CN1773969A - A Compression information channel communication safety tunnel - Google Patents
A Compression information channel communication safety tunnel Download PDFInfo
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- CN1773969A CN1773969A CN 200410052144 CN200410052144A CN1773969A CN 1773969 A CN1773969 A CN 1773969A CN 200410052144 CN200410052144 CN 200410052144 CN 200410052144 A CN200410052144 A CN 200410052144A CN 1773969 A CN1773969 A CN 1773969A
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Abstract
A communication safety tunnel of compression channel consists of data enciphering / deciphering unit located in start point device and end point device of tunnel, compression channel being end to end generalized channel containing source compression coding or / and source compression decoding on communication link, compression channel adaptor being able to be compression channel data transformer / reverse transformer or being able to be compression channel coder / decoder or being able to be compression channel modem.
Description
Technical field
The present invention relates to information security and secret, information processing and transmission (communication), is a kind of compression channel communication security tunnel.
Background technology
Information Compression, for example voice compression coding, video compression coding are widely used in every field such as digital communication, digital broadcasting, Digital Television, digital camera, digital music.Particularly the radio communication in public cellular mobile communications networks (being air interface) is all used voice compression coding.For example the long time limit of GSM standard cellular mobile communication service regeulations pulse excitation is predicted (RPE-LTP) voice compression coding, analog voice signal is carried out the 8kHz sampling, frame length 20ms, 160 PCM samplings of every frame, each 13 bit linear PCM that sample quantizes, speed is 104kbps, and the speed behind the compressed encoding is 13kbps.CDMA standard cellular mobile communication uses Qualcomm code book Excited Linear Prediction (QCELP) voice compression coding or enhancement mode variable Rate (EVRC) voice compression coding, analog voice signal is carried out the 8kHz sampling, frame length 20ms, 160 PCM samplings of every frame, each 16 bit linear PCM that sample quantizes, speed is 128kbps, and the speed behind the compressed encoding is 8kbps.
Voice compression coding mainly is to utilize correlation very strong between the voice signal sample to realize, promptly there is very big redundancy in voice signal, and compress speech is also removed by discerning these signal redundancies, thereby realizes compression.This is a kind of lossy compression method coding, and the decoding data recovered can not be corresponding fully one by one with initial data, but can restore the signal waveform envelope preferably.
At present, in public cellular mobile communications networks, the mobile phone of making a start carries out analog-to-digital conversion, sampling, linear PCM coding to analog voice signal, after the voice compression coding, by being wirelessly transmitted to the base station, the base station decompress(ion) is condensed to 64kbps PCM speech data, transmits in core net.64kbps PCM voice data transmission is to the base station, after 64kbps PCM speech data was compressed in the base station, by being wirelessly transmitted to the mobile phone of receiving end, the mobile phone decompress(ion) of receiving end was condensed to the PCM speech data, become analog voice signal through digital-to-analogue conversion, amplify back excitation loudspeaker and sound.When the 64kbps of mobile radio communication PCM voice data transmission to the PSTN switch, the PSTN switch becomes 64kbps PCM speech data into analog voice signal by digital-to-analogue conversion, is transferred to pstn telephone machine (being wire telephone) by the subscribers feeder loop.Otherwise the analog voice signal of pstn telephone machine is transferred to the PSTN switch by the subscribers feeder loop, the PSTN switch with analog voice signal carry out analog-to-digital conversion, the sampling become 64kbps PCM speech data, in core net, transmit.64kbps PCM voice data transmission is to the base station, after 64kbps PCM speech data was compressed in the base station, by being wirelessly transmitted to the mobile phone of receiving end, the mobile phone decompress(ion) of receiving end was condensed to the PCM speech data, become analog voice signal through digital-to-analogue conversion, amplify back excitation loudspeaker and sound.Therefore, mobile phone contains voice compression coding and decoding to pstn telephone machine or pstn telephone machine to mobile phone or mobile phone to the communication link of mobile phone.
Because voice compression coding is a kind of lossy compression method coding, speech data after data or the encryption, by mobile phone to mobile phone or mobile phone to the pstn telephone machine or the pstn telephone machine after the voice channel transmission of mobile phone, information is damaged seriously, receiving end can not recover the originating data that is transmitted.Therefore, voice encryption end to end or the data communication that does not also realize at present by voice compression coding and decode channel.
In the GSM cellular mobile communications networks,, can realize voice encryption or data communication end to end by circuit switched data communication.But network need increase a large amount of IWF (interworking function), at mobile phone or modulator-demodulator end, also will use complicated AT order, and communication delay is bigger than the time delay of voice channel.The not support circuit-switched data communication of CDMA2000 1X cellular mobile communications networks that China is present.
GSM/GPRS and cdma cellular mobile radio communication are supported the IP packet switched data communication, IP-based Speech Communication, and communication delay is also bigger than the time delay of circuit switched data communication, has delay variation and packet loss, and real-time is poor.
Summary of the invention
For the voice encryption end to end that lack settling time, time delay is short, real-time, interoperability is good of realizing communicate by letter on network facilities bases such as existing digital communication and digital broadcasting is communicated by letter with data or data encryption, the invention provides a kind of compression channel communication security tunnel, with the channel that contains compressed encoding and decoding is Bearer Channel, by outer net or/and Intranet forms a real-time end to end communication security passage.
To the communication link of mobile phone, contain compressed encoding and decoding to pstn telephone machine or pstn telephone machine to mobile phone or mobile phone at mobile phone, digital broadcast channel in digital broadcast transmitting platform (station) and digital broadcasting transmitter formation contains compressed encoding and decoding, these channels can be called compression channel.
In existing digital communication and digit broadcasting system, generally there is information source to compile (separating) sign indicating number, channel volume (separating) sign indicating number, modulation (demodulation) device.It is to carry out conversion according to the characteristics of information itself that information source is compiled (separating) sign indicating number, to satisfy the requirement of Channel Transmission, and for example Channel Transmission bandwidth, transmission rate etc.Channel volume (separating) sign indicating number is the characteristics according to channel, and for example noise and interference, decline etc. encoded to information, and the protection reliable information transmission is commonly referred to error correction (error detection) and compiles (separating) sign indicating number.Modulation (demodulation) device is the characteristics according to channel, and for example Rayleigh fading is carried out conversion to signal, with the transmission of adaptive channel.It is that a kind of information source is compiled (separating) sign indicating number that the voice and video Information Compression is compiled (separating) sign indicating number, and usually said channel does not contain information source compiles (separating) sign indicating number.Therefore, contain source encoding or/and the compression channel of source coding is a kind of generalized channel.
A kind of compression channel communication security tunnel, it is a kind of VLL, data communications security passage end to end is provided, encrypting and decrypting, compression channel and compression channel adapter are arranged, data of making a start in the tunnel or data encrypted after the processing of compression channel adapter, arrive the tunnel receiving end by compression channel, after receiving end compression channel adapter is handled, recover the data of making a start or decrypt the data of making a start.
Encrypting and decrypting is the digital encryption deciphering that is arranged in tunnel starting point and end device.
Compression channel is to contain the information source compressed encoding on the communication link or/and the generalized channel end to end of information source compression coding.
The compression channel adapter can be compression channel data conversion and inverse transformer or compression channel coding decoder or compression channel modulator-demodulator.
Information Compression is a kind of lossy coding, and compression coding (decompression) can not recover the information before the compressed encoding fully.Therefore, compression channel is a kind of channel that diminishes.The compression channel adapter is to handling by the information of compression channel, so that by behind the compression channel, this information is not damaged, perhaps Sun Shang degree can be accepted.Promptly can recover by the data behind the compression channel or in the data that satisfy after recovering under the desired error rate to pass through compression channel.
Compression channel data conversion and inverse transformer are according to the characteristics of compression channel to the information damage, method by compression channel data conversion and inverse transformation, to handling by the originating data of compression channel, make data after the conversion by behind the compression channel, recover the data of making a start by inverse transformation in receiving end.The method of compression channel data conversion and inverse transformation comprises that non-speech data is to the conversion (mapping) of speech data, the conversion of increase data dependence etc.
The compression channel coding decoder is according to the characteristics of compression channel to the information damage, method by the compression channel coding and decoding, to handling by the originating data of compression channel, the data behind the feasible coding recover the data of making a start by behind the compression channel in receiving end by decoding.The method of compression channel coding and decoding comprises the decoding of line codings such as the decoding of source encodings such as error correction coding decoding, voice and video, AMI sign indicating number, HDB3 sign indicating number such as block code, convolution code, based on the coding and decoding of voice code book etc.
The compression channel modulator-demodulator is according to the characteristics of compression channel to the information damage, method by the compression channel modulation, to handling by the originating data of compression channel, so that adapt to the Channel Transmission that damage is arranged, damage-resistant can be good, data after the feasible modulation recover the data of making a start by behind the compression channel in receiving end by demodulation.The method of compression channel modulation comprises Modulation and Amplitude Modulation demodulation, phase modulated demodulation, frequency modulation(FM) demodulation or their combination.
The beneficial effects of the utility model:
The invention provides with the good compression channel of real-time is the secure tunnel of Bearer Channel, can will be in a large number abundant and resource that contain the existing level security differences such as wired or wireless, mobile communications network, radio network and terminal of voice, video compression easily is used in actual time safety security service or the real-time data service.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a functional-block diagram of the present invention.
Fig. 2 is the block diagram of embodiment.
In the drawings, 1 for encrypting, and 2 is the compression channel adapter, and 3 is compression channel, and 4 are deciphering, and 5 is voice compression coding, and 6 are the compress speech decoding, and 7 is analog-to-digital conversion, and 8 are digital-to-analogue conversion.
Embodiment
In the present embodiment, communication network is the GSM cellular mobile communications networks, and terminal is a GSM mobile handset.Compression channel (3) comprises the mobile phone of making a start, make a start base station and base station controller, switch, receiving end base station and base station controller, receiving end mobile phone.The mobile phone of making a start comprises make a start mobile phone internal audio frequency input amplifier and the analog to digital converter that is connected with earphone jack, the long time limit prediction of the mobile phone Regular-Pulse Excitation of making a start (RPE-LTP) voice compression coding device, wireless channel encoder, wireless sender; Make a start base station and base station controller comprises wireless receiver, wireless channel decoder, RPE_LTP compressed voice decoder, base station controller; Receiving end base station and base station controller comprise base station controller, RPE_LTP speech coder, wireless channel encoder, wireless sender; Inner digital to analog converter of receiving end mobile phone and audio frequency output amplifier that the receiving end mobile phone comprises wireless receiver, wireless channel decoder, RPE_LTP compressed voice decoder, is connected with earphone jack.The input signal of this compression channel and output signal all are voice analog signals.
Analog-to-digital conversion (7) becomes the voice analog signal amplification sampling of microphone input into the PCM speech data; Digital to analog converter (8) becomes the PCM speech data voice analog signal and amplifies the driving loudspeaker; Voice compression coding (5) is the speech data of 2.4kbps or 1.2kbps with PCM speech data compressed encoding; Compress speech decoding (6) is condensed to the PCM speech data with the compressed voice coded data decompress(ion) of 2.4kbps or 1.2kbps; The speed of data encrypted is constant, but great changes have taken place the speech data correlation; The compression channel adapter (2) of making a start is a bipolarity line coder, 1 bit binary number " 0 " is encoded into the positive level that pulsewidth is 1/2.4 millisecond of promptly about 0.416ms (perhaps 1/1.2 millisecond of promptly about 0.833ms), 1 bit binary number " 1 " is encoded into the negative level that pulsewidth is 1/2.4 millisecond of promptly about 0.416ms (perhaps 1/1.2 millisecond of promptly about 0.833ms), 1/2.4 millisecond of corresponding data speed 2.4kbps wherein, 1/1.2 millisecond of corresponding data speed 1.2kbps.
The compression channel adapter (2) of receiving end is a sampling judgement decoder, and the signal of compression channel output is pressed 9.6kHz sampling judgement, and the positive level judgement is " 0 ", and negative positive level judgement is " 1 ".Therefore, for the data of 2.4kbps speed, corresponding 4 the sampling decision values of 1 bit binary number; For the data of 1.2kbps speed, corresponding 8 the sampling decision values of 1 bit binary number.In 4 (or 8) sampling, the number of positive level is during greater than the number of negative level, adjudicate to be binary digit " 0 ", otherwise, adjudicate and be binary digit " 1 ".
Encrypt (1), the compression channel adapter (2) of making a start, compression channel (3), receiving end compression channel adapter (2), deciphering (4) has constituted is the real-time end to end mobile communication escape way of Bearer Channel, i.e. compression channel communication security tunnel with the compression channel.
Analog-to-digital conversion (7), digital-to-analogue conversion (8), voice compression coding (5), compress speech decoding (6), encrypt (1), deciphering (4), compression channel adapter (2) can constitute one with the supporting voice encryption earphone of mobile phone, the voice encryption that utilizes existing mobile phone and mobile communications network to realize that real-time is good is end to end communicated by letter.
The voice analog signal that the microphone of encryption earphone picks up is through analog-to-digital conversion (7) output PCM speech data, speech data through voice compression coding (5) boil down to 2.4kbps (or 1.2kbps), be input to encryption (1), data encrypted is 2.4kbps (or 1.2kbps), be input to the compression channel adapter (2) of making a start, carry out the bipolarity line coding, binary digit " 0 " is encoded into the positive level that pulsewidth is 0.416ms (or 0.833ms), and binary digit " 1 " is encoded into the negative level that pulsewidth is 0.416ms (or 0.833ms).The line code signal is input to the audio input end of the earphone jack of mobile phone, enter compression channel, be transferred to the mobile phone of receiving end, from the line code signal of the earphone horn interface of receiving end mobile phone output is the compression channel adapter (2) that the output signal of compression channel is input to receiving end, with 9.6kHz speed sampling judgement decoding, output 2.4kbps (or 1.2kbps) binary data, 2.4kbps (or 1.2kbps) data after deciphering (4) deciphering, be input to compress speech decoding (6), output PCM speech data, be reduced into analog voice signal through digital-to-analogue conversion (8), amplify the driving loudspeaker and emit sound.
When the compression channel input and output all are the PCM speech data, bluetooth cellular phone for example, blue tooth interface is by wireless radio transmission PCM speech data.The compression channel adapter (2) of making a start in this case, can be a compression channel data converter.When data rate is 2.4kbps and PCM speech data when being 64kbps (8 of 8kHz sampling, each samplings), 1 bit binary number " 0 " can be transformed to the PCM data of 4 bytes, each byte is 0x10; 1 bit binary number " 1 " can be transformed to the PCM data of 4 bytes, each byte is 0xf0.When data rate is 1.2kbps and PCM speech data when being 64kbps, 1 bit binary number " 0 " can be transformed to the PCM data of 8 bytes, each byte is 0x10; 1 bit binary number " 1 " can be transformed to the PCM data of 8 bytes, each byte is 0xf0.
The compression channel adapter (2) of receiving end can be a data judgement converter.Data for 2.4kbps (or 1.2kpbs) speed, corresponding 1 bit binary number of 4 (or 8) byte PCM data, are adjudicated and are binary digit " 1 " more than less than the byte number of 0x80 the time greater than the byte number of 0x80, otherwise, adjudicate and be binary digit " 0 ".
Analog-to-digital conversion (7), digital-to-analogue conversion (8), voice compression coding (5), compress speech decoding (6), encryption (1), deciphering (4), compression channel adapter (2) and blue tooth interface can constitute a kind of Bluetooth encryption earphone.
The voice analog signal that the microphone of Bluetooth encryption earphone picks up, through analog-to-digital conversion (7) output PCM speech data, speech data by voice compression coding (5) boil down to 2.4kbps (or 1.2kbps), be input to encryption (1), data encrypted is 2.4kbps (or 1.2kbps), be input to the compression channel adapter (2) of making a start, carry out data conversion, 1 bit binary number " 0 " is transformed to the PCM data of 4 (or 8) bytes, each byte is 0x10,1 bit binary number " 1 " is transformed to the PCM data of 4 (or 8) bytes, each byte is 0xf0, the data conversion that is about to 2.4kbps (or 1.2kbps) is 64kbps PCM data, the back emission is amplified in wireless sender modulation by bluetooth earphone, the blue teeth wireless receiver of mobile phone receives and is demodulated into 64kbps PCM data, enter compression channel, be transferred to the mobile phone of receiving end, amplify the back emission from the blue teeth wireless sender modulation of receiving end mobile phone, the bluetooth earphone of receiving end is wireless, and the receiver receiving demodulation goes out 64kbps PCM data, enter the compression channel adapter (2) of receiving end, carry out inverse transformation, the data contravariant of 64kbps is changed to the data of 2.4kbps (or 1.2kbps), be input to deciphering (4), the data of 2.4kbps after the deciphering (or 1.2kbps) are input to compress speech decoding (6), output PCM speech data, be reduced into analog voice signal through digital-to-analogue conversion (8), amplify the driving loudspeaker and emit sound.
Also analog-to-digital conversion (7), digital-to-analogue conversion (8), voice compression coding (5), compress speech decoding (6), encryption (1), deciphering (4), compression channel adapter (2) can be integrated in the mobile phone the inside, form the voice encryption mobile phone.
In the compression channel communication security tunnel shown in Fig. 1 and Fig. 2 is unidirectional, and two-way compression channel communication security tunnel similarly.
Similarly, existing mobile phone and mobile communications network be can utilize, real-time is good end to end data encryption communication or data communication realized.Can realize end to end real-time voice encryption or data encryption or the data communication of mobile phone to pstn telephone machine or pstn telephone machine to mobile phone.
Claims (4)
1, a kind of compression channel communication security tunnel, it is a kind of VLL, data communications security passage end to end is provided, it is characterized in that it also has encrypting and decrypting, compression channel and compression channel adapter, data of making a start in the tunnel or data encrypted after the processing of compression channel adapter, arrive the tunnel receiving end by compression channel, after receiving end compression channel adapter is handled, recover the data of making a start or decrypt the data of making a start.
2, a kind of compression channel communication security according to claim 1 tunnel is characterized in that encrypting and decrypting is the digital encryption deciphering that is arranged in tunnel starting point and end device.
3, a kind of compression channel communication security according to claim 1 tunnel is characterized in that compression channel is to contain the information source compressed encoding on the communication link or/and the generalized channel end to end of information source compression coding.
4, a kind of compression channel communication security according to claim 1 tunnel is characterized in that the compression channel adapter can be compression channel data conversion and inverse transformer or compression channel coding decoder or compression channel modulator-demodulator.
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| CN 200410052144 CN1773969A (en) | 2004-11-11 | 2004-11-11 | A Compression information channel communication safety tunnel |
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| CN 200410052144 CN1773969A (en) | 2004-11-11 | 2004-11-11 | A Compression information channel communication safety tunnel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131189A (en) * | 2010-12-28 | 2011-07-20 | 中国电信股份有限公司 | Acquisition instrument, mobile supervision method and system |
| CN103000181A (en) * | 2013-01-10 | 2013-03-27 | 成都零光量子科技有限公司 | System and implement method thereof for secret communications based on public communication network voice channel |
| CN113225239A (en) * | 2020-01-21 | 2021-08-06 | 恩智浦有限公司 | Controller and transceiver for controller area network |
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2004
- 2004-11-11 CN CN 200410052144 patent/CN1773969A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131189A (en) * | 2010-12-28 | 2011-07-20 | 中国电信股份有限公司 | Acquisition instrument, mobile supervision method and system |
| CN102131189B (en) * | 2010-12-28 | 2014-11-12 | 中国电信股份有限公司 | Acquisition instrument, mobile supervision method and system |
| CN103000181A (en) * | 2013-01-10 | 2013-03-27 | 成都零光量子科技有限公司 | System and implement method thereof for secret communications based on public communication network voice channel |
| CN103000181B (en) * | 2013-01-10 | 2015-02-11 | 成都零光量子科技有限公司 | System and implement method thereof for secret communications based on public communication network voice channel |
| CN113225239A (en) * | 2020-01-21 | 2021-08-06 | 恩智浦有限公司 | Controller and transceiver for controller area network |
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