Hymenaea courbaril plasters, but at present its only use is for incense and varnish. The wood is very hard, measuring 5.6 on the Brinell scale and on the Janka scale, approximate measurements of hardness. For comparison, Douglas fir measures , white oak , and Brazilian walnut on the Janka scale. It features a tan to salmon color with black accent stripes that over time turn to a deep and vibrant red. Attribution: Hymenaea courbaril Hymenaea courbaril (courbaril and West Indian locust) is a tree common in the Caribbean, Central America, and South America. It is a hardwood that is used for furniture,
Computational hardness assumption an average-case hardness assumption is stronger than a worst-case hardness assumption for the same problem. Furthermore, even for incomparable problems, an assumption like the Exponential Time Hypothesis is often considered preferable to an average-case assumption like the planted clique conjecture. Note, however, that in most cryptographic applications, knowing that a problem has some hard instance (i.e. a problem is hard on the worst-case) is useless because it does not provide us with a way of generating hard instances. Fortunately, many average-case assumptions used in cryptography (including RSA, discrete log, and some lattice problems) can be based on worst-case assumptions via