Tootfinder

Big Varchenko-Gelfand rings and orbit harmonics
Brendon Rhoades
https://arxiv.org/abs/2508.18602 https://arxiv.org/pdf/2508.18602

Big Varchenko-Gelfand rings and orbit harmonics
Let $\mathscr{M}$ be a conditional oriented matroid. We define a graded algebra $\widehat{\mathscr{VG}}_\mathscr{M}$ with vector space dimension given by the number of covectors in $\mathscr{M}$ which admits a distinguished filtration indexed by the poset $\mathscr{L}(\mathscr{M})$ of flats of $\mathscr{M}$. The subquotients of this filtration are isomorphic to graded Varchenko-Gelfand rings of contractions of $\mathscr{M}$, so we call $\widehat{\mathscr{VG}}_\mathscr{M}$ the {\em graded big Va…

RE: https://infosec.exchange/@metacurity/115264844196243324
My guess is that most folks read articles about that Secret Service SIM farm bust that were misleading at best. Today's Metacurity explains why.

Derived equivalences of DG algebras are not governed by their cohomology rings
X. -F. Mao, R. -K. Lu
https://arxiv.org/abs/2508.17574 https://arxiv.org/pdf…

Derived equivalences of DG algebras are not governed by their cohomology rings
Let $\mathscr{A}$ and $\mathscr{B}$ be two connected cochain DG algebra such that $\mathscr{A}^{\#}=\mathscr{B}^{\#}$ and the cohomology rings $H(\mathscr{A})$ and $H(\mathscr{B})$ are isomorphic. We give examples to show that $\mathscr{A}$ and $\mathscr{B}$ are not necessarily derived equivalent, thereby answering to a question of Dugas.

I love that this accidental shot emerged, well by accident, in #midjourney. #aiphotography
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RE: https://infosec.exchange/@metacurity/115265902778144828
Now CISA has issued an emergency directive. This must be a pretty big deal.

RE: https://infosec.exchange/@metacurity/115265893877113375
The NCSC just issued a warning about this.
NCSC warns of persistent malware campaign targeting Cisco devices

Each week, Metacurity offers our free and paid subscribers a digest of the best long-form (and longish) infosec-related pieces we couldn't properly fit into our daily news crush.
This week's selection covers
--N. Korea's IT worker scheme ensnared a troubled woman,
--Iran is harvesting millions of airline passengers' data,
--Myanmar is isolated in its digital tyranny,
--Pushing the UK to abandon its encryption backdoor,
--The racist hacker …

Best infosec-related long reads for the week of 7/19/25
N. Korea's IT worker scheme ensnared a troubled woman, Iran is harvesting millions of airline passengers' data, Myanmar is isolated in its digital tyranny, Pushing the UK to abandon its encryption backdoor, The racist hacker attacking universities, Making quantum cryptography stronger

Don't leave for the weekend without checking out today's Metacurity for the most critical infosec developments you should know, including
--CISA orders agencies to fix Cisco firewall zero day flaws by noon today,
--Microsoft terminates Israeli military access to surveillance system,
--Senate report documents DOGE's marauding ways,
--Dutch cops bust two teens for wi-fi sniffing,
--Hackers stole pics and info on 8,000 nursery school kids,
--Edge d…

CISA orders agencies to fix Cisco firewall zero day flaws by noon today
Microsoft terminates Israeli military access to surveillance system, Senate report documents DOGE's marauding ways, Dutch cops bust two teens for wi-fi sniffing, Hackers stole pics and info on 8,000 nursery school kids, Edge device-focused threat group RedNovember is aligned with China, much more

It's Friday and don't stop work for the weekend before you check out today's Metacurity for the most critical infosec developments you should know, including
--Cyber incident disrupts Hawaiian Airlines, but flights are unaffected
--Food distributor UNFI restores operations,
--Danish gov't wants people to own copyrights to their bodies, faces and voices,
--N. Korea is automating crypto theft with AI tools,
--Pro-Iranian hacktivists leaked Saudi Ga…

Cyber incident disrupts Hawaiian Airlines, but flights are unaffected
Food distributor UNFI restores operations, Danish gov't wants people to own copyrights to their bodies, faces and voices, N. Korea is automating crypto theft with AI tools, Pro-Iranian hacktivists leaked Saudi Games records, Cambodia has been negligent in cybercrime compound crackdowns, much more

Don't leave for the weekend before you check out today's Metacurity for the most crucial infosec developments you should know, including
--Operation Checkmate seized the sites of BlackSuit ransomware operation,
--US sanctions three DPRK officials involved in worker schemes,
--AZ woman sentenced to 8 years for hosting DPRK laptop farm,
--Plankey promises to pitch for more CISA funding,
--UK student sentenced to 7 years for distributing phishing kits,

Operation Checkmate seized the BlackSuit ransomware sites
US sanctions three DPRK officials involved in worker schemes, AZ woman sentenced to 8+ years for hosting DPRK laptop farm, Plankey promises to pitch for more CISA funding, UK student sentenced to 7 years for distributing phishing kits, Hackers stole info from CIA spy satellite arm, much more