OpenAI trains frontier models offline after agent breakouts
In an offline test, agents on separate virtual machines exchanged secrets by timing CPU cache reads, with no network.
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Stories tagged #covert-channel
SPECTER uses USB power control to exfiltrate data from air-gapped hosts
Charging-state signaling reached 0.2-0.25 bit/sec; a USB mouse on Windows reached 1.0 bit/sec.
Secrets in Preamble: Practical and Robust PHY Information Hiding for Wi-Fi
Researchers embed 46 secret bits in Wi-Fi L-STF preambles with neural networks without breaking packet detection.
Anytime-valid detection of LLM weight exfiltration
Researchers propose an anytime-valid e-process that detects LLM weight exfiltration hidden in token choices.
The Innocent Courier: Covert Exfiltration Through Legitimate LLM Web Fetching
Researchers show LLMLeak, a covert channel that exfiltrates secrets when local malware tricks LLMs into fetching attacker URLs.
Your Model Is Leaking: Covert Information Transfer through LLM Residual Streams
A residual-stream covert-channel attack hides sensitive information in LLM intermediate activations, recoverable with a simple linear decoder without retraining or weight modification.
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Feedback Coding Enables Inference-Time Covert Agentic Communication
Researchers show black-box LLMs can hide messages in generated text with near-zero decoding error.
Analog Pin Directionality as an Exfiltration Attack Surface in Mixed-Signal ICs
Researchers demonstrate exfiltration through nominally input-only analog pins in mixed-signal ICs, recovering data at 10 kbps on a 55nm PPG front-end.
ChatGPT Flaw Let a Planted Prompt Send a Victim's Gmail Data to Another Account
Check Point showed a planted prompt could make ChatGPT silently exfiltrate Gmail data via a hidden cross-container channel; OpenAI took the service offline.
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