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公开(公告)号:US5161189A
公开(公告)日:1992-11-03
申请号:US667151
申请日:1991-03-11
CPC分类号: H04L9/12 , H04L9/083 , H04L9/0891 , H04L2209/80
摘要: A single sync field (501) and multiple messages or message segments (503, 507, 511, and 515) are chained (407) together and encrypted (407) as a whole. When this encrypted chained message is received, it is decrypted as a whole (605), or in part (613) by setting up (609) and filling (611) a holding register with the encryption state of the encrypting device.
摘要翻译: 作为整体,单个同步字段(501)和多个消息或消息段(503,507,511和515)被链接(407)在一起并加密(407)。 当接收到加密的链接消息时,通过设置(609)并填充(611)具有加密设备的加密状态的保持寄存器,将其作为整体(605)或部分(613)进行解密。
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公开(公告)号:US4893308A
公开(公告)日:1990-01-09
申请号:US903315
申请日:1986-09-03
摘要: Disclosed is a method and apparatus for time companding a digital voice signal wherein, single bits are periodically removed from the digital voice signal, which is then compressed thereby forming a contiguous area of removed bits. A synchronization signal is inserted into this area and the combined signal is transmitted. At the receiver, the synchronization signal is extracted and is used to synchronize the receiver. The digital voice signal is then expanded and the removed bits are predicted and replaced.
摘要翻译: 公开了一种用于时间压缩数字语音信号的方法和装置,其中从数字语音信号周期性地移除单个比特,然后将其压缩,从而形成连续的去除比特的区域。 将同步信号插入该区域,并传送组合信号。 在接收机处,提取同步信号并用于同步接收机。 然后数字语音信号被扩展,并且去除的位被预测和替换。
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公开(公告)号:US4893339A
公开(公告)日:1990-01-09
申请号:US903360
申请日:1986-09-30
申请人: Michael W. Bright , Eric F. Ziolko , Alan L. Wilson , Michelle M. Bray , Harry A. Hennen , David L. Weiss
发明人: Michael W. Bright , Eric F. Ziolko , Alan L. Wilson , Michelle M. Bray , Harry A. Hennen , David L. Weiss
CPC分类号: H04L9/12 , H04K1/02 , H04L9/0656 , H04L2209/34
摘要: Disclosed is a synchronous secure communication system wherein an information signal is encrypted in an encryption means. The encrypted signal is compressed to allow the insertion of a synchronization signal, and the combined signals are transmitted. At the receiver, the synchronization signal is extracted and used to synchronize the receiver to the incoming data stream thereby improving receiver sensitivity and range.
摘要翻译: 公开了一种同步安全通信系统,其中信息信号在加密装置中被加密。 加密信号被压缩以允许插入同步信号,并且传输组合的信号。 在接收机处,同步信号被提取并用于使接收机与输入数据流同步,从而提高接收机的灵敏度和范围。
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公开(公告)号:US5412722A
公开(公告)日:1995-05-02
申请号:US114528
申请日:1993-08-31
申请人: Mark J. Sherly , Hans C. Sowa , Michelle M. Bray
发明人: Mark J. Sherly , Hans C. Sowa , Michelle M. Bray
CPC分类号: H04L9/083 , H04L9/0822 , H04L9/0891 , H04L9/12
摘要: A key management system permits a high degree of autonomous rekeying activity by communication units (105) in a secure communication system (100). Responsive to time reference information transmitted by a key management controller (101), the communication units (105) activate a designated key index at a predetermined activation time. If conditions so indicate, a communication unit may transmit a rekey request.
摘要翻译: 密钥管理系统通过安全通信系统(100)中的通信单元(105)允许高度自主的密钥密钥活动。 响应于由密钥管理控制器(101)发送的时间参考信息,通信单元(105)在预定的激活时间激活指定的密钥索引。 如果条件如此指示,则通信单元可以发送重新密钥请求。
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