Safe frequency hopping sequence construction method based on evolution codes

Abstract

The invention discloses a safe frequency hopping sequence construction method based on evolution codes. The method includes the following steps of synchronously changing carrier frequency through a group of pseudorandom sequences by communication receiving and sending sides to conduct information transferring, naming pseudo-code sequences which control carrier frequency hopping as frequency hopping sequences, adopting an evolution DES grouping encryption algorithm by the frequency hopping sequences, serving address codes of a user as encryption secret keys, conducting encrypting on TOD information of the user to obtain a ciphertext, selecting n codes from the encrypted ciphertext to serve as frequency hopping codes, and therefore, constructing the frequency hopping sequences. The frequency hopping sequences constructed by the method are superior to those of the existing technical scheme in uniformity, correlation and linear complexity. In the method, an evolution data encryption algorithm is introduced to conduct encryption operation to construct the frequency hopping sequences, so that the frequency hopping sequences are high in safety and hardly intercepted by an aggressor.

Description

technical field [0001] The invention relates to the field of a safe frequency hopping sequence construction method based on evolutionary cipher, and belongs to the field of wireless communication. Background technique [0002] With the development of wireless communication technology and the increasing demand for new services, the requirements for anti-jamming, anti-fading performance and anti-interception capabilities of wireless communication systems are getting higher and higher. Traditional communication methods can no longer meet the requirements of users. In other words, frequency hopping communication has the advantages of strong anti-interference, anti-fading ability, low probability of interception, and strong multi-access networking ability. It has been widely used in modern military communications and civilian mobile communications. The principle of frequency hopping communication is that the sending and receiving sides of the communication change the carrier freq...

AI Technical Summary

Problems solved by technology

The frequency hopping sequence design requires that the frequency hopping sequence can use as many frequencies as possible to make the frequency processing gain as large as possible; the frequency hopping sequence has good autocorrelation and Hu correlation performance, and good confidentiality performance; good anti-interference performance, and the number of occurrences of each value of the sequence Try to be as uniform as possible; the frequency hopping sequence should have greater linear complexity and randomness, so that the other party cannot predict the next frequency hopping point

[0004] At present, the main research directions of frequency hopping sequences at home and abroad are: constructing frequency hopping sequence families based on prime number sequences, constructing frequency hopping sequence families based on m sequences, constructing frequency hopping sequence families based on GMW sequences, constructing frequency hopping sequence families based on RS codes, constructing frequency hopping sequence families based on Bent sequence constructs frequency hopping sequence family, constructs frequency hopping sequence family based on p-element pseudo-random sequence, and constructs frequency hopping sequence family based on chaotic mapping sequence. Their common disadvantages are that they cannot satisfy the best Hamming correlation performance and large linear complexity at the same time. Degree requirements, low security

Due to the similarity between the confidentiality of frequency hopping and the confidentiality of cryptography, in 1981, the American National Standards Institute announced the Data Encryption Algorithm (DEA), which has been published in the American National Standard: its standard name is " Data Encryption Algorithm", the English name is "Data Encryption Algorithm" (standard number: ANSI X3.92-1981). Then some scholars proposed the construction method of frequency hopping sequence family based on 3DES, the construction method of safe frequency hopping sequence based on AES algorithm, etc., which are based on the block cipher algorithm to construct the frequency hopping sequence family, through the system clock information TOD Encryption such as (Time of Day) generates a frequency hopping sequence. The disadvantage is that the non-linear structure S-box in the block cipher has been announced, which has potential safety hazards and the security strength of the password is not high.

Images