes so as to approximately represent random numbers; a multi-level processing section for combining the multi-level code sequence and the information data, and generating a multi-level signal having a plurality of levels corresponding to the combination of the multi-level code sequence and the information data; and a modulator section for performing predetermined modulation processing on the multi-level signal, and outputting a modulated signal, wherein the multi-level code generation section includes: a random number sequence generation section for generating, based on the predetermined key information, a plurality of modulation pseudo-random number sequences; and a multi-level conversion, into which a plurality of bit sequences including at least part of the plurality of modulation pseudo-random number sequences is inputted as an input bit sequence, for converting the input bit sequence into the multi-level code sequence, wherein the input bit sequence inputted into the multi-level conversion section is greater in a number of digits than each of the plurality of modulation pseudo-random number sequences generated by the random number sequence generation section, and wherein the multi-level processing section allocates different values of the information data to adjoining multi-levels of the multi-level signal. 2. The data transmitting apparatus according to claim 1, wherein at least one of the plurality of modulation pseudo-random number sequences is inputted to the multi-level conversion section as a lowest-order bit of the input bit sequence. 3. The data transmitting apparatus according to claim 1, wherein the multi-level code generation section further includes a physical random number generation section for generating one or more physical random number sequences, and wherein the one or more physical random number sequences are inputted, into the multi-level conversion section, as remaining bit sequences of the input bit sequence after excluding the at least part of the plurality of modulation pseudo-random number sequences. 4. The data transmitting apparatus according to claim 1, wherein fixed values are inputted, into the multi-level conversion section, as remaining bit sequences of the input bit sequence after excluding the at least part of the plurality of modulation pseudo-random number sequences. 5. The data transmitting apparatus according to claim 1, wherein the multi-level code generation section further includes a physical random number generation section for generating one or more physical random number sequences, and wherein the one or more physical random number sequences are inputted, into the multi-level conversion section, as a part of the plurality of bit sequences of the input bit sequence after excluding the at least part of the plurality of modulation pseudo-random number sequences, and wherein fixed values are inputted, into the multi-level conversion section, as remaining bit sequences of the input bit sequence. 6. The data transmitting apparatus according to claim 1, wherein a signal generated based on a predetermined rule is inputted, into the multi-level conversion section, as remaining bit sequences of the input bit sequence after excluding the at least part of the plurality of modulation pseudo-random number sequences. 7. The data transmitting apparatus according to claim 6, wherein the signal generated based on the predetermined rule is generated by delaying a part or a whole of the plurality of modulation pseudo-random number sequences by a predetermined time period. 8. The data transmitting apparatus according to claim 3, wherein a ratio of an information amplitude, which corresponds to an amplitude of the information data, to a fluctuation width of the multi-level signal is greater than a signal-to-noise ratio that is acceptable to a legitimate receiving party. 9. The data transmitting apparatus according to claim 1, wherein the random number sequence generation section includes: a pseudo-random number generation section for generating, based on the predetermined key information, a pseudo-random number series which is in a binary format; and a serial/parallel conversion section for performing serial/parallel conversion of the pseudo-random number series generated by the pseudo-random number generation section, and outputting the plurality of modulation pseudo-random number sequences. 10. The data transmitting apparatus according to claim 1, wherein the random number sequence generation section includes: a pseudo-random number generation section for generating, based on the predetermined key information, a pseudo-random number series which is in a binary format; a plurality of serial/parallel conversion sections for performing serial/parallel conversion of the pseudo-random number series generated by the pseudo-random number generation section and outputting the plurality of modulation pseudo-random number sequences; a first switch for switching, based on a rate selection signal, an output destination of the pseudo-random number series generated by the pseudo-random number generation section, between the plurality of serial/parallel conversion sections; and a second switch for selecting, based on the rate selection signal, and outputting the plurality of modulation pseudo-random number sequences outputted from the plurality of serial/parallel conversion sections, and wherein the plurality of serial/parallel conversion sections output respectively different numbers of the plurality of modulation pseudo-random number sequences. 11. A data receiving apparatus for receiving information data encrypted by using predetermined key information and for performing secret communication with a transmitting apparatus, the data receiving apparatus comprising: a multi-level code generation section for generating, based on the predetermined key information, a multi-level code sequence in which a signal level changes so as to approximately represent random numbers; a demodulator section for demodulating, in a predetermined demodulation method, a modulated signal received from the transmitting apparatus, and outputting, as a result of the demodulating, a multi-level signal having a plurality of levels corresponding to a combination of the information data and the multi-level code sequence; and a decision section for deciding, based on the multi-level code sequence, different values of the information data that are allocated to adjoining multi-levels of from the multi-level signal, wherein the multi-level code generation section includes: a random number sequence generation section for generating, based on the predetermined key information, a plurality of demodulation pseudo-random number sequences; and a multi-level conversion section, into which a plurality of bit sequences including at least part of the plurality of demodulation pseudo-random number sequences is inputted as an input bit sequence, for converting and which converts the input bit sequence into the multi-level code sequence, and wherein the input bit sequence inputted into the multi-level conversion section is greater in a number of digits than each of the plurality of demodulation pseudo-random number sequences generated by the random number sequence generation section. 12. The data receiving apparatus according to claim 11, wherein fixed values are inputted, into the multi-level conversion section, as remaining bit sequences of the input bit sequence after excluding the at least part of the plurality of demodulation pseudo-random number sequences. 13. The data receiving apparatus according to claim 11, wherein a signal generated based on a predetermined rule is inputted, into the multi-level conversion section, as remaining bit sequences of the input bit sequence after excluding the at least part of the plurality of demodulation pseudo-random number sequences. 14. The data receiving apparatus according to claim 11, wherein the signal generated based on the predetermined rule is generated by delaying a part or a whole of the plurality of demodulation pseudo-random number sequences by a predetermined time period. 15. The data receiving apparatus according to claim 11, wherein a ratio of an information amplitude, which corresponds to an amplitude of the information data to a fluctuation width of the multi-level signal, which corresponds to remaining bit sequences, after excluding the plurality of demodulation pseudo-random number sequences, of the input bit sequence, is greater than a signal-to-noise ratio that is acceptable to a legitimate receiving party. 16. The data receiving apparatus according to claim 11, wherein the random number sequence generation section includes: a pseudo-random number generation section for generating, based on the predetermined key information, a pseudo-random number series which is in a binary format; and a serial/parallel conversion section for performing serial/parallel conversion of the pseudo-random number series generated by the pseudo-random number generation section, and outputting the plurality of demodulation pseudo-random number sequences. 17. The data receiving according to claim 11, wherein the random number sequence generation section includes: a pseudo-random number generation section for generating, based on the predetermined key information, a pseudo-random number series which is in a binary format; a plurality of serial/parallel conversion sections for performing serial/parallel conversion of the pseudo-random number series generated by the pseudo-random number generation section and outputting the plurality of demodulation pseudo-random number sequences; a first switch for switching, based on a rate selection signal, an output destination of the pseudo-random number series generated by the pseudo-random number generation section, between the plurality of the serial/parallel conversion sections; and a second switch for selecting, based on the rate selection signal, and outputting the plurality of demodulation pseudo-random number sequences series outputted from the plurality of serial/parallel conversion sections, and wherein the plurality of serial/parallel conversion sections outputs respectively different numbers of the plurality of demodulation pseudo-random number sequences. 18. A data transmitting method for encrypting information data by using predetermined key information and for performing secret communication with a receiving apparatus, the data transmitting method comprising: a multi-level code generation step of generating, based on the predetermined key information, a multi-level code sequence in which a signal level changes so as to approximately represent random numbers; a multi-level processing step of combining the multi-level code sequence and the information data, and generating a multi-level signal having a plurality of levels corresponding to the combination of the multi-level code sequence and the information data; and a modulation step of performing predetermined modulation processing on the multi-level signal, and outputting a modulated signal, wherein the multi-level code generation step includes: a random number sequence generation step of generating, based on the predetermined key information, a plurality of modulation pseudo-random number sequences; and a multi-level conversion step of inputting, as an input bit sequence, a plurality of bit sequences including at least part of the plurality of modulation pseudo-random number sequences, and converting the input bit sequence into the multi-level code sequence, wherein the input bit sequence is greater in a number of digits than each of the plurality of modulation pseudo-random number sequences, and wherein the multi-level processing step allocates different values of the information data to adjoining multi-levels of the multi-level signal. 19. A data receiving method for receiving information data encrypted by using predetermined key information and for performing secret communication with a transmitting apparatus, the data receiving method comprising: a multi-level code generation step of generating, based on the predetermined key information, a multi-level code sequence in which a signal level changes so as to approximately represent random numbers; a demodulation step of demodulating, in a predetermined demodulation method, a modulated signal received from the transmitting apparatus, and outputting, as a result of the demodulating, a multi-level signal having a plurality of levels corresponding to a combination of the information data and the multi-level code sequence; and a decision step of deciding, based on the multi-level code sequence, different values of the information data that are allocated to adjoining multi-levels of from the multi-level signal, wherein the multi-level code generation step includes: a random number sequence generation step of generating, based on the predetermined key information, a plurality of demodulation pseudo-random number sequences; and a multi-level conversion step of inputting, as an input bit sequence, a plurality of bit sequences including at least part of the plurality of demodulation pseudo-random number sequences, and converting the input bit sequence into the multi-level code sequence, and wherein the input bit sequence is greater in a number of digits than each of the plurality of demodulation pseudo-random number sequences.
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이 특허에 인용된 특허 (8)
Lippel Bernard (West Long Branch NJ), Analog television with regenerable and encryptable signals.
Butterfield Lee A ; Giallorenzi Thomas R ; Gibson ; Jr. L Andrew ; Griffin Dan M ; Harris Johnny M ; Perkins Steven B ; Steagall R William, Data scrambling system and method and communications system incorporating same.
Sada, Tomokazu; Fuse, Masaru; Furusawa, Satoshi; Ikushima, Tsuyoshi, Data transmitting apparatus, data receiving apparatus and data communication apparatus.
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