Research on PIR Technology Program

The PIR technology refers to the fact that the querying party can only get the characteristics of a query user ID, and the data-checked party does not know the user ID queried by the querying party. When the query target is the user feature, this paper is to improve the existing PIR implementation scheme and propose a high-performance PIR technical scheme. This scheme can also be called CFB-PIR. The protocol mainly adopts the consistent hash algorithm, the symmetric encryption of the national secret type, and the counting Bloom filter. Experiments show that when the query ID may be in the database, the running performance of the solution is only closely related to the preset user discrimination. It has little to do with the number of users in the database. Under the same experimental conditions set in the article, the article compares the performance of three PIR schemes and the CFB-PIR scheme. When the server database exceeds 100,000, the performance superiority of the CFB-PIR scheme is more obvious.