technology
technology writing on leonacosta - essays, notes and ideas by Leon Acosta, one idea per post.
crypto-agility.json: a place to publish cryptographic posture
why i proposed a discoverable crypto-agility manifest, what the latest revision separates, and where the IETF draft stands
oct 11, 2026
Deadline aware hybrid optimization for ISP traffic engineering
Can quantum optimization improve routing before its answer expires? A research preprint with conditional proofs, resource estimates and reproducible code.
oct 11, 2026
making post-quantum signatures faster
why I tested six signature libraries, how I checked speed and memory tradeoffs, and the patches and public reports that came out of it
oct 12, 2026
nostr is centralizing. by design
every centralization point was a rational response to a missing tool. each solved problem removed the pressure to build what would have prevented the next one
mar 5, 2026
my post-quantum proposals for Nostr
seven related drafts on keys, encrypted messages, signer capabilities and relay migration, with their dates and implementation boundaries
aug 17, 2026
post-quantum authentication in Prague
notes from the IAB workshop in Prague on Merkle Tree Certificates, HSMs and the infrastructure needed to migrate authentication
oct 12, 2026
social networks and custody mismatch
why the social graph should be infrastructure, and what it costs when it isn't
mar 11, 2026
the immutable and the exposed: bitcoin protects its past, nostr cannot
bitcoin and nostr will feel the same quantum blow, but it lands in opposite places. one you can defend, the other has already been harvested
jun 3, 2026
why i built pqc-tools
turning post-quantum research into open tools for cryptographic discovery, migration planning and repeatable checks
jun 9, 2026
why i started QuantaKrypto
twelve years in blockchain and cryptographic systems, a decision to close my business, and the research that led me to post-quantum security
jun 3, 2026
window.nostr.wot: a shared Web of Trust for browser apps
my February proposal for a browser extension API that lets Nostr apps query a user-controlled social graph
feb 24, 2026