FH/DS电台中跳频图案设计与跳频加密技术的研究

【作者】 卿朝进；

【导师】 周亮；

【作者基本信息】 电子科技大学 ， 密码学， 2006， 硕士

【摘要】 跳频通信以其抗干扰、抗衰落、抗截获、多址性能好等优点,在现代军事通信中得到了广泛的应用。作为跳频通信的三大关键技术之一,跳频序列(跳频图案)的产生对跳频通信的系统性能有着重大的影响,本文根据实际情况,设计出了多频段、多模式机载数字超短波FH/DS电台和软件无线数传电台所需的跳频图案。另外,军用电台需要高保密性,虽然跳频通信具有一定的保密性,但保密性相对较低。通过利用序列密码对跳频系统进行加密,可寻求到具有较好密码强度的跳频序列和更为安全的信息传输。本文利用混沌技术,通过对混沌映射的选取,选取出了易于实现,且性能优良的混沌映射;通过初始参数的加扰,使有限精度下混沌的短周期行为得以改善;通过利用混沌序列与m序列异或构成了混合混沌序列,在混合混沌序列的基础上构造出了双混沌系统,从而提高系统的抗破译能力,设计出了混沌序列密钥生成器。大量的对比分析试验表明,该密钥生成器生成的混沌序列密码的密码学特性良好。同时,本文还努力的寻求一种在有限精度条件下混沌加密的可实现方案,并利用混沌序列密码对跳频系统进行加密。一方面,本文利用混沌序列密码对跳频序列进行加密,仿真验证结果表明,电台系统的跳频序列的安全性能得到了一定程度的改善。另一方面,本文还对电台系统待传输信息进行加密,保证了在跳频图案被侦破的情况下,敌方也难以获知我方的通信信息。更多还原

【Abstract】 Possessing the strong ability of anti-jamming, anti-fading, anti-interception as well as the application of multiple access,frequency hopping(FH) communication is widely used in the modern military communication.As one of three essential technical factors of FH communication system,frequency hopping pattern plays great part in FH communication system.Based on practical applications,this thesis presents the FH patterns what FH/DS radio needs.For meeting the military radio needs,we encrypt the FH system with stream cipher to enhance it’s security.It is a good way to guarantee information safety and improve the properties of FH sequences .Fairly good chaos map,which is of high performance and be implement easily is selected.With the introducing of appropriate perturbation aimed to change the initial conditions ,we may enlarge the chaotic sequence period under finite precision in practical applications. Mixed chaotic model is constructed by combining Logistic sequences and m-sequences in form of exclusive-OR.And we ,by adding two mixed chaotic model,constructed double chaotic system to generate the key generator,which provides with excerllent cryptographic properties.Under finite precision ,ways we always seek is easy to implement.And we encrypt the FH system with chaotic stream cipher.Simulation results show that the security properties of FH sequence have been improved and the security of information is guaranteed even the FH patterns are broken.更多还原