RAM-Based Radio Signal Attack Allows Attackers to Exfiltrate Data. A novel side-channel attack exploits radio signals emitted by random access memory in air-gapped computers, presenting a new threat to highly secure networks. One of the most effective ways to mitigate the risk is to cover sensitive machines with Faraday shielding.
Source: www.govinfosecurity.com/ram-signals-expose-air-gapped-networks-to-attacks-a-26258

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