Method for the encryption of data transfer
First Claim
1. A method for the encryption of information transferred between data transfer devices in a data communication system wherein plural data frames are created from one or more data packets formed from the information by a communication application, and individual ones of these data frames comprise at least a header field and a data field, wherein the method comprises steps of:
- ciphering at least one part of the data packets by using a ciphering key;
attaching synchronization data to the data frames, wherein the synchronization data includes a sequence number of each of said data frames; and
changing the value of the ciphering key at least at the transmission of each of said data frames.
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Accused Products
Abstract
The object of the invention is a method for the encryption of information transferred between data transfer devices (MS, SGSN) in a data communication system wherein one or more data frames are created from one or more data packets formed from the information by the application. The data frames comprise at least a header field and a data field. In the method, at least some part of the data packets is ciphered by using a ciphering key (Kc). To the data frames, synchronization data (COUNT) is attached, the value of which is changed at least at the transmission of each data frame.
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Citations
21 Claims
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1. A method for the encryption of information transferred between data transfer devices in a data communication system wherein plural data frames are created from one or more data packets formed from the information by a communication application, and individual ones of these data frames comprise at least a header field and a data field, wherein the method comprises steps of:
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ciphering at least one part of the data packets by using a ciphering key; attaching synchronization data to the data frames, wherein the synchronization data includes a sequence number of each of said data frames; and changing the value of the ciphering key at least at the transmission of each of said data frames. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A data communication system which comprises means for encryption of information transferred between data transfer devices, means for forming one or more data packets of the information and means for forming data frames of the data packets, the means for encryption of information comprise at least:
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means for ciphering data packets by a ciphering key, means for changing a value of the ciphering key for each of a plurality of transmission blocks; means for attaching synchronization data to data frames, means for changing the value of the synchronization data (COUNT) at the transmission of each data frame, wherein the synchronization data includes sequence numbers of respective ones of the data frames, and means for interpreting synchronization data in the data transfer device of the receiver. - View Dependent Claims (18, 19, 20, 21)
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Specification