The Information Communication Technology (ICT) division's website was hacked yesterday and it was down for three hours before access to it could be restored.
“We've successfully recovered the website around three hours after the hacking. Hackers could not do any harm to the website,” claimed Subir Kishore Choudhury, acting secretary of the ICT division.
He told The Daily Star that the hackers were yet to be identified. “We'll strengthen other websites soon.”
The ICT division acting secretary said they would have to start a process to monitor all government websites.
Users were unable to access the site in the afternoon. The hackers wrote: “Hacked by Rahu. Did it for India. Your website is owned by us”.
Sources said the ICT division discovered the hack around 2:00pm and was able to restore the site after 5:30pm.
A top official of the ICT division said some Bangladeshi hackers on Friday hacked some Indian websites and this could be a repercussion. The official said, “We need to prepare for some more cyber attacks.”
The government and its offices across the country have more than 25,000 websites and ICT division is the host of these websites, including the ministries and divisions.
"This means all the information preserved in the websites were accessible to the hackers," said an official of the division, adding that the authorities should carry out a thorough probe into the hacking.
Cyber security expert Tanvir Hasan Zoha said the hacker's claim of being an Indian could be a trick.
"The hacker could even be a Bangladeshi making claims to confuse the investigators," Tanvir, who once worked for ICT division, told The Daily Star.
"What is more worrying is that the hacker might have inserted a malware in the host server or server of the ICT division. If so, it will keep sending information from the websites to the hacker even after ICT division took control of its domain," he said.
Sources said some websites were hacked earlier and in most of those cases the hackers claimed that they did it from India.
The ICT division also experienced a similar hacking incidence in July 2015.