A hierarchical key generation method and system supporting searchable transparent encryption

Abstract

The invention provides a method and system for generating hierarchical keys that support searchable encryption. The method uses multi-layer keys, the first layer is the root key K; the second layer is the main key for encrypting index and query keywords. The key KM1, the master key KM2 for encrypting the document directory, the master key KM3 for encrypting the document authority, and the master key KM4 for encrypting the document; the third layer is the secondary key, including index and query keyword public Key KI and private key SK, document directory key KD, document authority public key KA and private key ASK, document key KF; the fourth layer is the working key, including index and query keyword working key set {KIW1,… ,KIWn1} and trapdoor keys {QW1,...,QWn2}, directory work key set {KDW1,...,KDWn3}, document authority work keys {KAW1,...,KAWn} and trapdoor keys {QAW1,... ,QAWn}, the document encryption work key set {KFW1,…,KFWn}; the fifth layer is the file fragmentation encryption key set {KFSi1,…,KFSin4}. The invention adopts multi-layer keys and can effectively resist opponent's attack.

Description

technical field [0001] The invention belongs to the field of computer information security, and in particular relates to a method and system for generating hierarchical keys supporting searchable transparent encryption. Background technique [0002] With the development of information technology, the number of electronic documents has increased dramatically and will continue to increase. Cloud storage is the solution to the big data storage problem of electronic documents. However, the cloud server is an untrusted third party, and data and privacy leaks often occur. In order to solve the security problem of cloud storage, it is necessary to provide non-third-party encryption services for electronic documents stored on the cloud server. However, in the context of big data, the encryption of electronic documents on the cloud server will cause difficulties in use. When electronic documents need to be retrieved, they need to be downloaded to the client for decryption, which lea...

AI Technical Summary

Problems solved by technology

[0005] But the key method above does not address how multi-level or multi-level key generation or management can be done with multi-searchable and transparent encryption

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