Observed arrival · 2026-10-11

Applicant overlap, without sharing names

private-set-intersection.xyz Visit website

Editorial interest 77/100 Selection signal · not a rating of the site

A browser-based tool for summer math programs to compare applicant lists without exchanging names.

Landing page captured for the 2026-10-11 issue.

For: Organizers coordinating applicant lists across math programs
Worth noticing: Each program's browser applies its secret key to other programs’ uploaded lists; every tab must stay awake until processing finishes.

Field notes

A participating program supplies its list, then its browser applies its key to lists uploaded by the others; processing proceeds as participants come online, so one sleeping or closed tab can stall the group. The page identifies the protocol as Diffie–Hellman private set intersection in ristretto255 and links to a PDF explanation and GitHub source; registration is currently closed.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

⊠LoginAccess appeared gated

✦PrettyNotable craft visible

◎NicheUnusually specific use

◉HumanPersonal, local, civic, or handmade

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