Bart Preneel

Paper 2026/486 , UGent, Belgium , COSIC, KU Leuven, Belgium , COSIC, KU Leuven, Belgium π‘ƒβ„Žπ‘œπ‘‘π‘œπ·π‘π΄ is a widely deployed perceptual hash function used for the detection of illicit content such as Child Sexual Abuse Material (CSAM). This paper presents the first mathematical description of 𝐴𝑙𝑙𝑒𝑔𝑒𝑑 π‘ƒβ„Žπ‘œπ‘‘π‘œπ·π‘π΄, a new function which has identical outputs to that of π‘ƒβ„Žπ‘œπ‘‘π‘œπ·π‘π΄ for a large database of test images.

Paper 2024/363 , KU Leuven , Nervos , KU Leuven , KU Leuven Abstract A Bitcoin miner who owns a sufficient amount of mining power can perform selfish mining to increase his relative revenue. Studies have demonstrated that the time-averaged profit of a selfish miner starts to rise once the mining difficulty level gets adjusted in favor of the attacker.

This concise article delves into the pervasive deployment of encryption across billions of devices, safeguarding our data both during communication over networks and storage within our devices. Next it discusses the strengths and weaknesses of encryption. The discussion encompasses distinctions between link encryption and end-to-end encryption, highlighting the intricacies of securely managing encryption keys.