A forward-backward secure encryption method with recoverable keyword masking
An encryption method and keyword technology, which are applied to secure communication devices and key distribution, can solve the problems of irrecoverable, occupied, and do not support recoverable keyword shielding, and achieve the effect of reducing storage space and ensuring backward security.
Active Publication Date: 2021-11-12
XIDIAN UNIV
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Problems solved by technology
The existing forward-backward privacy protection technology will occupy too much local storage space, and does not support recoverable keyword masking, so once it is deleted by a dynamic searchable encryption scheme that supports backward security, it cannot be recovered
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[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0027] The invention relates to one-way trapdoor permutation to realize forward security and keyword shielding. For example, for a keyword w 0 , including w 0 The file is ind 0 , ind 1 . When adding keywords / file pairs w / ind 2 When , the simple method of generating search tokens for each keyword / file pair can guarantee forward secrecy, but incurs high communication overhead. For example, when adding w / ind 2 , need to generate three different search tokens ST 0 , ST 1 and ST 2 , but this approach also leads to a waste of storage space, because the data owner needs to store all generated search tokens. In order to solve the above two problems, a one-way trapdoor permutation is used to generate an updated search token ST on the data owner side c+1 , thereby reducing storage and computation costs. During the search process, the cloud ser...
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A forward-backward secure encryption method with recoverable keyword masking through one-way trapdoor permutation to achieve forward security and recoverable keyword masking: Utilizing one-way trapdoor permutation to generate updated search tokens at the data owner's end ST c+1 , in the search process, the cloud server can arrange the public key and ST according to the trapdoor c+1 Transfer the search token from ST 0 derived to ST c , but in the absence of a key, it is impossible to c Calculate ST c+1 ;Backward security through punctureable encryption: use a pseudo-random function to generate a label for each index, and use punctureable encryption to re-encrypt the labeled index; when the keyword / file pair is deleted, the data owner The key encrypted by the public key will be punctured, and the cloud server will modify the corresponding tag. Therefore, the cloud server cannot decrypt the keyword / file pair. The present invention can reduce the occupation of local storage space while realizing functions.
Description
technical field [0001] The invention belongs to the field of data encryption, in particular to an encryption method with forward and backward security and recoverable keyword masking. Background technique [0002] A dynamically searchable symmetric encryption scheme is said to be forward secure (or forward private) if the update query does not reveal which previously stored keywords are involved in the keyword / document pair being updated. In particular, the cloud server has no way of knowing whether an updated document matches a previously queried keyword. A DSSE scheme is backward secure (or backward private) if whenever a keyword / document pair (w, ind) is added to the database and then deleted, subsequent search queries on w do not reveal that ind . The existing forward-backward privacy protection technology will occupy too much local storage space, and does not support recoverable keyword masking, so once it is deleted by a dynamic searchable encryption scheme that supp...
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IPC IPC(8): H04L29/06H04L9/32H04L9/08H04L29/08
CPCH04L9/0861H04L9/3213H04L63/0428H04L63/0807H04L67/1097
Inventor 李致君马建峰苗银宾李颖莹李佳忆
Owner XIDIAN UNIV