Apparatus and method for ciphering/deciphering a signal in a communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsJi-Cheol Lee, Jun-Hyuk Song, Geun-Hwi Lim
Life of this patent
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Abstract
In a communication system, second encryption information is generated using first encryption information when data to be transmitted is generated. The data is encrypted using the second encryption information and third encryption information. A signal including the encrypted data and the first encryption information is generated and transmitted.
Claims16
A method for transmitting a signal in a communication system, comprising the steps of:
- generating second ciphering information using first ciphering information when data to be transmitted is generated;
- ciphering the data using the second ciphering information and third ciphering information;
- and
- generating and transmitting a signal that includes the cipheried data and the first ciphering information.
An apparatus for transmitting a signal in a communication system, comprising:
- a second-ciphering-information generator for generating second ciphering information using first ciphering information;
- an ciphering unit for ciphering data using the second ciphering information and third ciphering information when the data to be transmitted is generated;
- and
- a signal generator for generating and transmitting a signal that includes the cipheried data and the first ciphering information.
A method for transmitting multicast and broadcast service (MBS) streams in a communication system, comprising the steps of:
- generating an initial counter value using a frame number of the communication system and a rollover counter (ROC) when MBS data to be transmitted is generated;
- generating n counter values by incrementing the initial counter value by one;
- generating n cipher blocks using the n counter values and an MBS traffic key (MTK);
- fragmenting the MBS data into n plain texts;
- generating MBS streams by performing exclusive OR (XOR) logical operations on the n plain texts and the cipher blocks;
- and
- generating and transmitting n MBS payloads that include one of the n MBS streams and the ROC, respectively.
An apparatus for transmitting multicast and broadcast service (MBS) streams in a communication system, comprising:
- an initial counter value generator for generating an initial counter value using a frame number of the communication system and a rollover counter (ROC);
- a counter for generating n counter values by incrementing the initial counter value by one when MBS data to be transmitted is generated;
- n cipher block generators for generating n cipher blocks using the n counter values and an MBS traffic key (MTK);
- and
- n exclusive OR (XOR) logical operators for performing XOR logical operations on the cipher blocks and n plain texts into which the MBS data is fragmented, and generating MBS streams.
Dependencies are inferred from the claim text.