This approach can be constructed in many variants. For example, with some simple tweaks, can build credentials that only permit the User to employ the credential a limited number of times in any given time period: for example, at most 100 times per day.4 This requires us to simply change the inputs to the PRF function, so that they include a time period (for example, the date) as well as a counter. These techniques are described in a great paper whose title I’ve stolen for this section.
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Материалы по теме:
Lecture 19: Variance Reduction (CMU 15-462/662) An overview various variance reduction techniques for Monte Carlo rendering, covering bidirectional path tracing, Metropolis-Hastings algorithm, MIS, stratified Sampling, low-discrepancy sampling, blue noise, photon mapping, and finite element radiosity
Addition uses Kogge-Stone carry-lookahead. Multiplication uses a learned byte-pair lookup table.