Encryption of management frames for securing long training field sequence generation and scheme for transmitting sounding signal indications
The disclosure provides some embodiments for securing long training field (LTF) sequence. A responding station (RSTA) configures a location management report (LMR) frame. The LMR frame is configured to include an LMR in respect of a previous measurement, and data to be used to generate a null data packet (NDP) for a current measurement that is to be performed following the previous measurement. The RSTA further encrypts the LMR frame using protected management frames (PMF) scheme, and transmits the encrypted LMR frame to an initiating station (ISTA) for generating an LTF sequence for the current measurement. In response to receiving an NDP announcement (NDPA) and an NDP for the current measurement from the ISTA, the RSTA generates an NDP for the current measurement based on the NDPA and the data using CCMP, and transmits the NDP to the ISTA.
1. An apparatus comprising memory and processing circuitry to cause a responding station (RSTA) to:
configure a location management report (LMR) frame to include an LMR in accordance with a previous measurement;
encrypt the LMR frame using a protected management frames (PMF) scheme;
configure the LMR frame to include data to be used to generate a null data packet (NDP) for the current measurement;
transmit the encrypted LMR frame to an initiating station (ISTA) for generating a long training field (LTF) sequence for a current measurement that is to be performed following the previous measurement; and
in response to receiving a null data packet announcement (NDPA) and an input NDP for the current measurement from the ISTA, generate an output NDP for the current measurement based on the NDPA and the data using counter mode cipher block chaining message authentication code protocol (CCMP); and
transmit the output NDP to the ISTA.
2. The apparatus as claimed in claim 1 , wherein the processing circuitry is to cause the RSTA to configure the LMR frame to include an initialization vector that is to be used by the RSTA to generate the output NDP for the current measurement using CCMP.
3. The apparatus as claimed in claim 2 , wherein the processing circuitry is to cause the RSTA further to randomly generate the initialization vector for the current measurement.
4. The apparatus as claimed in claim 1 , wherein the processing circuitry is to cause the RSTA to configure the LMR frame to include a key that is to be used by the RSTA to generate the output NDP for the current measurement using CCMP.
5. The apparatus as claimed in claim 1 , wherein the processing circuitry is to cause the RSTA to configure the LMR frame to include a measurement identifier associated with the current measurement.
6. The apparatus as claimed in claim 1 , wherein the processing circuitry is to cause the RSTA, after transmitting the encrypted LMR frame to the ISTA, further to:
in response to receiving, from the ISTA, a null data packet announcement (NDPA) with a measurement identifier of 0, configure a new LMR frame to include a measurement identifier associated with a next measurement that is to be performed following the current measurement without generating a null data packet (NDP) for the current measurement;
encrypt the new LMR frame using the PMF scheme; and
transmit the encrypted new LMR frame to the ISTA.
7. The apparatus as claimed in claim 1 , wherein the processing circuitry is to cause the RSTA further to generate a message integrity check (MIC) code based on a transient key that is used to encrypt the LMR frame, and to transmit the MIC code to the ISTA together with the encrypted LMR frame.
8. The apparatus as claimed in claim 1 , wherein the processing circuitry is to cause the RSTA to configure the LMR frame to include a first measurement identifier associated with the current measurement, and to cause the RSTA, after transmitting the encrypted LMR frame to the ISTA, further to:
in response to receiving, from the ISTA, a null data packet announcement (NDPA) with a second measurement identifier that is not identical to the first measurement identifier included in the LMR frame, generate a predetermined null data packet (NDP), transmit the predetermined NDP to the ISTA, configure a new LMR frame to inform the ISTA to ignore previously received NDP and LMR frame, and transmit the new LMR frame to the ISTA.
9. The apparatus as claimed in claim 1 , wherein the processing circuitry is to cause the RSTA to configure the LMR frame to include data that is to be used to generate a null data packet (NDP) for the current measurement, and to cause the RSTA further to:
generate a trigger frame for the current measurement;
transmit the trigger frame to the ISTA;
in response to receiving an input NDP for the current measurement from the ISTA, generate an output NDP for the current measurement based on the data using counter mode cipher block chaining message authentication code protocol (CCMP); and
transmit the output NDP to the ISTA.
10. The apparatus as claimed in claim 9 , wherein the processing circuitry is to cause the RSTA, after transmitting the encrypted LMR frame to the ISTA, further to:
in response to receiving, from the ISTA, a polling response with a first measurement identifier of 0, configure a new LMR frame to include a second measurement identifier associated with a next measurement that is to be performed following the current measurement without generating a null data packet (NDP) frame for the current measurement;
encrypt the new LMR frame using PMF scheme; and
transmit the encrypted new LMR frame to the ISTA.