# electromagnetic emissions

Published articles for electromagnetic emissions.

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## Leaking secrets from air-gap computers by spelling radio signals from RAM

DevFeed: [Leaking secrets from air-gap computers by spelling radio signals from RAM](<https://devfeed.tech/articles/leaking-secrets-from-air-gap-computers-by-spelling-radio-signals-from-ram-112648.md>)

Original publisher: [Read original article](<https://blog.adafruit.com/2026/11/02/leaking-secrets-from-air-gap-computers-by-spelling-radio-signals-from-ram/>)

Author: Anne Barela

Published: 2026-11-02T20:45:05Z

Content type: article

Language: en

Sources: [Adafruit Industries](<https://devfeed.tech/sources/adafruit-industries-makers-hackers-artists-designers-and-engineers.md>)

Topics: [Security](<https://devfeed.tech/topics/security.md>), [side channel](<https://devfeed.tech/topics/side-channel.md>), [Cybersecurity](<https://devfeed.tech/topics/cybersecurity.md>), [communications](<https://devfeed.tech/topics/communications.md>)

Tags: [air-gap](<https://devfeed.tech/tags/air-gap.md>), [air-gapped](<https://devfeed.tech/tags/air-gapped.md>), [arxiv](<https://devfeed.tech/tags/arxiv.md>), [computer](<https://devfeed.tech/tags/computer.md>), [computers](<https://devfeed.tech/tags/computers.md>), [data](<https://devfeed.tech/tags/data.md>), [electromagnetic-emissions](<https://devfeed.tech/tags/electromagnetic-emissions.md>), [history](<https://devfeed.tech/tags/history.md>), [idea](<https://devfeed.tech/tags/idea.md>), [industrial](<https://devfeed.tech/tags/industrial.md>), [machine](<https://devfeed.tech/tags/machine.md>), [machines](<https://devfeed.tech/tags/machines.md>), [memory](<https://devfeed.tech/tags/memory.md>), [networks](<https://devfeed.tech/tags/networks.md>), [one](<https://devfeed.tech/tags/one.md>), [paper](<https://devfeed.tech/tags/paper.md>), [radio](<https://devfeed.tech/tags/radio.md>), [ram](<https://devfeed.tech/tags/ram.md>), [reverse-engineering](<https://devfeed.tech/tags/reverse-engineering.md>), [running](<https://devfeed.tech/tags/running.md>), [science](<https://devfeed.tech/tags/science.md>), [secrets](<https://devfeed.tech/tags/secrets.md>), [software](<https://devfeed.tech/tags/software.md>), [systems](<https://devfeed.tech/tags/systems.md>), [vintage-computing](<https://devfeed.tech/tags/vintage-computing.md>)

### AI overview

The described attack turns RAM activity into a covert radio channel for removing data from an air-gapped computer. Software performs memory accesses in a controlled pattern; electromagnetic emissions from the memory bus form a signal that a nearby antenna can receive and decode, without a network connection, cable, or speaker. The excerpt says the 2024 arXiv paper covers the attack model, signal generation and modulation, data rates, distances, and defenses, but does not provide their specific details.

### Source excerpt

Air-gapped computers are machines kept off networks on purpose, the way classified systems and industrial controls often are. A 2024 paper posted to arXiv describes a way to get data off one anyway, using the computer's own RAM as a radio transmitter. The idea: software running on the isolated machine reads and writes memory in [...]