Verfahren zur Datensicherung in einem Pay-TV-System unter Verwendung eines Kryptosystems mit öffentlichem Schlüssel
摘要
For data security in a pay-TV system, a public key is in each case determined from a secret key which is allocated by the programme provider to the pay-TV receiver and which is used in the programme distribution centre to encrypt secondary-key information in order to adapt the pay-TV receiver to repeatedly modified modes of transmission which are provided in the programme distribution centre for the pay-TV receiver. The programme provider can define new keys from time to time. The initial settings of scramblers and descramblers can be modified as modes of transmission. <IMAGE>
申请公布号
DE59309396(D1)
申请公布日期
1999.04.01
申请号
DE1993509396
申请日期
1993.06.30
申请人
SIEMENS AG, 80333 MUENCHEN, DE
发明人
MOEHRMANN, KARL HEINZ, DIPL.-ING., D-81369 MUENCHEN, DE