Method and system for a secure digital decoder with secure key distribution
First Claim
1. A method of securely processing a digital signal comprising:
- a) generating a first public encryption key for use with a first logical circuit and a second logical circuit, and generating a second public encryption key for use with said first logical circuit and a third logical circuit;
in a digital media receiving device;
b) generating a local encryption key and a local decryption key at said first logical circuit;
c) at said first logical circuit, encrypting said local encryption key by use of said first public encryption key and encrypting said local decryption key by use of said second public encryption key;
d) transferring said encrypted local encryption key to said second logical circuit and transferring said encrypted local decryption key to said third logical circuit across a communication link;
e) decrypting said encrypted local encryption key at said second logical circuit and decrypting said encrypted local decryption key at said third logical circuit; and
f) transferring said digital signal in encrypted form from said second logical circuit to said third logical circuit across a second communication link.
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Accused Products
Abstract
A method and system for securely decrypting and decoding a digital signal is disclosed. One embodiment of the present invention first accesses an encrypted signal at a first logical circuit. Next, this embodiment determines a broadcast encryption key for the encrypted signal at a second logical circuit separate from the first logical circuit. For example, the second logical circuit where the broadcast key was determined may be across a communication link from the first circuit where the signal is being received. Then, the broadcast encryption key is encrypted by means of a public key and transferred over the communication link. Next, at the first logical circuit, the encrypted broadcast encryption key is decrypted. Therefore, the broadcast encryption key is determined. Then, at the first logical circuit, the encrypted signal is decrypted using the broadcast encryption key. Consequently, the encrypted signal is decrypted without exposing the broadcast encryption key on the communication link in an un-encrypted form.
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Citations
9 Claims
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1. A method of securely processing a digital signal comprising:
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a) generating a first public encryption key for use with a first logical circuit and a second logical circuit, and generating a second public encryption key for use with said first logical circuit and a third logical circuit;
in a digital media receiving device;
b) generating a local encryption key and a local decryption key at said first logical circuit;
c) at said first logical circuit, encrypting said local encryption key by use of said first public encryption key and encrypting said local decryption key by use of said second public encryption key;
d) transferring said encrypted local encryption key to said second logical circuit and transferring said encrypted local decryption key to said third logical circuit across a communication link;
e) decrypting said encrypted local encryption key at said second logical circuit and decrypting said encrypted local decryption key at said third logical circuit; and
f) transferring said digital signal in encrypted form from said second logical circuit to said third logical circuit across a second communication link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification