Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2025/04/cell-phone-opsec-for-border-crossings.html
I have heard stories of more aggressive interrogation of electronic devices at US border crossings. I know a lot about securing computers, but very little about securing phones.
Are there easy ways to delete data—files, photos, etc.—on phones so it can’t be recovered? Does resetting a phone to factory defaults erase data, or is it still recoverable? That is, does the reset erase the old encryption key, or just sever the password that access that key? When the phone is rebooted, are deleted files still available?
We need answers for both iPhones and Android phones. And it’s not just the US; the world is going to become a more dangerous place to oppose state power.
Post Syndicated from Bruce Schneier original https://www.schneier.com/blog/archives/2022/09/large-scale-collection-of-cell-phone-data-at-us-borders.html
The Washington Post is reporting that the US Customs and Border Protection agency is seizing and copying cell phone, tablet, and computer data from “as many as” 10,000 phones per year, including an unspecified number of American citizens. This is done without a warrant, because “…courts have long granted an exception to border authorities, allowing them to search people’s devices without a warrant or suspicion of a crime.”
CBP’s inspection of people’s phones, laptops, tablets and other electronic devices as they enter the country has long been a controversial practice that the agency has defended as a low-impact way to pursue possible security threats and determine an individual’s “intentions upon entry” into the U.S. But the revelation that thousands of agents have access to a searchable database without public oversight is a new development in what privacy advocates and some lawmakers warn could be an infringement of Americans’ Fourth Amendment rights against unreasonable searches and seizures.
[…]
CBP conducted roughly 37,000 searches of travelers’ devices in the 12 months ending in October 2021, according to agency data, and more than 179 million people traveled that year through U.S. ports of entry.
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