2024-10-01

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https://dotat.at/@/2024-10-01-getentropy.html

A couple of notable things have happened in recent months:

UUID v4 and v7 are great examples of the need for high performance secure random numbers: you don't want the performance of your database inserts to be limited by your random number generator! Another example is DNS source port and query ID randomization which help protect DNS resolvers against forged answers.

I was inspired to play with getentropy() by a blog post about getting a few secure random bytes in PostgreSQL without pgcrypto: it struck me that PostgreSQL doesn't use getentropy(), and I thought it might be fun (and possibly even useful!) to add support for it.

I learned a few things along the way!

Read more... )

July 2025

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