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Show HN: Why Two Identical PDFs Have Different SHA-256 Hashes (How We Fixed It)

https://docs.pdfcanon.com/blog/why-identical-pdfs-hash-differently/
1•napzoom•1h ago

Comments

ivanr•1h ago
Spoiler: They're not identical.
napzoom•1h ago
That's exactly the point - from the spec's perspective they aren't identical, but from every user's perspective they are. Same pages, same text, same rendering. The interesting question is whose definition of "identical" should govern when you're building audit trails or deduplication systems.
dlcarrier•46m ago
It bugs me when editors don't keep track of whether or not a document has been modified. If I hit save and I haven't modified it, but the editor writes a new timestamp, it is no longer accurate, because it wasn't edited at that time.

Fedora Sealed Bootable Container Images

https://www.privacyguides.org/news/2026/05/04/fedora-sealed-bootable-container-images-possibly-op...
1•Gedxx•2m ago•0 comments

Trump SEC lets Musk settle $150M Twitter lawsuit for $1.5M

https://arstechnica.com/tech-policy/2026/05/trump-sec-lets-musk-settle-150-million-twitter-lawsui...
1•AdmiralAsshat•2m ago•0 comments

Some surprising facts about nightlights data

https://www.spatialedge.co/p/some-surprising-facts-about-nightlights
1•marklit•2m ago•0 comments

Mikan: a proof assistant for cubical type theory (forked from Agda)

https://mathstodon.xyz/@jonmsterling/116522692709243649
1•baruchel•2m ago•0 comments

ProgramBench: Can Language Models Rebuild Programs from Scratch?

https://github.com/facebookresearch/ProgramBench
1•fittingopposite•3m ago•0 comments

The Pulse: 'Tokenmaxxing' as a weird new trend

https://blog.pragmaticengineer.com/the-pulse-tokenmaxxing-as-a-weird-new-trend/
1•Gedxx•3m ago•0 comments

Kagi's Orion browser hits public beta on Linux

https://www.omgubuntu.co.uk/2026/03/orion-for-linux-beta-release
1•bwoah•3m ago•1 comments

My 1B tokens/day Symphony setup

https://www.alessiofanelli.com/posts/my-1b-tokens-day-openai-symphony-setup/
1•FanaHOVA•3m ago•0 comments

Buy and Sell Monero – Cash. Crypto. P2P

https://retoswap.com
1•Cider9986•3m ago•0 comments

Deepfakes Are Coming for Your Bank Account

https://www.theatlantic.com/technology/2026/05/chatgpt-images-deepfakes-fraud/687023/
1•bookofjoe•3m ago•1 comments

Easy Random Trees

https://blog.wilsonb.com/posts/2026-02-27-easy-random-trees.html
1•aebtebeten•5m ago•1 comments

Hardware-Backed Security Using WolfTPM with SPDM

https://www.wolfssl.com/hardware-backed-security-using-wolftpm-with-spdm/
1•aidangarske•5m ago•0 comments

Ask HN: Best/Easiest way to host Rust with PostgreSQL?

2•dnh44•6m ago•0 comments

Post Office acknowledges ECCO+ user's calls for help three decades ago

https://www.computerweekly.com/news/366642657/Post-Office-acknowledges-ECCO-users-calls-for-help-...
1•latein•9m ago•0 comments

May the Focus Be with You

https://tantek.com/2026/124/b1/may-the-focus-be-with-you-iphone-grayscale
1•speckx•9m ago•0 comments

Show HN: WolfCOSE, a zero alloc C COSE with multi-sign/recipient, and PQC

https://github.com/aidangarske/wolfCOSE
1•aidangarske•10m ago•0 comments

Why airlines are always going bankrupt

https://davidoks.blog/p/why-airlines-are-always-going-bankrupt
1•bko•10m ago•1 comments

Show HN: Typesync, schema-first Firestore tooling that now validates stored data

https://github.com/kafkas/typesync
3•anarkafkas•11m ago•0 comments

GPT‑5.5 Instant

https://openai.com/index/gpt-5-5-instant/
6•meetpateltech•11m ago•0 comments

The Download: inside the Musk vs. Altman trial, and AI for democracy

https://www.technologyreview.com/2026/05/05/1136848/the-download-musk-openai-altman-trial-ai-demo...
2•joozio•11m ago•0 comments

Software Has a CAC Now

https://www.edge.ceo/p/software-has-a-cac-now
1•rwaliany•13m ago•0 comments

Single dose of psylocibin can cause anatomical brain changes, study finds

https://www.theguardian.com/science/2026/may/05/magic-mushrooms-psychedelic-changes-brain-anatomy...
4•bookofjoe•14m ago•0 comments

Mathematicians in the Age of AI

https://arxiv.org/abs/2603.03684
2•lostathome•14m ago•0 comments

Pennsylvania sues Character AI, says chatbot poses as doctors

https://www.reuters.com/legal/litigation/pennsylvania-sues-character-ai-says-chatbot-poses-doctor...
2•randycupertino•14m ago•1 comments

Spear: The Management Framework for AI

https://www.edge.ceo/p/introducing-spear-the-management
1•rwaliany•15m ago•0 comments

Alan Moore: 'The comics industry is poisonous'

https://observer.co.uk/culture/interviews/article/alan-moore-the-comics-industry-is-poisonous
2•Tomte•16m ago•0 comments

Bluesky is the new science Twitter

https://bsky.app/profile/katharinehayhoe.com/post/3merjfvirak22
1•rzk•16m ago•0 comments

Understanding the different conversational dynamics of comments sections with AI

https://opennotes.ai/blog/same-policy-three-comment-sections
2•anateus•17m ago•0 comments

Disney Debt

https://www.manton.org/2026/05/05/disney-debt.html
1•speckx•17m ago•0 comments

Kill SWITCH AGENDA: You'll own your car – until the government AI says you don't

https://www.theblaze.com/align/kill-switch-agenda-youll-own-your-car-until-the-governments-ai-say...
1•bilsbie•18m ago•1 comments