Reserved format encryption method based on stream cipher

Abstract

The invention discloses a reserved format encryption method based on a stream cipher. The reserved format encryption method comprises: segmenting a telephone number, constructing a mapping rule, and establishing a region number replacement table for the first three region numbers, so as to complete encryption of the first three region numbers and guarantee the legality of an encryption result; forthe last eight telephone numbers, carrying out XOR operation on the last eight telephone numbers by utilizing a key stream generated by a ZUC (Zu Chongzhi) algorithm, realizing conformal encryption by combining modular operation, and introduces a Lagrange interpolation formula, so as to guarantee the correctness of encryption and decryption. According to the reserved format encryption method, theconsistency and legality of formats before and after data encryption are safely and effectively realized, and the statistical characteristics of plaintexts are well hidden, so that the data is protected in the transmission process under the condition that the format is not changed.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a format-preserving encryption method based on a stream cipher. Background technique [0002] In the era of big data and cloud computing, while many APP software and social software used in our life bring us convenience, they also collect our data information all the time. These data include many personal sensitive data, especially phone numbers. Sensitive data that will inevitably be collected has high value and is easy to be stolen and used by criminals. Once stolen, it is likely to cause property loss or life troubles, such as winning text messages, assisting the police in investigating cases, and pretending to be others In the form of urgent money transfer, etc., the target object will transfer the funds to the designated account, so as to achieve the purpose of defrauding and obtaining huge profits. In September 2019, Facebook's database of hundreds of millions...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a format-preserving encryption method based on a stream cipher, which can make the telephone number still maintain the characteristics of the original data format after encryption, and is a legal telephone number, which can solve the problem that traditional encryption techniques will cause The length and type of ciphertext change, which reduces data availability and affects database structure and business system functions, etc.

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