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  Method and apparatus for encrypting and decrypting informationUSPTO Application #: 20070291943Title: Method and apparatus for encrypting and decrypting information Abstract: An encryption key is generated in response to a plurality of information pieces being bases for the encryption key. Original information is encrypted into encryption-resultant information in response to the generated encryption key. The encryption-resultant information is divided into units. Each of the units is loaded with encryption control information for identifying the plurality of information pieces being the bases for the encryption key. (end of abstract) Agent: Louis Woo Law Office Of Louis Woo - Alexandria, VA, US Inventors: Takayuki Sugahara, Wataru Inoha, Seiji Higurashi, Toshio Kuroiwa, Kenjiro Ueda USPTO Applicaton #: 20070291943 - Class: 380217000 (USPTO) Related Patent Categories: Cryptography, Video Cryptography, Video Electric Signal Modification (e.g., Scrambling), Image Data Converted To Digital Before Modification, Having Compression (e.g., Mpeg) The Patent Description & Claims data below is from USPTO Patent Application 20070291943. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a method of encrypting information, a method of decrypting information, an apparatus for encrypting information, and an apparatus for decrypting information. Furthermore, this invention relates to an information recording medium. [0003] 2. Description of the Related Art [0004] Japanese patent application publication number 10-269289/1998 discloses a system for managing the distribution of digital contents. In the system of Japanese application 10-269289, a distributor side encrypts and compresses digital contents into processing-resultant digital contents. The distributor side transmits the processing-resultant digital contents, an encryption-resultant contents key, and encryption-resultant accounting information to a communication opposite party. The distributor side implements a process of receiving a charge on the basis of contents use information transmitted from the communication opposite party. Then, the distributor side implements a process of dividing the received charge among interested persons including a copyright holder of the digital contents. On the other hand, a user side (a digital contents player) decrypts and expands the processing-resultant digital contents in response to the contents key, thereby reproducing the original digital contents. The user side subjects the accounting information to a reducing process responsive to the use of the digital contents. The user side transmits the reduced accounting information and the contents use information to the distributor side. [0005] In the system of Japanese application 10-269289, a third person can illegally reproduce the original digital contents when getting the original contents key. [0006] Japanese patent application publication number 10-283268/1998 discloses a system in which a recording medium stores encryption-resultant main information, and also encryption-resultant information representing a key for decrypting the encryption-resultant main information. Non-encrypted information representing conditions of decrypting the encryption-resultant main information is added to the encryption-resultant key information. In more detail, the encryption-resultant key information has non-encrypted control information which contains device information and region information. The control information is designed to prevent the encryption-resultant main information from being copied onto a magnetic recording medium or an optical disc in a user side for illegal use thereof. [0007] The system of Japanese application 10-283268 has a problem as follows. The non-encrypted control information in the encryption-resultant key information can easily be altered by a third person. The alteration of the non-encrypted control information enables the third person to illegally copy the encryption-resultant main information. [0008] Japanese patent application publication number 7-140896/1995 discloses first and second systems each for encrypting an ordinary text file. In the first system of Japanese application 7-140896, the ordinary text file is divided into ordinary text blocks each having the smallest limit of a data size range in which data can be transmitted between a disk buffer and an on-memory data area used by an application program. The ordinary text blocks are encrypted into encryption-resultant text blocks in response to a user key. The encryption-resultant text blocks are connected to form an encryption-resultant text file. [0009] In the second system of Japanese application 7-140896, the ordinary text file is divided into ordinary text blocks each having the smallest limit of a data size range in which data can be transmitted between a disk buffer and an on-memory data area used by an application program. Data keys are generated from a user key and values peculiar to the respective ordinary text blocks. The total number of data keys is equal to that of the ordinary text blocks. The values of the offsets of the ordinary text blocks from the head of the ordinary text file are used as the peculiar values, respectively. The ordinary text blocks are encrypted into encryption-resultant text blocks in response to the data keys, respectively. The encryption-resultant text blocks are connected to form an encryption-resultant text file. [0010] The first and second systems of Japanese application 7-140896 tend to be insufficient in security. SUMMARY OF THE INVENTION [0011] It is a first object of this invention to provide a method of encrypting information which is improved in security. [0012] It is a second object of this invention to provide a method of decrypting information which is improved in security. [0013] It is a third object of this invention to provide an apparatus for encrypting information which is improved in security. [0014] It is a fourth object of this invention to provide an apparatus for decrypting information which is improved in security. [0015] It is a fifth object of this invention to provide an information recording medium improved in security. [0016] A first aspect of this invention provides a method comprising the steps of generating an encryption key in response to a plurality of information pieces being bases for the encryption key; encrypting original information into encryption-resultant information in response to the generated encryption key; dividing the encryption-resultant information into units; and loading each of the units with encryption control information for identifying the plurality of information pieces being the bases for the encryption key. [0017] A second aspect of this invention provides a method comprising the steps of detecting encryption control information in each of units composing encryption-resultant information, the encryption control information being for identifying a plurality of information pieces being bases for an encryption key; identifying the plurality of information pieces being the bases for the encryption key in response to the detected encryption control information; generating the encryption key from the identified plurality of information pieces being the bases for the encryption key; and decrypting each of the units composing the encryption-resultant information into a unit of original information in response to the generated encryption key. [0018] A third aspect of this invention provides an information encrypting apparatus comprising first means for generating an encryption key in response to a plurality of information pieces being bases for the encryption key; second means for encrypting original information into encryption-resultant information in response to the encryption key generated by the first means; third means for dividing the encryption-resultant information generated by the second means into units; and fourth means for loading each of the units with encryption control information for identifying the plurality of information pieces being the bases for the encryption key. [0019] A fourth aspect of this invention provides an information decrypting apparatus comprising first means for detecting encryption control information in each of units composing encryption-resultant information, the encryption control information being for identifying a plurality of information pieces being bases for an encryption key; second means for identifying the plurality of information pieces being the bases for the encryption key in response to the encryption control information detected by the first means; third means for generating the encryption key from the identified plurality of information pieces being the bases for the encryption key; and fourth means decrypting each of the units composing the encryption-resultant information into a unit of original information in response to the encryption key generated by the third means. [0020] A fifth aspect of this invention provides an information recording medium which stores encryption-resultant information divided into units, wherein each of the units contains encryption control information for identifying a plurality of information pieces to generate an encryption key. [0021] A sixth aspect of this invention provides a method comprising the steps of dividing original information into original-information units; generating an encryption key in response to a plurality of information pieces being bases for the encryption key; encrypting each of the original-information units into an encryption-resultant information unit in response to the generated encryption key; and loading the encryption-resultant information unit with encryption control information for identifying the plurality of information pieces being the bases for the encryption key. [0022] A seventh aspect of this invention provides an information encrypting apparatus comprising first means for dividing original information into original-information units; second means for generating an encryption key in response to a plurality of information pieces being bases for the encryption key; third means for encrypting each of the original-information units generated by the first means into an encryption-resultant information unit in response to the encryption key generated by the second means; and fourth means for loading the encryption-resultant information unit generated by the third means with encryption control information for identifying the plurality of information pieces being the bases for the encryption key. Continue reading... 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