System and method for providing security in data communication systems
First Claim
1. A method for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to the receiver, the method comprising the steps of:
- encoding said data using a first-level encoding scheme;
encoding said first-level encoded data using a second-level encoding scheme; and
transmitting said second-level encoded data;
wherein, as a result of encoding data using said first and second-level encoding scheme, only a user capable of decoding said first-level encoded data and connected to a receiver capable of decoding said second-level encoded data can access said transmitted data.
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Accused Products
Abstract
A system and method for providing security in data communication systems where multiple users are coupled to a common receiving system. The data is encrypted or otherwise encoded by a sender using a key. The encrypted data is then scrambled or otherwise encoded, and transmitted by the sender. The transmitted data is received at a receiver where it is descrambled or otherwise decoded. An authorized user decrypts or otherwise decodes the descrambled data using a key to retrieve clear data. The key itself is encrypted by the sender using an asymmetric encryption algorithm, and is then transmitted by the sender. The authorized user decrypts the encrypted key using the asymmetric encryption algorithm, and uses the key to decrypt the encrypted data.
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Citations
22 Claims
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1. A method for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to the receiver, the method comprising the steps of:
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encoding said data using a first-level encoding scheme; encoding said first-level encoded data using a second-level encoding scheme; and transmitting said second-level encoded data; wherein, as a result of encoding data using said first and second-level encoding scheme, only a user capable of decoding said first-level encoded data and connected to a receiver capable of decoding said second-level encoded data can access said transmitted data. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to said receiver, the method comprising the steps of:
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receiving said data at said receiver; decoding said data using a second-level decoding scheme wherein said data has been encoded using a second-level encoding scheme by the sender; and the authorized user decoding said data using a first-level decoding scheme wherein the data has been encoded using a first-level encoding scheme by the sender. - View Dependent Claims (8, 9, 10, 11)
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12. A system for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to the receiver, comprising:
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first-level encoder means for encoding said data using a first-level encoding scheme; second-level encoder means, connected to said first-level encoder means, for encoding said first-level encoded data using a second-level encoding scheme; and transmitter means, connected to said second-level encoder means, for transmitting said second-level encoded data; wherein, as a result of encoding data using said first and second-level encoding scheme, only a user capable of decoding said first-level encoded data and connected to a receiver capable of decoding said second-level encoded data can access said transmitted data. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An system for providing security in a data transmission system where data is transmitted from a sender to an authorized user via a receiver, the authorized user being one of a plurality of users connected to said receiver, comprising:
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receiver means for receiving said data; a second-level decoder means, connected to said receiver means, for decoding said data that has been encoded by the sender using a second-level encoder means; and first-level decoder means, connected to said second-level decoder means, for decoding said second-level decoded data that has been encoded by the sender using a first-level encoder means. - View Dependent Claims (19, 20, 21, 22)
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Specification