pseudorandom sequence
Computing term for a sequence of numbers that appears random but is generated by a deterministic algorithm.
This cryptographic system generates keys using a pseudorandom sequence.
乱数 refers to random numbers in general, while 近似ランダム系列 specifically denotes a pseudorandom sequence, often used in computing contexts.
Compound of 近似 (approximation) + ランダム (random) + 系列 (sequence). A calque of English 'pseudorandom sequence'.