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    A SECURITY SYSTEM FOR SSTV ENCRYPTION.
    1.
    发明公开
    A SECURITY SYSTEM FOR SSTV ENCRYPTION. 失效
    保障制度SSTV加密。

    公开(公告)号：EP0094423A4

    公开(公告)日：1986-11-27

    申请号：EP83900222

    申请日：1982-11-19

    申请人： COMMUNICATIONS SATELLITE CORP

    发明人： LEE LIN-NAN ,  FANG RUSSELL J

    IPC分类号： H04K1/00 ,  H04L9/00 ,  H04L9/08 ,  H04L9/24 ,  H04M1/32 ,  H04N7/16 ,  H04N7/167 ,  H04N7/169 ,  H04N7/20 ,  H04N21/2347 ,  H04N21/4405

    CPC分类号： H04N7/1675

    摘要： In a secure communications system, a key number which is changed periodically, e.g. monthly, and a random number from a random number generator are combined and used as a seed to reset a PN sequence generator, with the output of the generator being used to control encryption of transmission data in a signal processor. The key is also provided to a first encipherer to encipher the random number for transmission with the encrypted data. At the receiver, the key is provided on common to a decipherer for deciphering the random number and a PN sequence generator which is periodically reset by the combination of the key and random number in the same manner as in the transmitter. The PN sequence is then used to decrypt the information. User identification codes are stored in the transmitter and are used to encipher the key, with each employing its ID code to decipher the key. The user ID codes are known only to the system operator, so that not even a particular user can know the key.

    Cordless data/facsimile modem
    2.
    发明公开
    Cordless data/facsimile modem 失效
    Drahtloses ModemfürDaten und Faksimile

    公开(公告)号：EP0788285A2

    公开(公告)日：1997-08-06

    申请号：EP96308811.7

    申请日：1996-12-05

    申请人： International Business Machines Corporation

    发明人： Cina, Michael Frank ,  Flint, Ephraim Bemis ,  Gaucher, Brian Paul ,  Kwark, Young Hoon ,  Oprysko, Modest Michael ,  Pence, William Edward ,  Ponnapalli, Saila

    IPC分类号： H04Q7/32 ,  H04M1/32

    CPC分类号： H04W68/00 ,  H04M1/725 ,  H04W4/18 ,  H04W24/00 ,  H04W76/10 ,  H04W84/10 ,  H04W88/08

    摘要： A cordless modem comprises a radio pair interfaced to a standard data/fax modem which allows a user of a personal computer to wirelessly connect to a telephone line. One end of the radio pair is a remote unit interfaced to the modem contained within the PC while the other end is a base unit connected to a standard telephone wall jack. This arrangement allows the user the convenience and freedom of using a PC, laptop, personal digital assistant, etc., within several hundred feet of a phone jack without being encumbered by a cord. A warning alarm on the remote unit informs the user when the signal strength between the radio pair is below a threshold value. Additionally, the base unit may be equipped with two spatially separated antennas to help mitigate the effects of signal fading.

    摘要翻译： 无线调制解调器包括接口到标准数据/传真调制解调器的无线电对，其允许个人计算机的用户无线地连接到电话线。 无线电对的一端是连接到PC内的调制解调器的远程单元，而另一端是连接到标准电话墙壁插座的基座单元。 这种布置允许用户在电话插孔的几百英尺内使用PC，笔记本电脑，个人数字助理等的便利和自由，而不被电线阻塞。 遥控器上的警告报警通知用户无线电对之间的信号强度低于阈值。 此外，基本单元可以配备有两个空间分离的天线，以帮助减轻信号衰落的影响。

    A SECURITY SYSTEM FOR SSTV ENCRYPTION
    5.
    发明授权
    A SECURITY SYSTEM FOR SSTV ENCRYPTION 失效
    用于SSTV加密的安全系统

    公开(公告)号：EP0094423B1

    公开(公告)日：1990-09-05

    申请号：EP83900222.7

    申请日：1982-11-19

    申请人： COMMUNICATIONS SATELLITE CORPORATION

    发明人： LEE, Lin-nan ,  FANG, Russell J.

    IPC分类号： H04M1/32 ,  H04L9/00 ,  H04N7/16

    CPC分类号： H04N7/1675

    摘要： In a secure communications system, a key number which is changed periodically, e.g. monthly, and a random number from a random number generator are combined and used as a seed to reset a PN sequence generator, with the output of the generator being used to control encryption of transmission data in a signal processor. The key is also provided to a first encipherer to encipher the random number for transmission with the encrypted data. At the receiver, the key is provided on common to a decipherer for deciphering the random number and a PN sequence generator which is periodically reset by the combination of the key and random number in the same manner as in the transmitter. The PN sequence is then used to decrypt the information. User identification codes are stored in the transmitter and are used to encipher the key, with each employing its ID code to decipher the key. The user ID codes are known only to the system operator, so that not even a particular user can know the key.