Patent · US Active

Encryption and decryption method and device based on bit permutation and bit transformation

US11750375B2 · kind B2 · utility

1Cited by

0References

20Claims

0Family size

Assignees

Zhuhai College of Science and Technology · CN
JILIN UNIVERSITY · CN

Inventors

Yujuan Si · Longbeilingcun, CN
Guanghui Feng · Longbeilingcun, CN
Liuqi Lang · Tangxia, CN
Xiaoyang Fu · Beijing, CN
Hao Wu · 红钢城街道, CN

Key dates

Filing date	Apr 19, 2019
Grant date	Sep 5, 2023
Priority date	—
Expiry date	Oct 21, 2039

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02D30/50
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

Disclosed are an encryption and decryption method and device based on bit permutation and bit transformation. The method includes: configuring a memory space, and preparing corresponding storage spaces for a plaintext file, a ciphertext file and a key file; changing a bit value of an initial key stream according to a bit operation rule, so as to obtain a bit-transformed key stream, changing a bit value of a plaintext according to the bit operation rule depending on the key stream; on the basis of a bit-transformed plaintext stream, according to a bit permutation rule depending on the key stream, performing a bit permutation operation on the bit-transformed plaintext stream, and randomly distributing the plaintext stream in a ciphertext stream, so as to obtain a target ciphertext and store the same as a file.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.