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Method of revoking public key of content privider

A public key and content technology, applied in the field of public key of content providers, can solve unreasonable problems and achieve the effect of preventing forgery or change

Inactive Publication Date: 2007-11-14
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the content provider CP is withdrawn only for commercial reasons, it is unreasonable to prevent the user device UD from using the first content Cont_1 sent from the content provider CP to the user device UD before the time t1 when the content provider CP is withdrawn

Method used

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  • Method of revoking public key of content privider
  • Method of revoking public key of content privider
  • Method of revoking public key of content privider

Examples

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Embodiment Construction

[0038] In a system in which a certificate authority authenticates a content provider's public key, and the content provider transmits predetermined content to a user device using the authenticated public key, the method includes: generating the signature of the public key by comparing time and the time when the public key is revoked, the user device determines whether the predetermined content is revoked. Thus, it is possible to allow the user device to identify content that must not be revoked based on the timing of revoking the public key and the revocation list including the exception list, thus preventing legitimately obtained content from being revoked.

[0039] The present invention introduces two methods to prevent improper revocation of content authorization. In a first method, a revocation list is generated to include information about the moment at which content authorization was revoked. In a second approach, the revocation list includes content identifiers identif...

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Abstract

A method of revoking a public key of a content provider is provided. In a system in which a certificate authority certifies the public key of the content provider and the content provider transmits predetermined content to a user device using the certified public key, the method includes the user device determining whether the predetermined content is revoked by comparing a time when a signature of the public key is generated with a time when the public key is revoked. Accordingly, it is possible to allow the user device to identify content that must not be revoked according to the time when the public key is revoked and a revocation list which includes an exception list, thereby preventing rightly obtained content from being revoked.

Description

technical field [0001] The present invention relates to a method of revoking content authorization using a revocation list, and more particularly, to a method of revoking a content provider's public key in a system in which an authentication authority has access to the content provider's public key Authentication is performed, and the content provider sends the content to the user using the authenticated public key. Background technique [0002] Content is provided from a content producer to a content provider, and the content provider transmits the content to a user device. For example, a content producer is a studio, and a content provider is an Internet business company or a disc manufacturing company that changes content into mass media files and distributes them to user devices. [0003] The user device is designed to determine whether the content provider is an authorized content provider, and reproduce the content after determining that the content provider is an aut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/32
CPCH04L9/0891H04L9/3268H04L2209/60H04L9/32
Inventor 金治宪刘容国南秀铉
Owner SAMSUNG ELECTRONICS CO LTD
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