Patent ID: 8483387

Claim:
A method for generating private keys to encrypt and decrypt data to be transmitted in a wireless network including a first node and a second node, comprising: estimating, in the first node, a first channel response to the second node; estimating, in the second node, a second channel response to the first node; quantizing, in the first node, the first channel response to produce a first bit sequence and a feed-forward message during the quantizing, wherein, the feed-forward message includes n×m bits, which are generated by partitioning each quantization level into 2 m sub-regions, and n is a number of measurement of the first channel response; transmitting the feed-forward message to the second node; quantizing, in the second node, the second channel response using the feed-forward message to produce an estimate of the first bit sequence, a second bit sequence and a feed-back message, wherein the n×m bits are used in a maximum a posteriori probability equalizer; transmitting the feed-back message to the first node; deleting, in the first node, bits in the first bit sequence using the feed-back message to generate a first private key; and deleting, in the second node, bits in the second hit sequence using the feed-forward message to generate a second private key.