Quantum DUKPT Key Derivation Without Physical Key Injection
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Solution Overview
Problem
Conventional DUKPT mechanisms require physical injection of the Initialization Key (IK) and are not quantum-resistant, leading to security vulnerabilities and the need for manual rekeying or decommissioning of terminals.
Innovation Solution
Implementing Quantum Random Number Generator (QRNG) to generate a unique Initialization Key (IK) per transaction, using an XOR function to derive a Terminal Identifier (TID), and employing quantum-safe symmetric cryptography to create unique cryptographic keys per transaction, eliminating the need for physical key injection and supporting an unlimited number of random keys from a large key space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical injection of Initialization Key is used, then key distribution is achieved, but security vulnerabilities and manual rekeying are required
Solution Approach 1:
The system enables automatic key generation and distribution through the host system, eliminating the need for manual physical key injection. The host automatically derives transaction keys and distributes them to terminals, making the system self-sufficient in key management operations.
Solution Approach 2:
The patent replaces the mechanical physical key injection process with an electronic/digital key derivation and distribution system. Instead of physically injecting keys into terminals, the system uses cryptographic algorithms to generate and distribute keys electronically through secure communication channels.
2Device complexity
If conventional DUKPT is used, then key management is simplified, but quantum resistance is lacking
Solution Approach 1:
The system changes the cryptographic parameters by implementing quantum-resistant algorithms in the key derivation process. This includes using post-quantum cryptographic primitives while maintaining the overall DUKPT framework, thereby upgrading the security parameters without completely redesigning the key management system.
3Ease of manufacture
If one base key is managed, then key injection is simplified, but key reuse occurs
Solution Approach 1:
The system segments the single base key into multiple unique transaction keys through cryptographic derivation. Each transaction receives a distinct key derived from the base key using unique parameters such as transaction counters or random nonces, ensuring key uniqueness while maintaining the simplicity of managing one base key at the host level.
Solution Approach 2:
The key system transitions from static to dynamic, where keys are generated on-demand for each transaction rather than being pre-injected. The base key dynamically derives different transaction keys based on transaction-specific parameters, making the key management adaptive and unique to each transaction.
4Reliability
If manual rekeying is required, then security can be maintained, but productivity decreases
Solution Approach 1:
The system enables continuous key generation and distribution without interruption to transaction processing. Keys are derived and distributed automatically in real-time as transactions occur, eliminating the need to stop operations for manual rekeying while maintaining security through continuous key rotation.
Data Source
AI summary
The arrangements disclosed herein relate to systems, apparatus, methods, and non-transitory computer readable media for Quantum for DUKPT (Q-DUKPT), where an Initialization Key (IK) using a Quantum Random Number Generator (QRNG). An identifier for a device is generated by performing XOR on a Base Derivation Key (BDK) and the IK. The device derives a key for each transaction to encrypt original data using IK or a previous key. The host receives from the device the encrypted original, the identifier, and a counter that indicates a current number of transactions. The host runs the same derive function used by the device for a number of iterations equal to the current number of transactions with IK as the initial input, to derive the key used to by the device to encrypt the original data.