The 6 Best USB Data Blockers To Prevent Hackers From Juice Jacking Your Files

Did you know that hackers can access your smartphone through a USB cable when you plug it in to charge? This practice is called “juice jacking” and your phone’s data is at risk unless you attach USB data blockers to your charging cable. Here’s more info on juice jacking and ways you can protect yourself for when you eventually need to plug in and recharge your smartphone.

How Juice Jacking Works

How are hackers able to gain access to your phone? They can either infect your phone with malware through the USB port, or download the contents of your phone directly to their computer. So, when you unsuspectingly connect your smartphone’s USB cable to a juice jacking station, you are unintentionally granting access to the entire contents of your phone to a hacker.

That’s right, while you’re charging, they are injecting malware and/or downloading your phone’s data. 

Just start to think about all the risky places that you have plugged your phone into to charge over the years, like coffee shops, rental cars, and airport terminals. Pretty scary, right?

Luckily, there is a way to block these attacks using a device called a USB data blocker.

How Do USB Data Blockers Prevent Juice Jacking?

How do USB data blockers work? USB data blockers disable the data pins in USB cables but still enable charging power to reach your phone. Without the ability to transfer data through the charging cable, hackers can’t juice jack your phone. USB blockers are essentially a USB condom. 

The biggest downside to USB data blockers is the electricity that your phone charges through the cable will be reduced. But sacrificing slower charging speeds for better security is worth the extra peace of mind.

What Are The Best USB Data Blockers (aka USB Condoms)?

Are all USB data blockers created equal? They essentially all do the same thing, block data, but each device has its own unique set of features. Here are our top recommendations:

PortaPow USB Data Blockers (USB-A)

PortaPow is probably the most well-known brand name in USB data blocking security. Not only did PortaPow invent the first data blocker device in 2013, but they offer a guarantee, making them the preferred choice by many government officials in the USA, Canada, New Zealand and UK.

In addition to blocking all data from reaching your phone, the PortaPow has an internal Smartcharge chip that can identify if your device is an iPhone or Android, and optimize the power flow accordingly.

• TLDR: Optimized charging power flow for either iPhone or Android devices using a USB-A cable
• Price: $11.99 for a 2-pack (via Amazon)
• Colors: Red, white
• Cable Type: USB-A
• Connector Gender: Male-to-Female
• Compatible Devices: Smartphones, Tablets

PortaPow USB Data Blocker (USB-C)

If you want PortaPow protection but have a USB-C device, then you’ll want to get the PortaPow USB-C Data Blocker. You can charge your phone through this cable but not your computer. Most laptops require a data signal to allow charging.

• TLDR: If your phone has a USB-C cable, then you’ll want to use this model. 
• Price: $6.99 (via Amazon)
• Color: Black and red
• Cable Type: USB-C
• Cable Length: 15cm (6 inch) length
• Connector Gender: Male-to-female
• Compatible Devices: Smartphones, Tablets

USKYT USB Data Blockers

If you need to buy USB data blockers for your family, or a small group of coworkers, then this is your best deal. You can get a (5) pack of USKYT data blockers for under $10. Hope you like the color red.

These USKYT data blockers not only protect you from juice jacking, but they automatically switch between Apple, Universal and Samsung charging standards to charge your device with up to 2.4A power.

• TLDR: Amazon’s Choice, cheap.
• Price: $9.99 for five (via Amazon)
• Material: Metal aluminum alloy
• Color: Red
• Cable Type: USB-A
• Connector Gender: Male-to-female

ChargeDefense Data Blocker

If you are buying data blockers for everyone in your company, then this will make you happy. The ChargeDefense Data Blocker is sold in bulk, and you can buy a pack of 120 data blockers for only $249. That breaks down to only $2 per data blocker. And supposedly, the ChargeDefense Data Blocker is standard issue for White House employees.

• TLDR: Sold in bulk. Trusted by White House IT teams.
• Price: $13.95 for a five pack (via Amazon) or $249 for a jumbo pack of 120 (via Amazon)
• Material: Plastic
• Color: Grey
• Cable Type: USB-A
• Charging Power: USB 2.0
• Connector Gender: Male-to-female

OffGrid USB Data Blockers By EDEC

The EDEC OffGrid has a silver metal exterior and ABS plastic interior make for a lightweight yet sturdy design. If silver and metal is more your style than cheap plastic, then this is the data blocker for you. However, some users on Amazon report that the outer metal edges were a little sharp.

• TLDR: Silver is pretty.
• Price: $7.00 or $13.00 for a 2-pack (via Amazon)
• Color: Silver
• Cable Type: USB-A
• Connector Gender: Male-to-female

USB Defender Data Blocker

Like the other USB data blockers on this list, the USB Defender will help protect your files from being accessed by juice jacking hackers. But I like how the “USB Defender” logo is printed on the outside of the device. It’s easy to identify when sorting through your bags of gear.

However, the USB Defender is very pricey compared to the other USB data blockers on this list.

• TLDR: Easy to find in your bag of stuff. Pricy.
• Price: $12.99 each (via Amazon)
• Color: White
• Cable Type: USB-A
• Connector Gender: Male-to-female

Alternative Uses For Blocking USB Data Communications

USB data blockers aren’t just used to block hacking attempts. If you want to charge your smartphone, but not have it communicate with other devices like your stereo, boat or car, then you can use a data blocker.

Why? Many gadgets with USB connectivity, including the iPhone, iPod or GPS navigators, begin chattering through the USB cable as soon as you plug them in. 

For example, I have two USB ports in my Subaru Ascent. But if two people plug their smartphones in to my car at the same time, the car stereo confused and doesn’t know which phone to use for CarPlay connectivity. So I added a USB data blocker to one of the cables. 

How To Idenity Suspicious Juice Jacking Operations

Never, ever, ever plug your phone into charge at a public place like a convention center, airport, coffee shop, charging kiosk, or even an Uber car. There’s no way what’s on the other side of that USB port. 

And be especially wary of plugging into a charging bank that might even remotely look like it could be connected to a computer. 

I used to do a lot of international travel for work and remember a very sketchy USB charging station at a coffee shop in Paris. Inside the cafe, there was a sit down area with bar and stools by the window with female USB cables hanging out of a wooden box. The owner told me that I could drink my coffee and charge my phone by the window multiple times.

But I saw something that made me unconfortable. With my eyes, I followed a USB wire from the hub to a computer plugged into a laptop behind the counter. Was the owner hacking customer phones, or just using his laptop to provide power to his customers? I didn’t plan to find out and politely declined his offer.

The Best Way To Prevent Juice Jacking Is……

If you travel a lot, then you’ve probably been in a situation where your smartphone is about to die at the worst possible time. Like when you’re going through security and need to scan your mobile boarding pass. But no matter how dire the situation, you should always first evaluate the risks of an unsecured charging opportunity. It’s better to be safe, than sorry.

USB data blockers are a must-have gadget for anyone who does a lot of remote work or traveling. You never know when you might need to plug in to keep your device charged. But the best way to prevent juice jacking is to bring your own chargers and plug them directly into an electrical outlet, or portable battery pack.

Here are some portable travel batteries that can keep your phone charged on the go.

1. Anker PowerCore 10000 Portable Charger ($24)
2. Mophie Juice Pack Air ($30+)
3. Miady portable chargers ($20+)