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Method for transmitting encrypted data, associated decrypting method, device for carrying out said methods and a mobile terminal for the incorporation thereof

  • US 7,620,184 B2
  • Filed: 07/21/2003
  • Issued: 11/17/2009
  • Est. Priority Date: 07/30/2002
  • Status: Active Grant
First Claim
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1. A method for transmitting encrypted data between a sender mobile terminal and at least one receiver mobile terminal of a digital radiocommunication system, through a radio transmission channel having a frame structure such that a TDMA frame comprises time slots of a first type forming a traffic channel for the transmission of traffic information and at least one time slot of a second type forming an associated signaling channel for the transmission of signaling information, wherein a sequence of encrypted data packets is transmitted in the traffic channel starting from a determined time slot of the first type whereas an associated cryptographic synchronization information cue is periodically transmitted in the associated signaling channel inside a determined time slot of the second type which is timely separated from said time slot of the first type by an undetermined time gap, and wherein a cryptographic synchronization delay information cue relating to said time gap is also periodically transmitted in the associated signaling channel.

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