Ciphering as a part of the multicast concept
First Claim
Patent Images
1. A method, comprising:
- encrypting a multicast message by using ciphering in a multicast service control device, wherein, for ciphering, a ciphering key is used;
sending the encrypted multicast message from the multicast service control device to a plurality of user entities;
sending, in a first message when a user entity from the plurality of user entities registers with a multicast service, a first part of a ciphering information to the user entity; and
sending, in a second message, a second part of the ciphering information to the user entity, when a multicast transmission of encrypted messages is activated by the multicast service control device;
wherein the ciphering information comprises at least one parameter from which the ciphering key is derived, wherein the ciphering key is derived by at least one of the plurality of user entities based on at least the first part of the ciphering information and the second part of the ciphering information forming the at least one parameter.
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Abstract
The invention proposes a method for transmitting a message to a plurality of user entities in a network by using a multicast service, comprising the steps of encrypting a multicast message by using ciphering, and sending the encrypted multicast message to the plurality of user entities simultaneously. The invention also proposes a corresponding multicast service control device and a corresponding user entity.
42 Citations
55 Claims
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1. A method, comprising:
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encrypting a multicast message by using ciphering in a multicast service control device, wherein, for ciphering, a ciphering key is used; sending the encrypted multicast message from the multicast service control device to a plurality of user entities; sending, in a first message when a user entity from the plurality of user entities registers with a multicast service, a first part of a ciphering information to the user entity; and sending, in a second message, a second part of the ciphering information to the user entity, when a multicast transmission of encrypted messages is activated by the multicast service control device; wherein the ciphering information comprises at least one parameter from which the ciphering key is derived, wherein the ciphering key is derived by at least one of the plurality of user entities based on at least the first part of the ciphering information and the second part of the ciphering information forming the at least one parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus, comprising:
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a physical encrypting processor configured to encrypt a multicast message by using ciphering, wherein, for ciphering, a ciphering key is used; and a physical transmitter configured to send the encrypted multicast message to a plurality of user entities, wherein the transmitter is further configured to send, in a first message when a user entity from the plurality of user entities registers with a multicast service, a first part of a ciphering information to the user entity, and to send, in a second message, a second part of the ciphering information to the user entity, when a multicast transmission of encrypted messages is activated by the multicast service; wherein the ciphering information comprises at least one parameter from which the ciphering key is derived, wherein the ciphering key is derived by at least one of the plurality of user entities based on at least the first part of the ciphering information and the second part of the ciphering information forming the at least one parameter. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An apparatus, comprising:
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a physical receiver configured to receive an encrypted multicast message transmitted to a plurality of user entities in a network by using a multicast service; and a physical decrypting processor configured to decrypt the encrypted multicast message by using ciphering, wherein, for ciphering, a ciphering key is used, wherein the receiver is further configured to receive, in a first message, a first part of ciphering information when a user entity from the plurality of user entities registers with a multicast service, and to receive, in a second message, a second part of the ciphering information when a multicast transmission of encrypted multicast messages is activated by the multicast service, wherein the ciphering information comprises at least one parameter from which the ciphering key is derived, wherein the ciphering key is derived by at least one of the plurality of user entities based on at least the first part of the ciphering information and the second part of the ciphering information forming the at least one parameter. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A system, comprising:
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a multicast service control node, wherein the multicast service control node further comprises; a physical encrypting processor configured to encrypt a multicast message by using ciphering, wherein, for ciphering, a ciphering key is used, and a physical transmitter configured to send the encrypted multicast message to a plurality of user entities; and a user entity from the plurality of user entities wherein the user entity further comprises a receiver configured to receive the encrypted multicast message transmitted to the plurality of user entities in a network by using a multicast service, and a physical decrypting processor configured to decrypt the encrypted multicast message by using ciphering and the ciphering key, wherein the physical transmitter is further configured to send, in a first message, a first part of ciphering information to the user entity when the user entity registers with the multicast service, and to send, in a second message, a second part of the ciphering information to the user entity when a multicast transmission of encrypted multicast messages is activated by the multicast service, wherein the receiver is further configured to receive the first part of the ciphering information when the user entity registers with the multicast service, and to receive the second part of the ciphering information when a multicast transmission of encrypted multicast messages is activated, wherein the ciphering information comprises at least one parameter from which the ciphering parameter is derived, wherein the ciphering key is derived by at least one of the plurality of user entities based on at least the first part of the ciphering information and the second part of the ciphering information forming the at least one parameter.
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44. A method, comprising:
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receiving, at a physical receiver, an encrypted multicast message encrypted using a ciphering key and transmitted to a plurality of user entities in a network by using a multicast service; decrypting the encrypted multicast message by using ciphering; receiving, in a first message, when a user entity from the plurality of user entities registers with the multicast service, a first part of ciphering information; and receiving, in a second message, a second part of the ciphering information, when a multicast transmission of encrypted messages is activated by the multicast service, wherein the ciphering information comprises at least one parameter from which the ciphering key is derived, wherein the ciphering key is derived by at least one of the plurality of user entities based on at least the first part of the ciphering information and the second part of the ciphering information forming the at least one parameter. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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Specification