为保证保密信息安全传输所设计的设备目前在军用和商用领域都已设置了。但是,最近的技术变革使得我们能够研制和实现新的加密技术,这不但能增加设备的运算速度和设备的可靠性,而且也极大地减少了设备的体积、重量和成本。据予测,在不太久的将来几万部加密设备将配备给军方作战术使用。就电子学和加密处理能力而论,尽管技术发展到什么程度似乎不受限制,但是在密码学中有一个引起系统设计人员关注的学科——密钥管理,这对于加密设备的许多用户来说也许是很重要的问题。加密系统的密钥类似于保险柜的组合号码锁的组合数。与用来打开普通锁的钥 Devices designed to ensure the safe transfer of confidential information are currently in place in the military and commercial arena. However, recent technological changes have allowed us to develop and implement new encryption technologies that will not only increase device speed and device reliability, but also dramatically reduce the size, weight, and cost of the device. It is estimated that in the near future tens of thousands of encryption devices will be equipped to the military for tactical use. In terms of electronics and cryptographic capabilities, although there seems to be no limit to the extent to which technology is evolving, there is a discipline in cryptography that draws the attention of system designers-key management, to many users of cryptographic devices May be a very important issue. The key of the encryption system is similar to the combination number of the combination lock in the safe. With the key used to open a normal lock