华南理工大学学报(自然科学版) ›› 2005, Vol. 33 ›› Issue (2): 60-64.

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一种话音保密系统的算法与实现

黄宏昌1 曾锦明2   

  1. 1.华南理工大学 计算机应用工程研究所,广东 广州 510640;2.澳门科技大学 资讯科技学院,澳门
  • 收稿日期:2003-07-01 出版日期:2005-02-25 发布日期:2005-02-25
  • 通信作者: 黄宏昌(1975-),男,硕士,主要从事密码学与通讯方面的研究 E-mail:biggua@vip.sina.com
  • 作者简介:黄宏昌(1975-),男,硕士,主要从事密码学与通讯方面的研究

Algorithm and Implem entation of a Secure Speech Communication System

Huang Hong-chang1  Chang Kam-meng2   

  1. 1.Research Institute of Computer Application,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China;2.Information Tech.college,Macao Univ.of Science and Tech.,Macao,China
  • Received:2003-07-01 Online:2005-02-25 Published:2005-02-25
  • Contact: 黄宏昌(1975-),男,硕士,主要从事密码学与通讯方面的研究 E-mail:biggua@vip.sina.com
  • About author:黄宏昌(1975-),男,硕士,主要从事密码学与通讯方面的研究

摘要: 针对通话在电话网被窃听的问题,设计了一种具高安全性的话音保密系统.该系统采用一种新的256比特分组密码算法——Must2和伪随机数产生器算法——Must—Rnd,并采用高安全性的会话密钥传送方法,把由Must—Rnd产生的会话密钥传送到被叫的电话终端,供Must2在通话时作实时加密及解密之用.将该系统在TMS320VC5402数字信号处理器(DSP)上予以实现,通话质量良好.

关键词: 语音保密系统, 算法, 分组密码, 公钥密码, 会话密钥, 伪随机数产生器, 数字密码器

Abstract:

A speech communication system with high security was designed to overcome the trouble of eavesdropping. In this system ,a new 256-bit block cipher-Must 2 and a pseudorandom number generator-Must-Rnd as well as a high-security public key cryptosystem for a session key are employed.Thus,the session key caused by Must-Rnd is transmitted to the far end of the telephone for the real-time speech encryption and decryption by Must2.The proposed system is finally implemented on the TMS320VC5402 Digital Signal Processor(DSP)with good audio quality.

Key words: secure speech communication system, algorithm , block cipher, public key cipher, session key, pseudorandom number generator, digital scrambler