Cipher method and system for multicast service
First Claim
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1. A cipher system for multicast service, comprising:
- a group, which has multiple user equipments with respective keys orthogonal to one another;
a content provider, which provides a message to the user equipments of the group; and
a broadcast multi-service center (BM-SC) server, which has a key set composed of the keys of all user equipments of the group to accordingly encipher the message provided by the content provider so as to obtain an enciphered message for broadcast, such that all user equipments of the group receive and decipher the enciphered message with the respective keys, thereby correctly receiving the message.
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Abstract
A cipher method and system for multicast service. A group includes multiple user equipment, each having a respective key. The keys are orthogonal to one another. A content provider provides a raw message to the user equipment of the group. A BM-SC server has a key set composed of the respective keys of all user equipment of the group to encipher the raw message to thus obtain an enciphered message for broadcast. All user equipment of the group receives and deciphers the enciphered message with the respective keys. When a user equipment leaves the group, the key set held by BM-SC is updated by removing the key of the leaving user equipment.
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Citations
8 Claims
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1. A cipher system for multicast service, comprising:
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a group, which has multiple user equipments with respective keys orthogonal to one another;
a content provider, which provides a message to the user equipments of the group; and
a broadcast multi-service center (BM-SC) server, which has a key set composed of the keys of all user equipments of the group to accordingly encipher the message provided by the content provider so as to obtain an enciphered message for broadcast, such that all user equipments of the group receive and decipher the enciphered message with the respective keys, thereby correctly receiving the message. - View Dependent Claims (2, 3, 4)
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5. A cipher method for multicast service, the multicast service using a content provider to provide a message to multiple user equipments of a group, a broadcast multi-service center (BM-SC) server to encipher the message provided by the content provider to thus obtain an enciphered message for broadcast, and the user equipments of the group to receive and decipher the enciphered message, the method comprising the steps of:
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(A) assigning a respective key to each user equipment of the group, wherein the respective keys are orthogonal to one another;
(B) providing a message by the content provider;
(C) using the broadcast multi-service center (BM-SC) server to encipher the message with a key set composed of the respective keys of all user equipments of the group, thereby obtaining an enciphered message for broadcast; and
(D) receiving and deciphering the enciphered message with the respective keys of the user equipments of the group, thereby correctly receiving the message. - View Dependent Claims (6, 7, 8)
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Specification