The invention discloses a text lightweight
encryption method based on an improved Feistel structure, and belongs to the technical field of
information security. Due to the fact that a traditional
encryption method needs a large amount of
resource allocation, the
encryption and decryption speed is low, and the standards of
rapidity and real-time performance cannot be met, the text-oriented lightweight grouping encryption and decryption method is designed. The
S box with the nonlinearity of 110, the differential approximation probability of 0.0391 and the strict avalanche criterion correlation matrix average value of 0.5066 is generated and optimized by applying two
chaotic mappings. According to the method, a generalized Feistel structure is correspondingly improved, so that the improved structure can process all intermediate states at a time, and a text-oriented lightweight grouping encryption and decryption
algorithm is formed by combining an optimized
S box, a newly designed key expansion
algorithm, a P box and the like. The GE number of the
algorithm meets the lightweight standard, and the algorithm is tested, analyzed and compared to obtain better results, so that the algorithm is suitable for providing encryption and decryption functions for limited equipment.