Generation of perfectly secret keys in wireless communication networks

A wireless transmit/receive unit (WTRU) comprising:

• a receiver configured to receive a radio signal and to receive antenna configuration information from a second WTRU;
• a processor configured to:
• generate a channel impulse response (CIR) estimate for the radio signal, wherein the CIR estimate is generated based, at least in part, on the antenna configuration information;
• determine a starting point within the CIR estimate;
• generate a long secret key based on the CIR estimate;
• and
• generate a perfectly secret encryption key based on the long secret key;
• and
• a transmitter configured to transmit the starting point to a second WTRU.

A method comprising:

• receiving a radio signal at a first wireless transmit/receive unit (WTRU);
• receiving antenna configuration information from a second WTRU at the first WTRU;
• receiving a starting point for CIR estimation from a second WTRU at the first WTRU;
• generating, at the first WTRU, a channel impulse response (CIR) estimate for the radio signal using the starting point, wherein the CIR estimate is generated based, at least in part, on the antenna configuration information;
• generating a long secret key based on the CIR estimate;
• and
• generating a perfectly secret encryption key based on the long secret key.

A wireless transmit/receive unit (WTRU) comprising:

• a receiver configured to:
• receive a radio signal;
• receive antenna configuration information from a second WTRU;
• and
• receive a starting point for a CIR estimate from a second WTRU;
• and
• a processor configured to:
• generate a channel impulse response (CIR) estimate for the radio signal using the starting point, wherein the CIR estimate is generated based, at least in part, on the antenna configuration information;
• generate a long secret key based on the CIR estimate;
• and
• generate a perfectly secret encryption key based on the long secret key.