obliv.log https://personal-blog-red-ten.vercel.app Notes on private information retrieval, lattice cryptography, and protocols that forget what you asked for. en Why every PIR scheme has to touch every record https://personal-blog-red-ten.vercel.app/posts/pir-must-touch-every-record https://personal-blog-red-ten.vercel.app/posts/pir-must-touch-every-record Tue, 14 Jul 2026 00:00:00 GMT A server that skips a row has already told you something. Working through the lower bound from first principles, and why it shapes every practical design. SimplePIR, and what a preprocessed hint really costs https://personal-blog-red-ten.vercel.app/posts/simplepir-hint-cost https://personal-blog-red-ten.vercel.app/posts/simplepir-hint-cost Sun, 28 Jun 2026 00:00:00 GMT Throughput looks excellent until you account for the client-side state. Measuring where the hint stops being worth it. Noise growth in RLWE is a budget you spend once https://personal-blog-red-ten.vercel.app/posts/rlwe-noise-budget https://personal-blog-red-ten.vercel.app/posts/rlwe-noise-budget Tue, 09 Jun 2026 00:00:00 GMT Every homomorphic operation draws down the same account. A practical way to reason about depth before you write any code.