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The Sophie Germain Prime Project: A Database for Special Primes

2025-06-11

The Sophie Germain Prime Project is a database dedicated to collecting, analyzing, and distributing Sophie Germain primes. These special primes p satisfy the condition that 2p + 1 is also prime (a safe prime). The project also categorizes safe primes ((p-1)/2 is also prime) and Blum primes (p ≡ 3 (mod 4)). Sophie Germain primes are widely used in public-key cryptography and primality testing. Maintained by Kamila Szewczyk, it supports research into algorithms like the Blum-Blum-Shub random number generator. An API allows users to submit and query primes, but rate limits apply.

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Why C for Codec Implementation?

2025-03-08
Why C for Codec Implementation?

This blog post explores the author's choice of C over Rust for implementing codecs. While Rust offers a powerful type system and memory safety features, these benefits come at a performance cost in low-level, performance-critical code like codecs. The author argues that C's simplicity and direct control over hardware make it better suited for high-performance codec development. Examples from PAQ8, bzip3, and LZ4 implementations highlight memory management and performance optimization challenges. The author finds low-level optimization easier in C. While Rust's safety is advantageous, the overhead is unacceptable in performance-demanding scenarios.

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