Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
1998-07-24
2002-01-08
Peeso, Thomas R. (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S169000, C380S028000, C380S281000
Reexamination Certificate
active
06338139
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an information reproducing apparatus for reproducing information recorded on an information recording medium, an authenticating apparatus for effecting the authentication process, and an information processing system for transferring information by effecting the mutual authentication between a first apparatus and a plurality of second apparatuses.
Conventionally, an apparatus for reproducing information mixedly containing video information, audio information and still picture information recorded on an optical disk such as a DVD by use of an optical disk device is realized. Information reproduced by the optical disk device is processed by a processing circuit according to the type of information.
For example, if information contains MPEG video data, audio data (PCM, AC3), sub-picture data, navigation data and the like, information is processed by processing boards corresponding to the respective data items.
In this case, the main controller temporarily fetches data items and distributes the fetched data items-to the respective processing boards according to the types of the data items.
In this case, in a period of data distribution, the main controller is occupied. Therefore, if the amount of information reproduced from the optical disk device becomes large, the load of the main controller is increased and the main controller cannot effect other processes for a long period of time.
Further, conventionally, as a bidirectional subject authentication method known as the encoding (obfuscating) technique, a method using an electronic signature by use of a public key(asymmetric key) such as an RSA (public key encryption algorithm) is well known.
For example, the following methods are well known.
1] “A” transmits a random character to “B” as “challenge”.
2] “B” signs the character with the public key which “B” has and sends back the character to “A” as “report”. “A” inquires of an authentication station (CA center) which is a third party storing the public key of “B” and decodes (deciphers) information returned from “B” by use of the public key from the authentication station. If the result of decipher coincides with the character which “A” first transmitted, “B” is identified as the person himself.
3] “B” transmits a random character to “A” as “challenge”.
4] “A” signs the character with the public key which “A” has and sends back the character to “B” as “report”. “B” inquires of an authentication station (CA center) which is a third party storing the public key of “A” and decodes (deciphers) information returned from “A” by use of the public key from the authentication station. If the result of decipher coincides with the character which “B” first transmitted, “A” is identified as the person himself.
However, with the above method, the third party (authentication station (CA center)) storing the public key is required, it is necessary to inquire of the authentication station (CA center) which is the third party storing the public key by communication at each time of bidirectional subject authentication, and thus the process becomes extremely complicated.
Further, when the public key which the third party manages is used, the public key tends to be stolen and the security protection is difficult.
A method for mutually exchanging encoding (obfuscating) keys is known in the prior art, but the way the mutually exchanged encoding keys are used is little known except a case wherein the encoding key is used to encode transfer information.
Further, with the above method, when the place in which the other party to be authenticated is previously known, information to be transmitted is determined, and the other party to whom information is transmitted (to be authenticated) is searched for, the above method cannot be used. That is, conventionally, no effective method is proposed for a method for searching for the other party to be authenticated.
BRIEF SUMMARY OF THE INVENTION
This invention can transfer data between an information reproducing apparatus and processing boards without using a main controller and can alleviate the load of the main controller and thus the main controller can effect other processes during the information transferring period.
Further, this invention can effect the encoding (obfuscating)/decoding (deciphering) process in an extremely simple construction.
This invention can easily effect the mutual authentication operation without using a third party which manages public keys, that is, this invention can make it unnecessary to use the third party or inquire of the third party and can effect the mutual authentication operation extremely easily with high reliability.
Further, this invention can prevent leak of information with reliability extremely higher than a case wherein the public key system is used by further obfuscating an obfuscating key by use of the transferred obfuscating key.
In this invention, an authentication object (which is to be authenticated) is identified based on information (stream ID) indicating the type of information attached to information transmitted from the information recording medium, each authentication object is authenticated, then information can be distributed (transmitted) to the authentication objects in parallel, and as a result, the load of the authentication object is relatively alleviated and information can be displayed on the display screen in a short period of time after reproduction of information from the information recording medium is started, and time lag can be suppressed to minimum.
In this invention, the authentication object can be searched for based on information to be transmitted, and the authentication object can be searched for by use of the relatively simple method by supplying information to candidates of the authentication object, causing the candidates to send back responses and effecting the mutual authentication operation based on the results of responses.
Further, in this invention, since an obfuscating information storing memory provided in an authentication functional section, information can be arranged in order by using a clock which is independent from the memory. Since obfuscated information is previously recorded on an external transfer data storing section by use of the clock inherent to the authenticating functional section, a data transfer interface section can record/reproduce information with respect to the external transfer data storing section at an optimum timing according to the state of the transmission line. By temporarily storing obfuscated information transferred with respect to the exterior in the external transfer data storing section and independently forming obfuscated information according to the inherent clock provided in the interior, the adaptability at the time of protocol conversion and the flexibility for the busy condition of the external communication line can be enhanced.
Further, in this invention, by previously storing an area key and stream key in the authentication information storing section and using the information for the authentication process, it becomes unnecessary to use the third party such as an authentication station (CA center) or inquire of the third party and the mutual authentication operation can be extremely easily effected with high reliability.
Further, in this invention, since only a client (IP address or telephone number thereof) to or by whom information is distributed or collected and the content of the information to be distributed or collected are informed from the server and the other processes are left to the information reproducing apparatus, no load is imposed on the main CPU during the information transfer and the main CPU can effect the other process during the information transfer so that the high speed process can be attained as a whole system. Further, since information is input/output via the network communication between the computer and the information reproducing apparatus, the information reproducing apparatus can be placed at a far distance from the compute
Ando Hideo
Ishizawa Yoshiyuki
Kojima Tadashi
Nakagawa Masaki
Kabushiki Kaisha Toshiba
Peeso Thomas R.
Pillsbury & Winthrop LLP
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