https://andyzhu23.github.io/blog Notes on cryptography, algorithms, math, and other things I find interesting. en Thu, 11 Jun 2026 21:03:14 GMT https://andyzhu23.github.io/blog/cambridge-undergrad https://andyzhu23.github.io/blog/cambridge-undergrad Thu, 11 Jun 2026 12:00:00 GMT A reflection on my undergraduate experience reading the Computer Science Tripos at Cambridge. cambridge university reflection https://andyzhu23.github.io/blog/discrete-fourier-transform https://andyzhu23.github.io/blog/discrete-fourier-transform Mon, 27 Apr 2026 12:00:00 GMT 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. math algorithms signal-processing https://andyzhu23.github.io/blog/elliptic-curve-on-my-homepage https://andyzhu23.github.io/blog/elliptic-curve-on-my-homepage Fri, 24 Apr 2026 12:00:00 GMT What the animated curve behind every page is actually computing — and why the same operation secures half the internet. cryptography math canvas https://andyzhu23.github.io/blog/fri-low-degree-test https://andyzhu23.github.io/blog/fri-low-degree-test Fri, 24 Apr 2026 12:00:00 GMT 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. cryptography math zk-proofs