Digital data authentication method

• US 20020095579A1
• Filed: 02/25/2002
• Published: 07/18/2002
• Est. Priority Date: 06/05/1997
• Status: Abandoned Application

• Current Assignee: Hiroshi Yoshiura, Hisashi Toyoshima, Kazuo Takaragi, Ryoichi Sasaki, Seiichi Susaki, Tsukasa Saito
• Original Assignee: Hiroshi Yoshiura, Hisashi Toyoshima, Kazuo Takaragi, Ryoichi Sasaki, Seiichi Susaki, Tsukasa Saito
• Inventors: Yoshiura, Hiroshi, Saito, Tsukasa, Takaragi, Kazuo, Toyoshima, Hisashi, Susaki, Seiichi, Sasaki, Ryoichi
• Application Number:
  US10/081,216
• Publication Number:
  US 20020095579A1
• Time in Patent Office: Days
• US Class Current: 713/176
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06T 1/0021 Image watermarking
• CPC Class Codes: G06T 1/005 Robust watermarking, e.g. average attack or collusion attack resistant
• CPC Class Codes: G06T 2201/0063 in relation to collusion attacks, e.g. collusion attack resistant
• CPC Class Codes: G06T 2201/0081 whereby both original and watermarked images are required at decoder, e.g. destination-based, non-blind, non-oblivious
• CPC Class Codes: H04L 2209/56 Financial cryptography, e.g. electronic payment or e-cash
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 2463/103 applying security measure for protecting copy right protecting software against unauthorised usage in a vending or licensing environment, e.g. protection the software providers copyright G06F21/10; data processing systems or methods, specially adapted for payment schemes, architectures or protocols G06Q20/00; secrecy systems or subscription systems H04N7/16
• CPC Class Codes: H04L 63/0442 wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption cryptographic mechanisms or cryptographic arrangements for public-key encryption H04L9/30
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04L 63/12 Applying verification of the received information cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32
• CPC Class Codes: H04L 63/126 the source of the received data
• CPC Class Codes: H04L 9/08 Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords network architectures or network communication protocols for supporting key management in a packet data network H04L63/06
• CPC Class Codes: H04L 9/32 including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
• CPC Class Codes: H04L 9/3236 using cryptographic hash functions
• CPC Class Codes: H04L 9/3247 involving digital signatures
• CPC Class Codes: H04N 1/32144 embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
• CPC Class Codes: H04N 21/2541 Rights Management protecting software against unauthorised usage in a vending or licensing environment G06F21/10; security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/42684 Client identification by a unique number or address, e.g. serial number, MAC address, socket ID network arrangements, protocols or services for addressing or naming H04L61/00
• CPC Class Codes: H04N 21/44 Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
• CPC Class Codes: H04N 21/4622 : Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet web site content organization and management for information retrieval from the Internet G06F16/958; transmission by internet of broadcast information H04H60/82; stock exchange data over packet-switching network H04L12/1804; push services including data channel over packet-switching network H04L12/1859
• CPC Class Codes: H04N 21/4627 : Rights management associated to the content security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/63345 : by transmitting keys key distribution for secret or secure communication H04L9/08; network support of key management H04L63/06
• CPC Class Codes: H04N 21/835 : Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10
• CPC Class Codes: H04N 2201/323 : for tracing or tracking, e.g. forensic tracing of unauthorized copies
• CPC Class Codes: H04N 2201/3236 : Details of authentication information generation
• CPC Class Codes: H04N 7/163 : by receiver means only

Abstract

This invention provides a method for identifying a purchaser who purchased content from which an illegal copy was produced. A provider system encrypts a content purchased by the purchaser using a public key of a purchaser system and sends the encrypted content to the purchaser system. The purchaser system creates a digital signature of the content with the use of a private key of its own and embeds the created digital signature into the received content. When an illegal copy is found, the provider system verifies the digital signature, embedded in the illegal copy as a digital watermark, to identify the purchaser who purchased the content from which the illegal copy was produced.

Claims

1. A validity check system having an information browser device that displays electronic data, an information publisher device that stores electronic data in a state that said electronic data can be displayed in said information browser device, and a validity check unit that checks validity of said electronic data,

said validity check unit comprising:

a storing sub-unit which stores validity checkable information usable for checking validity of said electronic data stored in said information publisher device; and

a check sub-unit which checks the validity of electronic data which was requested from said information browser device to said information publisher device, by using said validity checkable information and transmits the check result to said information browser device.

2. A validity check system as claimed in claim 1, further comprising:

a control sub-unit which has display control of said information browser device of said electronic data according to the check result.

3. A validity check system as claimed in claim 2, wherein said control sub-unit further keeps said electronic data from being displayed on said information browser device after said check sub-unit detects a modification of said electronic data.

4. A validity check unit for checking validity of electronic data, comprising:

a storing sub-unit which stores validity checkable information usable for checking the validity of said electronic data stored in an information publisher device; and

a check sub-unit which checks validity of said electronic data which is requested from an information browser device to said information publisher device, by using said validity checkable information and transmits a check result to said information browser device.

5. A program product comprising computer readable program code which constructs, on a computer, a validity check unit which checks validity of electronic data, said validity check unit comprising:

a storing sub-unit which stores validity checkable information usable for checking validity of electronic data stored in an information publisher device; and

a check sub-unit which checks the validity of electronic data which was requested from an information browser device to said information publisher device, by using said validity checkable information, and transmits a check result to said information browser device.

6. A validity check method for checking validity of electronic data, comprising the steps of:

specifying information that is usable for checking validity of electric data which is requested from an information browser device to an information publisher device for checking validity of the requested electronic data, among validity checkable information usable for checking the validity of each electronic data stored in said information publisher device; and

checking the validity of said electronic data using the information specified, and transmitting a validity check result of said electronic data to the information browser device.

7. A validity check method as claimed in claim 6, further comprising the step of:

performing display control on said information browser device of said electronic data device according to the check result.

8. A validity check method as claimed in claim 7, wherein said step of controlling display further comprises the steps of:

keeping said electronic data from being displayed in the information browser device after a modification of said electronic data is detected.