Google Ads Will Now Use A Trusted Execution Environment By Default | AdExchanger
Briefly

"Confidential matching uses a TEE built on Google Cloud infrastructure to create an isolated computing environment for ad targeting and measurement."
"You have an encryption key that is owned by the advertiser, so no one, especially the infrastructure provider or Google Ads, has access to any of the data," Janardhan said.
Read at AdExchanger
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