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While security is important at home and in the office, it's when you're out and about that things can really get dangerous.
The best way I've found to stay safe is to carry with me the few things that will protect me against hackers and attacks. These are simple tools, and even if you have to buy them all, they will cost you less than $200.
It protects against unwanted data transfers from your devices while you're charging them. It basically cuts off the data side of things, and only allows power to flow to the device.
Why do you need it?
How do you know you can trust that cable or charger you're using? Hackers can use modified hardware to hack your devices and steal data or infect your device with malware.
Think you could spot malicious hardware? Think again!
Take a look at the white cable in this smaller picture. Looks innocent, doesn't it? It's not! It's an O.MG Cable by Hak5, and this can be used to attack smartphones, tablets, laptops, and desktop systems.
Instead of checking all cables you plug your devices into, plugging in via a data blocker puts a safety air gap between you and malicious devices such as the O.MG Cable. I highly recommend using a data blocker if you use chargers and cables when out and about to protect your devices.
There is a downside to USB data blockers, and that is that they block fast charging, because those fast charging protocols communicate data in order to negotiate the best charging speeds. Still, I'd rather slower charging than being hacked.
A USB security key is a device that allows websites and apps to confirm that you are indeed you, and it forms an extra line of defense between hackers and your data. Think of it as a physical password that you plug into a device (or tap on it -- as some security keys also make use of NFC) to gain access. I recommend a YubiKey.
There are times when you need to move data about with you, and using a hardware-based encrypted USB flash drive means that your data is fully protected at all times. This means that if you lose your USB flash drive, yes, you're still down the cost of the drive, but you can be confident that the data stored on the drive is locked away forever.
If you're ultra-paranoid, you can even set a USB flash drive like the Apricorn Aegis above to wipe the data after 10 incorrect passcode attempts.