Method for local conditional access for mobile equipments
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United States of America Patent
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N/A
Issued Date -
Jan 24, 2008
app pub date -
May 11, 2006
filing date -
May 13, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method is disclosed for conditional access to a digital data stream encrypted with at least one first control word and broadcasted via an emitter of a broadcasting network to at least one mobile equipment. The latter also is connected via a mobile communication network to a management center. The stream contains control messages encrypted with a transmission key and includes a second control word obtained by the encryption of the first control word with a local key. The method includes reception by the mobile equipment of at least one cryptogram via the mobile network, determination of at least one local key from the received cryptogram, and reception of a control message via the broadcasting network, decryption of the message and obtaining the second control word. The method further includes decryption of the second control word with the local key and obtaining the first control word and decryption of the data of the stream with the first control word
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International Classification(s)
- H04L:TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAP....
- H03M:CODING, DECODING OR CODE CONVERSION, IN GENERAL
- H04N:PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06F:ELECTRIC DIGITAL DATA PROCESSING
- H04K:SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- G06K:RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD ....
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