Post-Quantum VPN Key Exchange Using Lattice-Based Algorithms
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Solution Overview
Problem
The security of existing virtual private networks (VPNs) is compromised by the emergence of quantum computers, necessitating the adoption of post-quantum cryptography to maintain encryption security.
Innovation Solution
A method for forming a virtual private network using post-quantum cryptography involves a handshake process between devices, where public and private keys are generated using lattice-based algorithms, enabling authentication and symmetric key generation through key capsules, ensuring secure communication even against quantum computer attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing encryption algorithms are used in VPN, then current security standards are met, but security is compromised by quantum computer attacks
Solution Approach 1:
The patent changes the cryptographic parameter foundation from classical mathematics (factoring, discrete logarithms) to lattice-based mathematics. This parameter change enables security that remains valid even against quantum computer attacks, as lattice problems are not efficiently solvable by quantum algorithms like Shor's algorithm is for classical problems.
2Reliability
If post-quantum cryptography is implemented, then security against quantum attacks is achieved, but device complexity increases
Solution Approach 1:
The patent segments the cryptographic system into distinct functional modules: key generation module, encapsulation module, decapsulation module, and authentication module. Each module handles a specific aspect of post-quantum cryptography, making the overall complex system more manageable and implementable through clear separation of concerns.
Solution Approach 2:
The patent introduces key capsules as an intermediary mechanism that simplifies the key exchange process. Instead of directly exchanging private keys or complex cryptographic parameters, devices exchange encrypted key capsules that can be safely transmitted over public channels, reducing the complexity of secure key management.
3Reliability
If lattice-based key exchange is used, then key leakage during exchange is prevented, but computation time increases
Solution Approach 1:
The patent performs preliminary key generation and encapsulation operations before actual VPN data transmission begins. The key establishment phase completes the lattice-based key exchange and generates symmetric keys in advance, so that subsequent data transmission can use faster symmetric encryption without repeated asymmetric operations.
Solution Approach 2:
The patent uses key capsules as copies or representations of the actual cryptographic keys. Instead of transmitting sensitive private keys directly, devices exchange encapsulated copies that contain the necessary information for key derivation but are safe to transmit publicly, reducing computation time for secure key exchange.
Data Source
AI summary
The technical idea of the present invention relates to a method for forming a virtual private network based on post-quantum cryptography and a virtual private network operating system performing the same. The method for forming a virtual private network performing by a first device to form a virtual private network with a second device according to an embodiment of the present invention comprises the steps of: requesting a handshake for forming the virtual private network; receiving a signature and a public key; authenticating the second device by using the signature; generating a symmetric key by using the public key; and performing virtual private network communication by using the symmetric key, wherein the public key is generated by using at least one key vector corresponding to a grid.