Message authentication
First Claim
1. A method of providing message authentication in a communication system comprising the steps of:
- transmitting a first message from a first device to a second device;
transmitting a second message from the second device to the first device, the second message including a message authentication code determined using said first and second messages;
transmitting a third message from the first device to the second device, the third message including a message authentication code determined using the third message.
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Accused Products
Abstract
There is disclosed a technique of providing message authentication in a communication system comprising the steps of: transmitting a first message from a first device to a second device; transmitting a second message from the second device to the first device, the second message including a message authentication code determined using said first and second messages; transmitting a third message from the first device to the second device, the third messages including a message authentication code determined using the third message. The message authentication code of the third message may be additionally based on the second or the second and first messages.
361 Citations
30 Claims
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1. A method of providing message authentication in a communication system comprising the steps of:
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transmitting a first message from a first device to a second device;
transmitting a second message from the second device to the first device, the second message including a message authentication code determined using said first and second messages;
transmitting a third message from the first device to the second device, the third message including a message authentication code determined using the third message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of providing message authentication in a communication system comprising transmitting a plurality of messages between a first device and a second device, wherein a message includes a message authentication code determined using at least said message and another message includes a further message authentication code determined using at least said other message, whereby the number of required message authentication code computations and transmissions may be reduced to two independently of the number of steps of the authentication procedure.
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17. A communication system for providing message authentication between two communicating devices, each communicating device having respective transmitting and receiving means, and each communicating device having means for generating a message authentication code, comprising:
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in the first device, transmitting a first message from the second device;
in the second device, transmitting a second message to the first device, the second message including a message authentication code determined using said first and second messages;
in the first device transmitting a third message to the second device, the third messages including a message authentication code determined using the third message. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification