"We're going to continue to phase it in until we're confident that the site can handle, you know, the full capacity," McKee said.
The process could take a "week or two" for all existing customers to be back in the portal, according to Brian Tardiff, the state's digital officer.
Tardiff said bringing RIBridges back online follows "multiple rounds of performance, functionality and security testing of the RIBridges systems and implementation of enhanced security monitoring to ensure a secure and stable relaunch."
"Our third party vendor has provided attestation that the system is secure and free from malicious files," he said.
Existing or prospective customers who do not have an online account will not be able to create one for the time being, however, according to officials.
Since Dec. 13, RIBridges has been unavailable, leaving customers who require public benefits such as Medicaid, food stamps, and health insurance from HealthSourceRI, the state's healthcare exchange, to sign up for benefits in person, through the mail, or over the phone.
The impact of the data breach has been broad: About 657,000 people had personal information potentially compromised, including, possibly, Social Security numbers, names, addresses, dates of birth, and health details.
Hackers with the group, Brain Cipher, which claimed responsibility for the attack, later leaked at least some of the stolen information on the dark web.
Deloittec, the state's vendor who oversees RIBridges, as well as a third-party company, have been assessing the data. Tardiff said Wednesday the review is roughly "two-thirds" completed.
"Our third party vendor is also working to finalize the incident report, which we anticipate will be delivered to us in the coming weeks," he said.
McKee and other leaders have frequently urged the public to take steps to safeguard their personal data. Those who have been swept up in the fallout of the attack have been sent letters, and can sign up for five years of credit monitoring and identify theft insurance, officials have said.