Content grading access control system and method

Abstract

This invention discloses a content hierarchy access control system and a method, in which, said system includes an issuance sub-system and a use sub-system and said issuance sub-system generates levelcryptographic keys progressively and uses all the level keys to cipher data recordings progressively to issue them to the usage sub-system, the content issuance sub-system sets the control and levelcryptographic keys based on the user limitation information and issues said keys to the usage sub-system, which judges if the received key has the control key, if so, it uses all its generated level keys to de-cipher the data recording progressively, otherwise, it uses said level keys to de-cipher the data recording.

Description

technical field [0001] The invention relates to information management technology, in particular to a content hierarchical access control system and method. Background technique [0002] The rapid development of communication networks makes the transmission and distribution of information data more and more convenient. Consequently, the protection requirements for the security of important and high-value digital information content are getting higher and higher. The so-called security protection refers to encrypting data content to ensure its transmission security, or when a data record allows multiple users, setting access permissions for the above-mentioned users, so that when different users view the same data record, You can only get the content within the scope of your own permissions. [0003] In response to this security protection requirement, Intel proposed a patent on multi-dimensional content protection, which divides data records into levels and sets different ...

AI Technical Summary

Problems solved by technology

However, this method is only suitable for scenarios with strict level definitions, that is, users who obtain high-level keys must be able to decrypt low-level content, so the application is relatively limited

For data content that does not need to reflect the level, this method cannot give the user the corresponding access rights as required, that is, it cannot reflect the non-level relationship required by the system, so the flexibility is poor

[0004] In addition, this method cannot control the use of the key set. Once the user has the key set of a certain data record, he can arbitrarily transmit and copy the content of the record without restriction.

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