Google DeepMind’s AI Agents Make 1024-Bit RSA Keys Cheaper to Attack
Google DeepMind says AI agents working under human supervision have found two ways to reduce the cost of attacking 1024-bit RSA cryptosystems.
The research, conducted with cryptographers from UC San Diego and Inria, indicates that attacks on legacy RSA-1024 require less computation than previously assumed.
“In practice, these results only affect obsolete 1024-bit RSA systems, and modern encryption protocols, which almost universally use 2048-bit or larger keys, remain secure,” said Pushmeet Kohli, VP at Google DeepMind and chief scientist at Google Cloud.
The first finding involves digital signatures and padding, the preset data that many signature standards add to a message to bring it to a fixed block size. Padding was known to make forgery harder, but its value against an attacker who can choose what gets signed was unclear.
DeepMind determined that it depends on the share of the signed block the attacker controls. “Once they control roughly half...
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