Estonia is to block thousands of citizens from access to public services online by Saturday, while working to resolve a security flaw.
A problem with the identity card was identified at the beginning of this year, affecting 760,000 people.
The flaw could allow attackers to decrypt the private data, or represent the citizens.
Those who have not had their cards updated with new security certificates will no longer be able to access some of the services, starting from midnight.
Estonia’s digital ID system that allows citizens to access government and some private services, such as medical records, the right to vote and bank.
But yet, the researchers found the encryption system used the ID card, and it can break easily, which, if exploited, allow attackers to impersonate people.
“As far as we currently know, there has not been any instances of e-identity theft, but the assessment of the threat of the Police and Border guard Board and the information System of the Authorities indicates that this threat has become real,” said the Prime Minister Juri Rata.
By midnight, only the cards that have been updated will continue to work online.
Some citizens had complained that the update, their identity card had taken a long period of time, with the online service often overloaded.
“Spent hours over the course of two days trying to update my identity card for govt/MFA instructions. Still trying…,” said Theresa Bubbear, great Britain, ambassador of Estonia, on Thursday.
This weekend, only “the people that use their digital id cards to provide vital services”, as the doctors will be able to update their digital ID online.
By Monday, the system will be opened up to all. All cards must be upgraded to March 2018.
“The operation of an and-state is based on the trust and the state cannot afford identity theft happens at the owner of an Estonian identity card,” said Mr Rata.