| 摘要 |
In a communications system, transmission takes place in discrete time period bursts and a stream cipher algorithm is used to generate a key stream portion for encrypting information bits to be transmitted in a single transmission burst. The length of the key stream portion generated for encryption of the next transmission burst is adjust on the basis of the number of said information bits to be transmitted in the next transmission burst. Application to any communications system which produces a stream cipher, like, for example, GSM, TETRA, DECT, GPRS, EDGE and UMTS.
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