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AssigneeSony Corporation
InventorsTomoyuki Asano, Yoshitomo Osawa, Ryuji Ishiguro, Atsushi Mitsuzawa, Tateo Oishi
Estimating the term…
An information recording or reproducing device in which key distribution is effected by KRB distribution as a key distributing configuration of a tree structure. In this information recording or reproducing device, a key, such as a master key, a media key or a content key, is transmitted along with the KRB (key renewal block) by the key distributing configuration of the tree structure. After a given recording and/or reproducing device has acquired a key of a given recording medium on calculations, based on the KRB as received, the so acquired key is encrypted with a cipher key unique to the recording or reproducing device, such as a leaf key, so as to be then stored in a recording medium or in a memory of the recording or reproducing device. Thus, when the recording and/or reproducing device next uses the recording medium or the content, the recording or reproducing device is able to calculate the key on decrypting the cipher key only once. So, the volume of processing such as KRB decrypting processing needed when the recording and/or reproducing device accesses a recording medium or uses the content may be diminished to improve the efficiency in the processing on the KRB receipt side.
An information processing device for processing encrypted data, comprising:
The information processing device according to clain 1 wherein said encryption processing means stores said decrypting key, encrypted using the key unique to the information processing device, in association with the identification information unique to said information processing device.
The information processing device according to claim I wherein said decrypting key is a key allocated to said recording medium and is a media key used for decrypting encrypted data.
An information processing device for processing encrypted data, comprising:
An information processing device for processing encrypted data, comprising:
An information processing device for processing encrypted data, comprising:
An information processing method used in an information processing device, there being a node key unique to each of a plurality of nodes forming a hierarchical tree structure having a plurality of such information processing devices operating as leaves, and a leaf key unique to each of said information processing devices, comprising:
An information processing method used in an information processing device adapted for processing encrypted data, there being a node key unique to each of a plurality of nodes forming a hierarchical tree structure having a plurality of such information processing devices, operating as leaves, and a leaf key unique to each of said information processing devices, said method comprising:
An information processing method used in an information processing device adapted for processing encrypted data, there being a node key unique to each of a plurality of nodes forming a hierarchical tree structure having a plurality of such information processing devices operating as leaves, and a leaf key unique to each of said information processing devices, said method comprising:
An information processing method used in an information processing device adapted for processing encrypted data, there being a node key unique to each of a plurality of nodes forming a hierarchical tree structure having a plurality of such information processing devices, operating as leaves, and a leaf key unique to each of said information processing devices, said method comprising:
A computer program executed on an information processing device having a node key unique to each of a plurality of nodes forming a hierarchical tree structure having a plurality of such information processing devices, operating as leaves, and a leaf key unique to each of said information processing devices, said computer program comprising the steps of:
A computer program executed on an information processing device for processing encrypted data, there being a node key unique to each of a plurality of nodes forming a hierarchical tree structure having a plurality of such information processing devices, operating as leaves, and a leaf key unique to each of said information processing devices, said program comprising the steps of:
A computer program executed on an information processing device for processing encrypted data, there being a node key unique to each of a plurality of nodes forming a hierarchical tree structure having a plurality of such information processing devices, operating as leaves, and a leaf key unique to each of said information processing devices, said computer program comprising the steps of:
A computer program executed on an information processing device, there being a node key unique to each of a plurality of nodes forming a hierarchical tree structure having a plurality of such information processing devices as leaves, and a leaf key unique to each of said information processing devices, said program comprising the steps of:
An information recording medium in which the recorded information can be read out by an information processing device, wherein a decrypting key used for decrypting encrypted data, said decrypting key having been encrypted by a key unique to said information processing device, is recorded as a key storage table in association with the identification information for said information processing device.
Dependencies are inferred from the claim text.