Development of a Standardized Testing Environment for QRNGs Based on Semiconductor Laser Phase Noise

Quantum random number generators QRNGs based on semiconductor laser phase noise are an inexpensive and efficient resource for true random numbers. Commercially available technology allows for designing QRNG setups tailored to specific use cases. However, it is important to constantly monitor...

TicketUtils: Number draws are not uniformly distributed

Lines of code Vulnerability details The number selection algorithm in TicketUtils.reconstructTicket "draws" winning numbers using modulo arithmetic and a random seed. However, selected numbers are not uniformly distributed. Due to modulo bias and successive draw logic, higher numbers will be draw...

Raffle is fair only if tokenRange is a power of 2.

Lines of code Vulnerability details Impact Based on the contract logic, the raffle works by sampling a value $ x \in \mathbbZ | 0 \leq x \lt 2^256 $ aka uint256 from a uniform distribution provided by Chainlink VRF, then applying modulo tokenRange, generating a new value $ y \in \mathbbZ | 0 \leq...