Spatial Self-Decoding for Secure Multipath Beam Communication
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Solution Overview
Problem
In multipath wireless communication environments, existing encryption methods are vulnerable to eavesdropping due to the accessibility of encrypted data via multiple paths, and cryptographic key management is challenging, especially when communications are transmitted wirelessly.
Innovation Solution
Spatial domain encoding is applied in multipath environments, where transmissions on different beams are separately encrypted with complex codes, and time delay, gain, and phase modifications are used to enable automatic self-decryption at the receiver location, eliminating the need to send encryption keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional encryption methods are used in multipath wireless communication, then communication security is compromised due to eavesdropping vulnerability, but implementing spatial domain encoding with multiple beams and complex codes increases system complexity
Solution Approach 1:
The transmitted signal is divided into multiple spatial paths (at least two different paths) with separate beamforming and complex codes applied to each path. This segmentation allows the signal to be encrypted differently on each path, preventing eavesdroppers from successfully decrypting the communication even if they intercept one path.
Solution Approach 2:
Different complex codes and beamforming parameters are applied locally to each spatial path based on the specific channel characteristics of that path. The first complex code is applied to the first path with first beamforming parameters, and the second complex code is applied to the second path with second beamforming parameters, creating path-specific encryption that enhances security.
2Ease of operation
If encryption keys are transmitted to the receiver for decryption, then decryption is enabled, but the keys become vulnerable to interception by eavesdroppers in multipath environments
Solution Approach 1:
The system performs self-service decryption where the receiver automatically decrypts the signal by combining the received signals from multiple paths. The decryption process is embedded in the spatial domain encoding itself through the use of complex codes and beamforming, eliminating the need for separate key transmission and enabling the receiver to decrypt without external key assistance.
Solution Approach 2:
Complex codes act as intermediaries that transform the encrypted signal into a form that can only be decrypted through the specific spatial combining process. Instead of transmitting decryption keys directly, the system uses complex codes on multiple paths that mediate the decryption process, making key interception unnecessary and ineffective.
3Reliability
If quantum encoding is used to make decoding more difficult, then security is improved, but separate time/frequency slots are needed to transmit encryption codes which can be intercepted
Solution Approach 1:
The encryption and communication processes are merged into a single simultaneous operation. The complex codes are applied to the communication signal itself on multiple spatial paths, rather than transmitting separate encryption codes in dedicated time/frequency slots. This combining eliminates the need for separate code transmission and enables continuous secure communication without time losses.
Data Source
AI summary
Various embodiments of the present disclosure provide for a method and apparatuses that perform spatial encoding in a multipath environment such that transmissions on different beams are separately encrypted with complex codes such that when the transmissions on the different beams are received at the receiver, the separate encryptions are cancelled out. The transmissions can also have time delay, gain, and phase modifications made to the transmissions such that the automatic self-decryption is performed within a predefined distance of where the receiver is determined to be. In this way, encryption/decryption keys do not have to be sent to the receiver, and unauthorized devices that intercept the beams at a location other than the receiver location will not be able to decrypt the communication.