Method and apparatus for security in a data processing system

  • US 7,185,362 B2
  • Filed: 08/28/2002
  • Issued: 02/27/2007
  • Est. Priority Date: 08/20/2001
  • Status: Active Grant
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First Claim
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1. A method for a remote station to extract data from at least one encrypted packet of data provided by a broadcast service, comprising:

  • receiving a broadcast access key for the broadcast service;

    receiving an encrypted packet of data from a plurality of encrypted packets of data, wherein the each encrypted packet of data is associated with one short-term key from a plurality of short-term keys, wherein each short-term key is associated with a first number,receiving the first number corresponding to the short-term key associated with the encrypted packet of data;

    generating the short-term key using the broadcast access key and the first number;

    extracting a packet of data from the encrypted packet of data using the short-term key;

    encrypting the broadcast access key to form an encrypted broadcast access key comprising;

    storing a root key in the secure memory storage unit, wherein the root key is associated with the secure memory storage unit, wherein the root key is also stored in a fifth server,wherein the fifth server is part of a first server, andwherein extracting the encrypted broadcast access key further comprises;

    decrypting the EBAK based on the root key stored in the secure memory storage unit;

    storing the encrypted broadcast access key in a secure memory storage unit; and

    extracting the encrypted broadcast access key (EBAK) from the secure memory storage unit.

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