The invention discloses an
intellectual property database searchable
encryption method supporting dynamic updating, and aims to solve the problems of
high index reconstruction overhead and low updating efficiency in a data addition scene in an existing scheme. The core of the method is to construct a layered and merged dynamic index structure: for newly added data, a
client generates an independent lightweight incremental index fragment (L0) and uploads the fragment, so that low-
delay updating is realized; and when the incremental index fragments are accumulated to a threshold value, triggering a background hierarchical merging mechanism to merge a plurality of low-level index fragments into high-level index fragments so as to maintain the retrieval efficiency. By storing the index entries in the
confusion bucket located by
trap door hash, the association between the index entries is
cut off, and the access mode privacy is enhanced. In the searching stage, the
server side performs intelligent filtering through a
bloom filter, the minimum target
ciphertext set is determined, and network transmission and
client side decryption expenses are greatly reduced. According to the method, the data
confidentiality and the retrieval privacy are ensured, and meanwhile, the
system performance in a dynamic environment is remarkably improved.