Hacking Cryptographic Protocols with Advanced Variational Quantum Attacks

• URL: http://arxiv.org/abs/2311.02986v1
• Date: Mon, 6 Nov 2023 09:46:16 GMT
• Title: Hacking Cryptographic Protocols with Advanced Variational Quantum Attacks
• Authors: Borja Aizpurua, Pablo Bermejo, Josu Etxezarreta Martinez, Roman Orus
• Abstract summary: We implement simulations of our attacks for symmetric-key protocols such as S-DES, S-AES and Blowfish. We show how our attack allows a classical simulation of a small 8-qubit quantum computer to find the secret key of one 32-bit Blowfish instance with 24 times fewer number of iterations than a brute-force attack. Further applications beyond symmetric-key cryptography are also discussed, including asymmetric-key protocols and hash functions.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Here we introduce an improved approach to Variational Quantum Attack Algorithms (VQAA) on crytographic protocols. Our methods provide robust quantum attacks to well-known cryptographic algorithms, more efficiently and with remarkably fewer qubits than previous approaches. We implement simulations of our attacks for symmetric-key protocols such as S-DES, S-AES and Blowfish. For instance, we show how our attack allows a classical simulation of a small 8-qubit quantum computer to find the secret key of one 32-bit Blowfish instance with 24 times fewer number of iterations than a brute-force attack. Our work also shows improvements in attack success rates for lightweight ciphers such as S-DES and S-AES. Further applications beyond symmetric-key cryptography are also discussed, including asymmetric-key protocols and hash functions. In addition, we also comment on potential future improvements of our methods. Our results bring one step closer assessing the vulnerability of large-size classical cryptographic protocols with Noisy Intermediate-Scale Quantum (NISQ) devices, and set the stage for future research in quantum cybersecurity.

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