A Defensive Computing Checklist    by Michael Horowitz
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TRAVELING

TOPICS BELOW
Booking, Before Leaving, Password Manager, Flying, Travel eSIMs, Cellphones and Privacy, Assorted Articles

Beware of these bad things about Airbnb.

BOOKING

BEFORE LEAVING   top

PASSWORD MANAGER   top

I am not a big fan of password managers, but I do believe they can offer excellent Defensive Computing when traveling.

First off, I suggest using a password manager that supports more than one Operating System for maximum flexibility. Many do.

I suggest creating three different databases within your password manager. I would keep these databases both on your phone and also stored somewhere in the cloud. The databases will be encrypted, but even so, I would store them with a cloud service that offers secure file storage.

To be clear, this is my suggestion, I have not seen it anywhere else.

  1. The first database should be for your credit cards. Take a picture of the front and back of all the credit cards you travel with. This way, if they are lost or stolen you have everything you need to report them as lost to the credit card company.
  2. The second database is for your identity, so that you can prove who you are, if need be. At the least, this database should have pictures of the front and back of your Drivers License and Passport. Not long ago, it would have also needed proof of COVID-19 vaccination. If you are a student, include your student ID card.
  3. The third database is for whatever insurance cards you have that prove you have medical insurance. Maybe Dental insurance too. Again, photos of the front and back.

Why three databases? For one thing, each database file can get big if the photos are high quality, especially if you do this for every member of your family. Password managers are mostly designed to hold plain text so there may be a maximum database size that it's best to avoid. Also, no need to put all your eggs in one basket.

FLYING   top

Don't fly on any plane made by Boeing. More on this below.

TRAVEL ESIMS   top

Using an eSIM while traveling requires a phone that is both unlocked and compatible with eSIMS. You can have two SIMs active on an iPhone at once.

CELLPHONES and PRIVACY   top

It is not unusual for a border guard to require an inspection of your phone before you are allowed into a country. In August 2025, Steve Gibson addressed this in his Security Now! podcast, saying: "... the idea would be to pick up a Samsung Galaxy 15 for $40 as I recently did when I wanted to experiment with inexpensive biometric authentication, use it for a few weeks before traveling and take it with you, leaving your fully history-laden real phone at home. It’s safer in case anything should happen to your inexpensive throwaway during your travels, and you can unlock it happily for any authority who might wish to see what you’ve been getting up to recently."

ASSORTED ARTICLES   top

See also the Airbnb topic.

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