Sony Corporation

Hiromi Matsuda

Masao Tanaka

Miki Abe

Takafumi Hosoi

Eiichiro Morinaga

Takayasu Kon

Eichiro Morinaga

Input data (plain text data or encrypted text data) are latched according to a clock CLKand, after initial transposition thereof, the data are outputted from a selector. The lower-order bits of the output data from the selector are processed through expanded transposition and then are calculated together with key data Kin an XOR circuit, and the result data are latched according to a clock CLKThe latched 48-bit data are divided into eight 6-bits data, each of which is then replaced with 4-bit data, and after combination thereof, the data are transposed. In the calculations of second and subsequent stages, the data obtained through replacement and combination in a replacement/combination circuit are latched according to the clock CLKand then are outputted from the selector. And after completion of the 16th-stage calculation, the data replaced in a replacement circuit are inversely transposed.

Arithmetic device and encryption/decryption device

A data transfer apparatus referred to as a primary-recording-medium apparatus implements proper system operations by acquisition of information on a secondary recording medium mounted on a secondary-recording-medium apparatus to serve as a destination of a transfer (or a check-out) of a content. If a medium adopting its own unique management technique as is the case with a mini disc is used as the secondary recording medium serving as a destination of a check-out, the primary-recording-medium apparatus acquires information on the secondary recording medium from the secondary-recording-medium apparatus, which is typically a data-recording apparatus. The information includes an indicator as to whether or not the secondary recording medium has been mounted on the data-recording apparatus, the name of the secondary recording medium, the name of each content stored in the secondary recording medium, the number of contents stored in the secondary recording medium and attributes of each content stored in the secondary recording medium.

Data transfer system, data transfer apparatus, data recording apparatus, data transfer method

Disclosed is a key generator, which assures the security of a key by preventing a circuit designer and other persons from readily knowing the value of the key. Random number generator circuits (and so on) generate random numbers respectively in accordance with different clocks (CLK, CLK, CLK, and so on). An arithmetic circuit () operates on the random numbers generated from the random number generator circuits (and so on) to generate an N-bit random number RA as the output from a random number generator (). This N-bit random number is RA acquired via a key selector (), and latched into a key register () in accordance with an acquisition enable signal EN from a timing monitoring counter (), which is driven by a clock CLKA other than clocks CLK, CLK, CLK, and so on, to obtain a hardware key, which is a unique secret key.

Key generator device, encoding/decoding device, and key generation method

An arithmetic unit and an arithmetic method that output no information necessary for decryption or encryption to the outside and can perform a self-protecting function when an illegal attack is made. A command monitoring part () monitors input command sequences. In a first sequence, a process key in a first stage is calculated from a hardware key (Khd) and is then written to a key storing part (). In each of the following sequences, a process key in a next stage is calculated from a process key stored in the key storing part (). When commands of predetermined contents are inputted in predetermined order, a content key is calculated and then written to the key storing part (). Encrypted data is decrypted with the content key, and the result is outputted from data output means (). When an illegal attack is made, initialization is performed by selecting fixed value data (Kf) as key data (Ksl) and selecting fixed value data (Df) as input data (Ein).

Calculation device and calculation method

The present invention provides a picture synthesizing apparatus comprising a first synthesis means for synthesizing base picture data with mix picture data to be synthesized with said base picture data; a single-color-picture generating means for generating a piece of single-color picture data or a plurality of pieces of single-color picture data; a select means for selecting one of said pieces of single-color picture data generated by said single-color-picture generating means to be used in fade processing of said base picture data and said mix picture data; and a second synthesis means for synthesizing an output of said first synthesis means with an output of said select means. Accordingly, the picture synthesizing apparatus of the present invention is capable of carrying out processing to synthesize a base picture and a mixing picture and fade processing in an integrated and coordinated manner as well as being capable of carrying out cross-fade processing in addition to single-color-fade processing.

Integrated fading and mixing for a picture processing apparatus

A data transfer system provided by the present invention is capable of executing proper management of content transfers with a high degree of efficiency. In a data transfer apparatus employing a primary recording medium, rights to transfer contents stored in a primary recording medium are managed, and transfer rights of contents already transferred to a secondary recording medium employed in a data-recording apparatus are managed by using a generated table for associating first content identifiers each generated by the data transfer apparatus for a content stored in the primary recording medium with a second content identifier received from the data-recording apparatus and generated by the data-recording apparatus for the content, which has already been transferred to the data-recording apparatus. Thus, even if the secondary recording medium cannot be used for recording a second content identifier (or a content ID), a content ID (a second content identifier) generated for a content can be used for identifying the content by associating the content ID (the second content identifier) with a content ID (a first content identifier) stored in the primary recording medium.

Data transfer system, data transfer apparatus, data-recording apparatus, data management method and identifier generation method

The present invention is intended to significantly reduce the content data processing and transfer times by skipping root key checking processing, when transmitting a plurality of pieces of encrypted content data stored in a primary recording medium to a secondary recording medium along with key information of these plural pieces of content data, if the key information for a piece of content data to be transmitted from the primary recording medium is the same as the key information for an already transmitted piece of content data.

Data recording apparatus, data recording method, and data transfer system

Disclosed is a method for causing either encrypted first content data or unencrypted second content data, to be selectively recorded to a storage medium in a data recording apparatus. When the data recording apparatus is to return the encrypted first content data to the data transfer apparatus, the return is inhibited if the data are judged to have been edited. Upon return of the encrypted first content data, a content ID held by the data recording apparatus regarding the first content data is matched against a content ID held by the data transfer apparatus regarding the received data. Where the encrypted first content data are known to have been edited, the content ID matching process is omitted.

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Kanagawa, Japan

Hiromi Matsuda