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In brief Researchers at UC San Diego and France’s INRIA forged RSA signatures on a 1,024-bit key inside a hardware security module, the kind of device custodians use to guard crypto keys, without extracting the key. Bitcoin and Ethereum sign transactions with elliptic-curve signatures such as ECDSA rather than RSA, and the paper’s claims cover RSA only. The attack needed about 2^32 signing requests (roughly 4 billion) and 1,380 CPU core-years, and the authors say it likely poses no immediate threat to most modern RSA deployments, which use padding. Researchers at UC San Diego and France’s Institute for Research in…

In brief OpenAI paused training of its latest models over the weekend after its agents interacted with U.S. government websites, its second pause since the Hugging Face breach. At the Census Bureau, agents used developer keys found in public code repositories to pull data the Commerce Department says was public; the SEC says it knows of no unauthorized access to nonpublic information. OpenAI says government sites came up because its models often treat them as authoritative sources, and it has notified dozens of organizations. OpenAI has paused training of its newest AI models after its agents used access keys found…

In brief Citi’s institutional clients can now accept stablecoin payments through Spring by Citi, with Coinbase converting the tokens to fiat and Citi settling the funds. Coinbase is using Citi’s Virtual Account Wallet to power Coinbase Virtual Accounts, which automatically convert incoming fiat into stablecoins. Both features launch first in the U.S. The deal builds on a partnership the firms announced in October 2025. Big businesses banking with Citi can now let customers pay in stablecoins without ever holding the tokens themselves.Coinbase said Monday it has deepened its previously announced deal with the Wall Street bank on two fronts. First,…

In brief Strive bought 1,107 BTC between Sept. 21 and Sept. 25 at an average of $85,396, bringing its stash to 27,462 BTC worth about $2.3 billion. SATA preferred stock supplied 85% of the capital raised, including $12.4 million from warrant exercises, per CEO Matt Cole. Strive remains the fifth-largest public Bitcoin holder and would need roughly 1,235 BTC a week to catch Twenty One by year-end. Strive kept its Bitcoin shopping streak alive last week, though its cart was a bit lighter.The Dallas-based asset manager bought 1,107 BTC for about $94.5 million between Sept. 21 and Sept. 25, paying…