aiqbench analysis
Quantum cryptanalysis of LBlock and New Structure IV is a research result on reduced-round variants (8 and 9 rounds), not a break of full-strength ciphers. The reported 2¹⁶ time-complexity gain and 2¹² smaller key guess space are improvements over earlier quantum attacks, and readers should weigh them against the round counts and the paper's chosen-plaintext assumptions. The work matters mainly as a data point on how quantum algorithms may shift the security margins of lightweight block ciphers.
Researchers Cut Cipher Cracking Time with New Quantum Attacks
A single bit flipped during encryption could render sensitive data useless, but new cryptanalysis techniques are narrowing that margin for error. This work demonstrates an attack reducing time complexity on the LBlock cipher by 2¹⁶, alongside a substantial reduction in its key guess space by \(2^{12}\), improving upon existing quantum attacks against Feistel-type constructions. These advances extend current understanding of vulnerabilities as we prepare for more powerful quantum computers.
New methods of attacking cryptographic systems have been developed to address vulnerabilities exposed by advances in quantum computing; researchers from Fujian Normal University and Beijing University of Posts and Telecommunications present new quantum attacks against two Feistel-type constructions, New Structure IV and LBlock, using a chosen-plainattack approach. These attacks cover eight rounds of New Structure IV and nine rounds of LBlock, enabling key recovery on both ciphers. The work details…
Excerpt shown under the publisher's RSS terms · 70 words · full text and figures are on the publisher's site
