Title: Methods and apparatuses for self-generating fault-tolerant keys in spread-spectrum systems

Abstract

Self-generating fault-tolerant keys for use in spread-spectrum systems are disclosed. At a communication device, beacon signals are received from another communication device and impulse responses are determined from the beacon signals. The impulse responses are circularly shifted to place a largest sample at a predefined position. The impulse responses are converted to a set of frequency responses in a frequency domain. The frequency responses are shuffled with a predetermined shuffle scheme to develop a set of shuffled frequency responses. A set of phase differences is determined as a difference between an angle of the frequency response and an angle of the shuffled frequency response at each element of the corresponding sets. Each phase difference is quantized to develop a set of secret-key quantized phases and a set of spreading codes is developed wherein each spreading code includes a corresponding phase of the set of secret-key quantized phases.

Inventors:

Moradi, Hussein; Farhang, Behrouz; Subramanian, Vijayarangam

Issue Date:

2015-12-15

Research Org.:

Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1229725

Patent Number(s):

9215587

Application Number:

14/163,723

Assignee:

Battelle Energy Alliance, LLC

Patent Classifications (CPCs):

H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04B - TRANSMISSION

H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04J - MULTIPLEX COMMUNICATION

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H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04B - TRANSMISSION

H04B1/69 - Spread spectrum techniques
H04B1/707 - using direct sequence modulation
H04B1/709 - Correlator structure
H04B1/7093 - Matched filter type
H04B1/71 - the interference being narrowband interference
H04B2001/70935 - {using a bank of matched fileters, e.g. Fast Hadamard Transform}

H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04J - MULTIPLEX COMMUNICATION

H04J11/0023 - {Interference mitigation or co-ordination

H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04K - SECRET COMMUNICATION

H04K3/25 - {based on characteristics of target signal or of transmission
H04K3/827 - {using characteristics of target signal or of transmission

H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04L - TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION

H04L1/04 - using frequency diversity
H04L2209/24 - Key scheduling, i.e. generating round keys or sub-keys for block encryption
H04L2209/80 - Wireless
H04L5/0021 - {in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA}
H04L9/0816 - {Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use}
H04L9/0875 - {based on channel impulse response [CIR]}

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DOE Contract Number:  

AC07-05ID14517

Resource Type:

Patent

Resource Relation:

Patent File Date: 2014 Jan 24

Country of Publication:

United States

Language:

English

Subject:

42 ENGINEERING