Patent
Image data encryption method and apparatus, computer program, and computer-readable storage medium
Keiichi Iwamura,Yuji Suga,Junichi Hayashi +2 more
- 05 Mar 2004
17
TL;DR: In this article, the authors proposed an image data encryption technique which facilitates management of access keys in encrypting image data having a hierarchical structure in which the data of each layer can be specified by at least two parameters, and is resistant against exchange of access key between a plurality of users.
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Abstract: This invention provides an image data encryption technique which facilitates management of access keys in encrypting image data having a hierarchical structure in which the data of each layer can be specified by at least two parameters, and is resistant against exchange of access keys between a plurality of users. To implement this technique, in this invention, in encrypting image data having a hierarchical structure in which a layer is specified by layer and resolution levels, an access key K for the highest resolution and highest layer is set. Access keys are generated by using a one-way function in a direction which the level becomes low. The access key for a given layer can be generated from either of the access keys of layer and resolution located at the higher level. The data of each layer is encrypted in accordance with a corresponding access key.
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Citations
Patent
Digital rights management scheme for an on-demand distributed streaming system
TL;DR: In this article, the authors proposed a hierarchical DRM scheme, where each packet of the media is associated with a different protection level, and the decryption key of a lower protection layer is the hash of the decrypt key at the higher protection level.
69
Patent
Key information processing method, device thereof, and program
Yuji Suga,Junichi Hayashi +1 more
- 11 Jan 2006
TL;DR: In this article, the authors present a key management method with an access structure equivalent to the hierarchical key management with a small amount of calculations, which includes a setting step for setting a set (,) of the number of times a one-way hash function is executed for each of the elements of the rank i; a key generation step for generating two separate keys for the elements as the value of the times the oneway function has been executed corresponding to the set of the original keys for each element; and a key delivery step for delivering the two separate key for the element to each
19
Patent
Providing access to a data item using access graphs
Alexey Orlov,Dmitry Starostin +1 more
- 01 Apr 2010
TL;DR: In this paper, the authors describe an approach for controlling access to a data item using one or more access graphs by distributing a compact package of access-related information to a recipient that pertains to the access graphs.
17
Patent
Encryption key generation device
Yoichi Hata,Toshiaki Kakii,Fujita Yasuhito,Yoshimitsu Goto,Hitoshi Kiya,Kiyoshi Nishikawa,Masaaki Fujiyoshi,Shoko Imaizumi +7 more
- 28 Oct 2011
TL;DR: In this paper, a matrix generating unit generates key element matrices (M 1 -M 3 ) with respect to each of split keys (e R2, e R1, e R3 ) obtained by a key dividing unit dividing the master key (K 2,2 ).
13
Patent
Information processing method, information processing apparatus, program, and storage medium
Junichi Canon Kabushiki Kaisha Hayashi
- 24 Jun 2003
TL;DR: In this article, a bitstream of each tile in a code sequence is segmented into bitstreams for respective resolution levels, and the corresponding bitstream keys corresponding to the segmented bitsstreams indicating respective resolutions in tile Ti are generated.
12
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Keiichi Iwamura
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TL;DR: In this paper, an electronic watermark method, used for a network, comprising a plurality of entities, is presented. But the method is not suitable for the secure transmission of encrypted data.
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Patent
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TL;DR: In this paper, the authors proposed a method for determining the direction of rotation applied to an image and extracting digital watermark information correctly even in the case where a registration signal having a symmetric axis is embedded.
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Patent
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Shuichi Ohtsuka
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