Andy Zhu's blog https://andyzhu23.github.io/ 2026-06-11T12:00:00.000Z Andy Zhu Notes on cryptography, algorithms, math, and other things I find interesting. Three years at Cambridge: what I learned reading the Computer Science Tripos https://andyzhu23.github.io/blog/cambridge-undergrad 2026-06-11T12:00:00.000Z 2026-06-11T12:00:00.000Z A reflection on my undergraduate experience reading the Computer Science Tripos at Cambridge. The Discrete Fourier Transform https://andyzhu23.github.io/blog/discrete-fourier-transform 2026-04-27T12:00:00.000Z 2026-04-27T12:00:00.000Z From continuous frequencies to roots of unity — how the DFT, FFT, and NTT turn O(n²) convolutions into O(n log n), with applications in competitive programming and the real world. The elliptic curve on my homepage, demystified https://andyzhu23.github.io/blog/elliptic-curve-on-my-homepage 2026-04-24T12:00:00.000Z 2026-04-24T12:00:00.000Z What the animated curve behind every page is actually computing — and why the same operation secures half the internet. FRI: fast low-degree testing by recursive folding https://andyzhu23.github.io/blog/fri-low-degree-test 2026-04-24T12:00:00.000Z 2026-04-24T12:00:00.000Z How a clever split of a polynomial into its even and odd parts lets a verifier check degree in logarithmic queries — the recursive trick behind modern STARKs.