摘要
随着网络普及和带宽提升,网络语音传输已成为现实,但网络的开放性也给语音安全带来了巨大威胁。数据加密常被用来保证网络语音通信的安全,混沌序列的宽频谱、类随机、参数敏感等特点使其非常适合作为加解密密钥。为避免长时间使用固定混沌序列作为密钥带来的安全隐患,设计并实现了一种用于VoIP的动态混沌加解密方案,利用混沌密钥动态交换机制实现收发端混沌根密钥交换,由根密钥通过Henon映射、改进的Logistic映射及非线性置换随机生成混沌密钥,接收端根据接收到的根密钥先生成解密密钥,然后对语音密文进行解密。测试结果表明,该动态混沌加解密系统具有良好的保密效果,可用于网络语音保密通信中。
VoIP has become reality with spread of the network and its increasing bandwidthbut the speech is exposed to danger for the openness of network.Data encryption is usually used to ensure the safety of speech communication and chao-tic sequence is very suitable as the decryption cipher for its wide spectrum random ness,sensitiv to initial parameters.In order to avoid the danger come from using fixed chaos sequence as the cipher for long timea VoIP dynamic chaotic encryption scheme was designed and implemented,in which Henon mapimproved Logistic map and a nonlinear map are combined to update chaotic cipher randomlyand the receiver decrypts data using the dynamic chaotic cipher obtained through the dynamic cipher exchange system.Experiment results show that this dynamic chaotic encryption system has high security and can be used for secure speech transmission.
出处
《计算机科学》
CSCD
北大核心
2014年第B11期268-271,共4页
Computer Science
基金
江苏高校优势学科项目
船舶工业国防科技预研项目(10J3.5.2)资助
关键词
加解密
网络语音传输
混沌密钥
动态密钥
Encryption and decryption
VoIP
Chaotic cipher
Dynamic cipher
