CN201444674U - Bidirectional identification device of digital film mobile projection player and projector - Google Patents

Abstract

The utility model discloses a bidirectional identification device of a digital film mobile projection player and a projector, wherein the hardware of the device is identification modules which are arranged in the player and the projector, the device comprises a random number generator, an enciphering module, a deciphering module and a comparator, the following actions are carried out combining with inner software, the random number generator in the identification module in the player alternately generates random numbers and transmits the random numbers to the enciphering module for enciphering, then data is transmitted to the projector, the identification module in the projector receives the data enciphered by the player through a video frequency interface, and deciphers the data through the deciphering module, and then the data is transmitted to the player, after the player receives the data, whether the data is consistent to the data transmitted before is judged through the comparator in the identification module, then the compared results are transmitted to the player for further processing, and the projector also adopts the same mode to identify with the player. The system has higher information safety, is easy to realize, has low cost, and is suitable for being widely popularized.

Description

Digital movies mobile playing player and projector's two-way authentication device

Technical field

The utility model relates to a kind of digital film projector management equipment, relates in particular to the broadcast and the projection arrangement of the method and the digital movies mobile playing system of two-way authentication between a kind of digital movies mobile playing player and the projector.

Background technology

" 2131 engineering " cross-centennial rural area film engineering that to be five ministries and commissions such as State Administration of Radio Film and Television, Ministry of Culture proposed in 1998 and cultural construction project (, realizing the target that each administrative village (community) each month puts kinema) promptly in 21 century.State Administration of Radio Film and Television has issued technological guidance's property file GD/J103-2007 " digital movies mobile playing specification requirement ", comes standard digital movies mobile playing the system design and the exploitation of (comprising player, projector, audio amplifier, loudspeaker, curtain).Its inherent public good is popularized character, has determined that all devices all is to be provided funds to purchase by government, freely is dispensed into each screening point.Prior art requires and method can not guarantee the specificity of the said equipment, also lacks the maintenance and the management of standard for described equipment, and this just needs the method that a kind of equipment room authenticates mutually badly.

HDCP agreement between existing playback equipment and the projector equipment is mainly used in digital content protection, promptly prevents the encryption technology of digital content piracy.Player and projecting apparatus be as long as all supports the HDCP agreement, no matter model separately, can both finish and play and show.The HDCP agreement does not reach the purpose of identification between player and the projecting apparatus.The NO.200610056829.9 patent disclosure a kind of content protecting method at DVI design, though realized the function of authentication to a certain extent.But the data during the mutual communication of its playback equipment and projector equipment are constant always unencryption id informations, be easy to like this be intercepted and captured crack, and its authentication is the unidirectional authentication of playback equipment to projector equipment, can not guarantee projection function authentication player, projector equipment can connect other playback equipment use like this, can not guarantee the specificity of equipment.

Summary of the invention

The purpose of this utility model is at current digital movie increased popularity, specificity when guaranteeing that projection equipment uses, supervision is respectively shown the show quality in place and the unified management of projection equipment is safeguarded better, and the method that authenticates mutually based on the regulation agreement between a kind of playback equipment and the projector equipment is provided.

A kind of digital movies mobile playing player and projector's two-way authentication device is characterized in that this device promptly is installed in the authentication module in player and the projecting apparatus, comprises tandom number generator, encrypting module, deciphering module and comparator;

Described tandom number generator is used for property generation random number at interval;

Described encrypting module is used to utilize cryptographic algorithm to carry out the number that tandom number generator produces is carried out encryption;

Described deciphering module, the encrypting module ciphered data that is used for corresponding instrument that its instrument of living in is received is decrypted processing;

Described comparator, the deciphering module decrypted data that is used for instrument that its instrument of living in is associated produces random number with the tandom number generator that sends before its instrument of living in and compares, and comparative result is met at its instrument of living in handles;

More than connect by bus between each unit;

Tandom number generator interval property generation random number in the described player in the authentication module is sent to encrypting module by bus with data and encrypts, by data wire these data are sent to the idle pin of video interface then, deliver in the projecting apparatus by the video connecting line again, authentication module receives the player ciphered data by video interface in the described projecting apparatus, and by the deciphering module in the authentication module with data decryption, return to player by video interface again, after described player receives data, judge by the comparator in the authentication module whether these data are consistent with the data that send before, and comparative result is transferred to player by data wire does further processing; Described projecting apparatus is also adopted in the same way and is authenticated with player.

Compared with prior art, advantage of the present utility model:

1) more existing DVI protections, what transmit mutually is some constant information, be easy to be cracked, be the information of change at random and the utility model transmits mutually, can not imitate, increased and cracked difficulty.

2) intermittent authentication is reduced to minimum to player and projector equipment Effect on Performance.

3) greatly guarantee specificity between player and the projecting apparatus, also can effectively guarantee show quality

4) the utility model only needs to make minimum change on the hardware configuration, is easy to realize.

In addition,, not only be convenient to produce, and with low costly be suitable for extensive popularization because it is simple in structure.

Description of drawings

The utility model comprises three width of cloth accompanying drawings:

Fig. 1 is the hardware syndeton schematic diagram of player described in the utility model and projecting apparatus;

Fig. 2 is that authentication module described in the utility model is formed structural representation;

Fig. 3 is a flow diagram of authentication procedures described in the utility model.

Embodiment

Reaching embodiment in conjunction with the accompanying drawings is further elaborated the utility model:

As shown in Figure 1, connection diagram for player and projecting apparatus, after player 10 and projecting apparatus 40 connected by video connecting line 70, described player 10 comprised its identification nucleus module authentication module 50, and described projecting apparatus 40 comprises its identification nucleus module authentication module 60.

With reference to Fig. 2, authentication module 50 and authentication module 60 comprise encrypting module 300, deciphering module 400, tandom number generator 100, comparator 500, and they connect communication by a certain bus 200 each other.Wherein encrypting module 300 can be encrypted data according to the coding rule of inside for encoder or arithmetic unit with disposal ability; And deciphering module 400 adopts same rule to carry out decoding processing with the arithmetic unit that adopts decoder or have disposal ability to carry out ciphered data through encrypting module 300.

Tandom number generator 100 in the player 10 in the authentication module 50 is property generation random number at interval, and can encrypt (as encryptions such as DES, 3DES, RSA) by some cryptographic algorithm of encrypting module 300, these data are sent to the idle pin of video interface 2 then, deliver to projecting apparatus 40 by video connecting line 70 again.Authentication modules 60 can receive players 10 ciphered data by video interface 30 in the projecting apparatus 40, and by the deciphering module 400 in the authentication module 60 with data decryption, give player 10 by video interface 30 passbacks again.After player 10 receives data, but by 500 judgment data of the comparator in the authentication module 50 with whether data consistent before, and comparative result be transferred to player 10 by data wire do further processing.

Tandom number generator 100 in the projecting apparatus 40 in the authentication module 60 is property generation random number at interval, and can encrypt by some cryptographic algorithm of encrypting module 300, these data are sent to the idle pin of video interface 2 then, deliver to player 10 by video connecting line 70 again.Authentication modules 50 can receive projecting apparatus 40 ciphered data by video interface 20 in the player 10, and by the deciphering module 400 in the authentication module 50 with data decryption, give projecting apparatus 40 by video interface 20 passbacks again.After projecting apparatus 40 receives data, but by 500 judgment data of the comparator in the authentication module 60 with whether data consistent before, and comparative result be transferred to projecting apparatus 40 by data wire do further processing.

Flow chart is described further the utility model in conjunction with now doing following hypothesis as shown in Figure 3:

1) suppose that mutually agreement produces 32 random numbers, preceding 8 be PKI, and being left 24 each results that count addition can be divided exactly by 8

2) suppose that cryptographic algorithm adopts the des encryption algorithm

3) preceding 10 minutes per minutes authentication of supposing play content once, movie after 10 minutes per 2 minutes the authentication once, movie after 60 minutes per 5 minutes the authentication once, and playback equipment authenticated to projector equipment before this, authentication is that projector equipment authenticates to playback equipment next time, and every authentication postpones 10 minutes by a projecting apparatus opening time

4) suppose that video interface takes the DVI interface, the video connecting line is the DVI line

5) suppose that it is 30 seconds that playback equipment and projector equipment wait the pending data return time mutually, overtime expression relevant device is undesirable, directly stops to show or output

6) projector equipment was in opening in 5 minutes that have just play

The idle pin of the transceive data end of the authentication module of player and projecting apparatus and DVI is connected, and authentication module possesses the generation random number and to the function of its encrypting and decrypting, but and store historical data and correction data difference, in conjunction with Fig. 3, this method is achieved as follows:

S100: the digital movie that selection will be play.

S200: projector is in opening in 5 minutes when just playing.

S300: the mutual communications protocol of player and projecting apparatus is according to hypothesis 1, producing random number such as tandom number generator is 0,235 6,897 4,125 6,844 3,987 5,687 4,132 1653, through supposing that 2 become 02,356,897 3,425 6,454 3,167 0,872 4,338 1261 after encrypting, it is sent to projecting apparatus by the DVI line by hypothesis 3.

S400: projecting apparatus receives above-mentioned enciphered data, and utilizing PKI and cryptographic algorithm inverse operation is 0,235 6,897 4,125 6,844 3,987 5,687 4,132 1653 with reduction of data, gives player with this number passback.

S500: player receives the data that projecting apparatus is beamed back, and by comparator itself and original data is compared, if identical, then carries out the authentication of projecting apparatus to player, carries out S600, can not show otherwise point out.

S600: it is 0,132 6,697 4,215 6,484 3,897 58,674,312 3165 that the tandom number generator of projecting apparatus produces random number, through supposing that 2 become 0,132 6,697 3,225 6,554 3,727 1,822 2,338 5221 after encrypting, it is sent to player by the DVI line by hypothesis 3.

S700: player receives above-mentioned enciphered data, and utilizing PKI and cryptographic algorithm inverse operation is 0,132 6,697 4,215 6,484 3,897 5,867 4,312 3165 with reduction of data, gives projecting apparatus with this number passback.

S800: after projecting apparatus receives the data that player beams back, itself and original data are compared,, then carry out S900, can not show otherwise point out if identical by comparator.

S900: player is from the video interface dateout, and proceeds S300.

The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and inventive concept thereof, all should be encompassed within the protection range of the present utility model.

Claims (1)

1. a digital movies mobile playing player and projector's two-way authentication device, it is characterized in that this device promptly is installed in the authentication module in player (10) and the projecting apparatus (40), comprises tandom number generator (100), encrypting module (300), deciphering module (400) and comparator (500);

Described tandom number generator (100) is used for property generation random number at interval;

Described encrypting module (300) is used to utilize cryptographic algorithm to carry out the number that tandom number generator (100) produces is carried out encryption;

Described deciphering module (400), encrypting module (300) ciphered data that is used for corresponding instrument that its instrument of living in is received is decrypted processing;

Described comparator (500), deciphering module (400) decrypted data that is used for instrument that its instrument of living in is associated produces random number with the tandom number generator (100) that sends before its instrument of living in and compares, and comparative result is met at its instrument of living in handles;

More than connect by bus (200) between each unit;

Tandom number generator (100) interval property generation random number in the interior authentication module of described player (10) (50) is sent to encrypting module (300) by bus (200) with data and encrypts, by data wire these data are sent to the idle pin of video interface (20) then, deliver in the projecting apparatus (40) by video connecting line (70) again, the interior authentication module of described projecting apparatus (40) (60) receives player (10) ciphered data by video interface (30), and by the deciphering module (400) in the authentication module (60) with data decryption, give player (10) by video interface (30) passback again, after described player (10) receives data, judge by the comparator (500) in the authentication module (50) whether these data are consistent with the data that send before, and comparative result is transferred to player (10) by data wire does further processing; Described projecting apparatus (40) is also adopted same in the same way player (10) and is authenticated.

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