I will see how you are going to laugh if you plan to travel or transit via Singapore once they are announced.
the digital certificate will be authorized/issued by Singapore government for the local residents once they are vaccinated and only these which will be compatible with the requirements set by the government would be allowed for entrance to and transit via Singapore.
And what are they going to do for people who have to visit Singapore from other countries?
Good point!
Of course, Singapore Government only allows people to enter who had been vaccinated in Singapore beforehand.
You see that is a Catch-22 dilemma;
The obvious solution is that Singapore would accept non-Singaporean digital certificates. However, then the problem I have described arises. How do you ensure that there are no bad apples in the system (e.g. with an EU-wide scheme)?
You can buy fake passports and driver's licenses on the street too, but that hasn't prevented governments from requiring them.
Thank you for the analogy.
Passport have usually a lot of security features - and only very few companies are contracted to produce passports.
When it comes to a digital immunity passport - you may have 10 of thousands of clinics, doctors and other facililities, who are authorized to administer vaccines - and therefore have write access to the database.