摘要:
According to one embodiment, a memory chip, which is connected to a controller that controls reading and writing of data in response to a request from an external device, includes: a memory including a special area that is a predetermined data storage area; a key storage unit that stores therein a second key that corresponds to a first key used by the external device to convert the data; a converting unit that receives, from the controller, data to be written into the special area and generates converted data by converting the data to be written using the second key; and a writing unit that writes the converted data into the special area.
摘要:
According to one embodiment, a communication device, which is connected to an external device, includes a key storage unit, an acquiring unit, a key selecting unit, and a calculating unit. The key storage unit stores therein a plurality of first information items obtained by twisting a plurality of device keys with first identification information for identifying the communication device. The acquiring unit acquires second identification information for identifying the external device. The key selecting unit selects one of the plurality of first information items using a media key block process. The calculating unit calculates a shared key, which is shared with the external device, using second information item obtained by twisting the selected first information item with the second identification information.
摘要:
According to an embodiment, a storage device connected to an external device includes a data storage, a key storage, a random number generating unit, a random number storage, a random number transmitting unit, a data receiving unit, a calculating unit, a determining unit, and a storage control unit. The data receiving unit receives write data to be written into the data storage and first authentication information. The key storage stores a key. The calculating unit calculates second authentication information for data generated from the write data and the random number by using the key. The determining unit determines whether the first authentication information and the second authentication information are identical. The storage control unit stores the write data into the data storage when the first authentication information and the second authentication information are determined to be identical.
摘要:
According to a data display method, data having a program unit and instruction data for the program unit multiplexed on bit stream data is received. The program unit is extracted from the received data and is stored in a memory. The instruction data is extracted from the received data, and the program unit or part thereof specified by the instruction data is read from the memory and is executed. Then, the bit stream data and the execution result are displayed. This ensures smooth synchronization of reproduction of a bit stream with execution of an associated program and efficient use of resources.
摘要:
According to an embodiment, an information-processing device is coupled to an external device and a server. The information-processing device includes a device key storage configured to store a device key; and an MKB processor configured to generate a media key from the device key and a media key block. The information-processing device also includes a shared key generator configured to generate a shared key from the media key and secret information transmitted from the server. The shared key is shared by the information-processing device and the external device.
摘要:
According to one embodiment, an image display apparatus includes a light-emitting source, a light modulation unit, a first control unit and a display. The light-emitting source emits a light beam. The light modulation unit is configured to modulate the light beam to generate data beams related to image data item displayed in a unit pixel region, and the unit pixel region includes at least one column of pixels defined by dividing all pixel region. The first control unit is configured to control beam paths of the data beams to guide the data beams to the unit pixel region. The display displays a parallax image by emitting the corresponding data beams from unit pixel regions of the all pixel region.
摘要:
In general, according to one embodiment, a storage device includes a data storage, a key storage, a receiver, an acquisition unit, a first computing unit, and a second computing unit. The data storage stores therein data. The key storage stores therein a plurality of device keys. The receiver receives identification information on an access device that accesses the data. The acquisition unit acquires an index specifying one of the device keys stored in the key storage. The first computing unit computes a second key based on the device key specified by the index and the identification information, the second key being used to perform an operation on key information acquired by performing an operation on a first key shared with the access device. The second computing unit computes the first key by performing an operation on the key information using the second key.
摘要:
According to one embodiment, a storage device includes a data storage unit, a receiving unit, a selecting unit, and an authenticating unit. The data storage unit includes a secret area that becomes readable when authentication has been made by using reading authentication information and that becomes writable when authentication has been made by using writing authentication information. The receiving unit receives an access request that is either a write request indicating that data should be written into the secret area or a read request indicating that data should be read from the secret area. The selecting unit selects the writing authentication information if the access request is the write request and selects the reading authentication information if the access request is the read request. The authenticating unit authenticates an access to the secret area by using one of the writing authentication information and the reading authentication information that has been selected.