The EFF are huge proponents of full-disk encryption with strong cryptography on every device you own. This is especially true if you’re concerned about having your mobile device seized at the border. A government forensics expert can easily crack any password or bypass it altogether (for example, by booting the system from a CD or USB device.) Full-disk encryption with a strong passphrase ensures that border agents can only enter your device with your consent. It also protects your data if your device is lost or stolen.
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