As vaccination rates for COVID-19 increase, so will the number of people traveling internationally. To limit the spread of the virus, more countries may require proof of vaccination for entry. This is where vaccine passports come in. While portable vaccination records have long been used to prove immunization, governments and airlines are now starting to experiment with electronic certificates. These could be in the form of a QR code on a mobile device and can be easily scanned to check a person’s vaccination status. Officials now predict that vaccine verifications will become commonplace for…