With so much attention and hope given to so-called ‘vaccine passports’ as the best way to ensure a resumption of safe and secure international travel, the fact remains that issuing vaccine passports is far more complicated than it might appear. Such a document would need many interlocking, secure parts, even if the aim is, ideally, to keep the technology as simple as possible, both in use and design; provide some alternative for those who do not have smartphones; and have security, data protection and data privacy as a foundational principle.
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