Life & fun · February 11, 2022
MemSafeCrypto, Java cryptography primitives using DirectByteBuffer
In plain words
MemSafeCrypto is a Java library that provides cryptography primitives built with DirectByteBuffer for memory-safe operations. It's designed for developers who need to implement cryptographic functions in Java while minimizing exposure of sensitive data in memory. The library's use of DirectByteBuffer allows it to manage cryptographic keys and data outside the garbage-collected heap, reducing the risk of sensitive information lingering in memory.
written from the facts on this page · September 2026
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Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…
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