Quantum Key Distribution Using Ternary Encoding and PUFs
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Solution Overview
Problem
Conventional quantum key distribution (QKD) protocols require inefficient and vulnerable information exchange to detect eavesdropping, which reduces communication bandwidth and introduces additional security risks, especially against man-in-the-middle attacks.
Innovation Solution
The use of ternary cryptographic approaches and physical unclonable functions (PUFs) to encode and transmit data in a way that allows eavesdropping detection without additional information exchange, using shared keys to encrypt and decrypt the data stream, ensuring all possible values are represented until proper decryption, thus enhancing security and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional QKD protocols use two random number generators to select basis states and measurement bases, then security against eavesdropping is achieved through error rate measurement, but additional information exchange over unsecured channels is required which reduces communication bandwidth and introduces vulnerability to man-in-the-middle attacks
Solution Approach 1:
The patent extracts the error detection function from the main data transmission channel by using the fourth radix state as a dedicated detection marker. This allows eavesdropping detection to occur without requiring separate information exchange over unsecured channels, thereby maintaining security while preserving communication bandwidth for actual data transmission.
Solution Approach 2:
The patent makes the quantum channel multi-functional by using different radix states for different purposes: third radix states carry encrypted data while fourth radix states simultaneously serve as error detection markers. This eliminates the need for separate secure and unsecured channels, improving both bandwidth efficiency and security.
2Reliability
If error rate measurement is performed by exchanging partial information about the key over an unsecured channel, then eavesdropping detection is achieved, but the communication process becomes vulnerable to man-in-the-middle attacks and requires additional overhead
Solution Approach 1:
The patent introduces fourth radix state symbols as intermediary error detection markers that are embedded within the quantum transmission itself. These markers act as a mediator between the encrypted data and the verification process, allowing eavesdropping detection without requiring the parties to exchange key information over unsecured channels.
Solution Approach 2:
The patent applies preliminary anti-action by pre-embedding error detection markers (fourth radix states) into the transmission stream before encryption. This allows the receiver to detect eavesdropping attempts directly from the transmitted symbols without needing to exchange additional verification information, thereby preventing man-in-the-middle attacks.
3Reliability
If ternary cryptographic approaches with encoding transformations are used to exclude invalid symbols, then data integrity is enhanced, but the encoding and decoding process becomes more complex
Solution Approach 1:
The patent changes the parameter space by using a fourth radix system instead of traditional binary or ternary systems. This allows the inclusion of an explicit error detection symbol (the fourth radix state) without requiring complex encoding schemes, as the additional symbol naturally provides both data carrying and error detection capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables secure eavesdropping detection within the data stream without additional information exchange, improving communication bandwidth and security by utilizing shared keys and PUFs to maintain data integrity and detect tampering.
Implementation Method 1
Quantum cryptography takes advantage of consequences of the Heisenberg uncertainty principle, namely that measurement of a quantum state necessarily disturbs that state.
Data Source
AI summary
This invention disclosure describes how the security of existing quantum key distribution protocols can be enhanced with the use of a ternary/binary arithmetic conversion along with shared keys between communicating parties. With these schemes, Bob can detect eavesdropping attacks without exchanging the content of the transmitted data stream with the Alice. Addressable physical unclonable function (PUF) technology can be exploited to design protocols that securely exchange the shared keys.