Encryption and decryption communication semiconductor device and recording/reproducing apparatus

• US 7,290,148 B2
• Filed: 01/29/2003
• Issued: 10/30/2007
• Est. Priority Date: 02/21/2002
• Status: Expired due to Fees

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Technology Corporation (Renesas Electronics Corporation)
• Inventors: Nogami, Hiroshi, Shibayama, Tetsuya, Fujio, Hiroshi, Kataoka, Tomohiro, Tozawa, Jun
• Primary Examiner(s): Zand; Kambiz
• Assistant Examiner(s): SZYMANSKI, THOMAS M
• Application Number:
  US10/352,876
• Publication Number:
  US 20030159062A1
• Time in Patent Office: 1,735 Days
• Field of Search: None
• US Class Current: 713/189
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00246 wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder
• CPC Class Codes: G11B 20/00413 wherein the key is input by a user
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

Disclosed herein is an encryption and decryption communication semiconductor device comprising at least, a communication interface for performing a transfer of data according to a predetermined communication system, one or two or more encryption/decryption circuits which encrypt or decrypt input data in accordance with a predetermined algorithm, and a plurality of external interfaces for performing the input/output of data from and to external devices. The communication interface, the encryption/decryption circuits and the plurality of external interfaces are formed on one semiconductor chip. In the cryption and decryption communication semiconductor device, input data sent from any one of the plurality of external interfaces is encrypted or decrypted by at least one of the encryption/decryption circuits and is capable of being outputted to any different one of the plurality of external interfaces.

Claims

1. An encryption and decryption communication semiconductor device, comprising:

a link circuit which performs a process based on specs of a LINK layer of an IEEE1394 standard;

a communication circuit provided between the link circuit and an external terminal to which a communication medium is connected, and which performs transmission/reception of isochronous data to and from an external device via the communication medium;

a packet processing circuit which generates a transmit packet of a predetermined format containing transmit data and extracts received data included in a received packet;

an encryption/decryption device which performs encryption and decryption of isochronous data; and

a plurality of interfaces, each of which enables a connection to a corresponding external device for recording or reproducing the isochronous data, and which can perform input/output of isochronous data from and to the link circuit via the encryption/decryption device and from and to the corresponding external device; and

wherein the plurality of interfaces include a first interface enabling a connection to a device for reproducing isochronous data and a second interface enabling a connection to a device for recording isochronous data, and

the encryption/decryption device encrypts data inputted from the first interface and outputs the encrypted data to the second interface, and decrypts data inputted from the second interface and outputs the decrypted data to the first interface.

2. The recording/reproducing apparatus according to claim 1, wherein the isochronous data includes video data.